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  • 1. Riazoshams, Hossein
    et al.
    Midi, Habshah
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Robust Nonlinear Regression: With Application Using R2018Book (Refereed)
    Abstract [en]

    Robust Nonlinear Regression: with Applications using R develops new methods in robust nonlinear regression and implements a set of objects and functions in S-language, under SPLUS and R software. The software covers a wide range of robust nonlinear fitting and inferences, and is designed to provide facilities for computer users to define their own nonlinear models as an object, and fit models using classic and robust methods as well as detect outliers. The implemented objects and functions can be applied by both practitioners and researchers.

    The main areas that will be covered in the book include theories and application of Nonlinear Robust Regression. In both parts the classic and robust aspects of nonlinear regression will be discussed. Outlier effects is among the main focus in the book.

  • 2.
    Peristera, Paraskevi
    et al.
    Stockholm University, Faculty of Social Sciences, Stress Research Institute.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Another Look at the Relationship between Cohabitation and Marriage: The Use of Crude and Net Probabilities2017In: Bulletin of Sociological Methodology, ISSN 0759-1063, E-ISSN 2070-2779, Vol. 136, no 1, 66-73 p.Article in journal (Refereed)
  • 3.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Environmental Recidivism in Sweden: Distributional Shape and Effects of Sanctions on Duration of Compliance2017In: Quality and quantity, ISSN 0033-5177, E-ISSN 1573-7845, , 21 p.Article in journal (Refereed)
    Abstract [en]

    The study examines the association between the size of previous environmental sanction charges and subsequent compliance towards environmental regulations. Data used for the study come from about 9000 Swedish firms fined sometime between January 2002 and December 2012. Probabilities of compliance across various levels of sanctions are estimated using life-table methods and tested for equality using standard nonparametric methods. Association between size of sanction charges and subsequent behaviour is modelled by proportional hazard model for the rate of recidivism as well as by a family of flexible parametric accelerated failure-time models for the duration of compliance. The results show that duration of compliance may be described by a log-normal distribution. Further, it is demonstrated that sanctions charges do have significant detering effects on the risk of recidivism though the strength of the detering effect depends on whether or not we account for other possible correlates of recidivism. Possible explanations of the results and their policy implications are discussed; limitations of the current study highlighted; and potential extensions for future studies outlined. 

  • 4.
    Ghilagaber, Gebrenegus
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Wänström, Linda
    Stockholm University, Faculty of Social Sciences, Department of Statistics. Linköping University, Sweden.
    Adjusting for selection bias in assessing the relationship between sibship size and cognitive performance2015In: Journal of the Royal Statistical Society: Series A (Statistics in Society), ISSN 0964-1998, E-ISSN 1467-985X, Vol. 178, no 4, 22 p.925-944 p.Article in journal (Refereed)
    Abstract [en]

    Consistent negative correlations between sibship size and cognitive performance (as measured by IQ and other mental aptitude tests) have been observed in past empirical studies. However, the issue of potential selection process in the decision to have larger families (largersibship size) has been partly neglected in past single- and multilevel investigations. The present work extends existing knowledge in three aspects: (1) as factors affecting decision to increase family size may vary across the number and composition of current family size, we propose a sequential probit model (as opposed to binary or ordered models) for the propensity to increase sibship size; (2) we investigate if families who choose to increase family size are a representative random sample of the population of families or there exists selection; (3) in order to disentangle selection and causality we propose a multilevel multiprocess modelling where a continuous model for performance is estimated jointly with a sequential probit model for family-size decisions. The issues are illustrated through analyses of scores on PIAT tests among children of the NLSY79. We found substiantial between-family heterogeneity in the propensity to increase family size - thereby providing empirical evidence in support of the admixture hypothesis. Ignoring such adverse selection led to overestimation of the negative effects of sibship size on cognitive performance but our multiprocess modelling could mitigate the biasing effects of selection.

  • 5. Hiswåls, Anne-Sofie
    et al.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Wijk, Katarina
    Öberg, Peter
    Soares, Joaquim
    Macassa, Gloria
    Employment Status and Suicidal Ideation during Economic Recession2015In: Health science journal, ISSN 1791-809X, Vol. 9, no 1, 1-9 p., 13Article in journal (Refereed)
    Abstract [en]

     

    Objective: Suicide is a public health problem and an important indicator of severe mental ill-health. Thus, identifying risk factors for suicidal ideation is a public health priority. The aim of this study was to examine the relationship between employment status and suicidal ideation in Gävleborg County.

    Method:

    The study used data from the 2010 Health in Equal Terms survey, a cross-sectional survey carried out in Gävleborg County in Sweden. A total of 4,245 individuals, aged 16–65 years were included in the analyses. Descriptive and logistic regression analyses were carried out to assess the relationship between employment status and suicidal ideation

    Results:

    Individuals outside the labour market had odds of suicidal ideation of 4.21 (CI 3.14-5.64) compared to their employed counterparts. Controlling for other covariates, reduced the risk from 4.21(CI 3.14-5.64) in model I, to 1.73 (CI 1.16- 2.57) in model IV, but remained statistically significant. In addition, other variables were associated with suicidal ideation.

    Conclusion:

    There was a statistically significant association between being out of work and suicidal ideation. The association was explained partly by demographic, socio-economic and self-reported psychological variables. Results of the study suggest the need for primary prevention strategies among those out of the labour market, especially during times of economic hardship.

  • 6.
    Ghilagaber, Gebrenegus
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Elisa, WoldeYesus
    Gyimah, Stephen Obeng
    A family of flexible parametric duration functions with applications to modelling transition to parenthood in Eritrea, Ghana, and Kenya2014In: Advanced techniques for modelling maternal and child health in Africa / [ed] Ngianga-Bakwin Kandla; Gebrenegus Ghilagaber, Dordrecht: Springer, 2014, 185-209 p.Chapter in book (Refereed)
  • 7. Kandala, Ngianga-Bakwin
    et al.
    Ghilagaber, GebrenegusStockholm University, Faculty of Social Sciences, Department of Statistics.
    Advanced techniques for modelling maternal and child health in Africa2014Collection (editor) (Refereed)
  • 8. Manda, Samuel O. M.
    et al.
    Kandala, Ngianga-Bakwin
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Advanced Techniques for Modelling Maternal and Child Health in Africa2014In: Advanced Techniques for Modelling Maternal and Child Health in Africa / [ed] Ngianga-Bakwin Kandala, Gebrenegus Ghilagaber, Dordrecht: Springer, 2014, 1-7 p.Chapter in book (Refereed)
  • 9.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Advances in modelling maternal and child health in Africa: what have we learned and what is next?2014In: Advanced techniques for modelling maternal and child health in Africa / [ed] Ngianga-Bakwin Kandala; Gebrenegus Ghilagaber, Dordrecht: Springer Netherlands, 2014, 321-325 p.Chapter in book (Refereed)
  • 10.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Analysis of grouped survival data: a synthesis of various traditions and application to modeling childhood mortality in Eritrea2014In: Advanced techniques for modelling maternal and child health in Africa / [ed] Ngianga-Bakwin Kandala, Gebrenegus Ghilagaber, Dordrecht: Springer, 2014, 107-122 p.Chapter in book (Refereed)
  • 11.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Disentangling selection and causality in assessing the effects of health inputs on child survival: case studies from east Africa2014In: Advanced Techniques for Modelling Maternal and Child Health in Africa / [ed] Ngianga-Bakwin Kandala, Gebrenegus Ghilagaber, Dordrecht: Springer Netherlands, 2014, 11-28 p.Chapter in book (Refereed)
  • 12. Hiswåls, Anne-Sofie
    et al.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Walander, Anders
    Wijk, Katarina
    Öberg, Peter
    Soares, Joaquim
    Macassa, Gloria
    Employment status and inequalities in self-reported health2014In: Epidemiology, Biostatistics and Public Health, ISSN 2282-2305, E-ISSN 2282-0930, Vol. 11, no 4, e10006-1-e1006-11 p.Article in journal (Refereed)
  • 13.
    Ghilagaber, Gebrenegus
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Antai, Diddy
    Kandala, Ngianga-Bakwin
    Modelling spatial effects on childhood mortality via geo-additive Bayesian discrete-time survival model: a case study from Nigeria2014In: Advanced techniques for modelling maternal and child health in Africa / [ed] Ngianga-Bakwin Kandala; Gebrenegus Ghilagaber, Dordrecht: Springer, 2014, 29-48 p.Chapter in book (Refereed)
  • 14. Khatab, Khaled
    et al.
    Felten, Michael K.
    Kandala, Nagianga B.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Gumber, Anil
    Kraus, Thomas
    Risk Factors Associated with Asbestos-related Diseases: results of the Asbestos Surveillance Programme Aachen2014In: European medical journal. Respiratory, 1-9 p.Article in journal (Refereed)
    Abstract [en]

    The aim of this study was to examine the association between workplace exposure to asbestos and risk factors for developing related chronic respiratory diseases, using the analysis of a cohort of 8,582 formerly asbestos-exposed workers, as well as to assess the grade value of three risk categories used for a focused surveillance procedure. The results showed that the participants who were aged over 65 (OR and 95% CI: 11.47 [5.48-23.99]) and active smokers (OR and 95% CI: 9.48 [4.07-22.09]), were at a significantly high risk for developing lung cancer. The risk of developing benign lesions of the lung or pleura (BLLP) was almost 6-times higher (OR and 95% CI: 5.76 [4.7-7]) for the age group over 65. The risk of developing mesothelioma was influenced by exposure duration (OR and 95% CI: 4.36 [1-19.01]); and for the age group over 65 (OR and 95% CI: 4.58 [1.86-11.27]). The study has demonstrated that the use of risk categories based on a combination of risk factors (age, smoking status, and duration of exposure) could be advantageous for planning the target health surveillance programmes.

  • 15.
    Ghilagaber, Gebrenegus
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Peristera, Paraskevi
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Sequential probit modelling of family and community effects on educational progress among children to Polish and Turkish immigrants in Sweden2014In: Quality and quantity, ISSN 0033-5177, E-ISSN 1573-7845, Vol. 48, no 6, 3243-3253 p.Article in journal (Refereed)
    Abstract [en]

    We explore effects of individual, family, and neighborhood effects on educational progress. The statistical model used is a multilevel sequential probit model. Such formulation allows the covariate-effects to vary across different educational levels. Results based on about 2,100 children whose parents are either native Swedes or migrants from Poland or Turkey provide new insights with regard to differentials in educational progress across background varaiables. Among others, we find that parental education is a strong predictor of educational progress at all levels. On the other hand, while family structure, family economy, and ethinic background are strongly correlated to educational progress at lower levels, their effect diminishes at higher levels of education. Possible exaplanations and implications of the results are presented.

  • 16.
    Kum, Cletus Kwa
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Thorburn, Daniel
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Pedro, Gil
    Björkman, Anders
    A Nonparametric Bayesian Approach to Estimating Malaria Prophylactic Effect After Two Treatments2013In: International Journal of Statistics in Medical Research, ISSN 1929-6029, Vol. 2, no 2, 76-87 p.Article in journal (Refereed)
    Abstract [en]

    Two treatment regimens for malaria are compared in their abilities to cure and combat reinfection. Bayesian analysis techniques are used to compare two typical treatment therapies for uncomplicated malaria in children under five years, not only in their power to resist recrudescence, but also how long they can postpone recrudescence or reinfection in case of failure. We present a new way of analysing this type of data using Markov Chain Monte Carlo techniques. This is done using data from clinical trials at two different centres. The results which give the full posterior distributions show that artemisinin-based combination therapy is more efficacious than sulfadoxine-pyrimethamine. It both reduced the risk of recrudescence and delayed the time until recrudescence.

  • 17. Artman, Henrik
    et al.
    Brynielsson, Joel
    Edlund, Lena
    Fallgren, Per
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Forsberg, Lars
    Stockholm University, Faculty of Science, Department of Mathematics and Science Education.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Gustavii, Jonathan
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Herzing, Mathias
    Stockholm University, Faculty of Social Sciences, Department of Economics.
    Häckner, Jonas
    Stockholm University, Faculty of Social Sciences, Department of Economics.
    Jacobsson, Adam
    Stockholm University, Faculty of Social Sciences, Department of Economics.
    Jacobsson, Eva-Maria
    Källmén, Håkan
    Lindquist, Sinna
    Lundström, Anders
    Muren, Astri
    Stockholm University, Faculty of Social Sciences, Department of Economics.
    Sjöberg, Eric
    Stockholm University, Faculty of Social Sciences, Department of Economics.
    Thuresson, Björn
    Tjörnhammar, Edward
    Wickström, Hans
    Effektiv miljötillsyn: slutrapport2013Report (Other academic)
    Abstract [en]

    The Swedish Environmental Protection Agency (Naturvårdsverket) has financed the interdisciplinary research program “Efficient Environmental Inspections and Enforcement” (“Effektiv miljötillsyn”). The researchers are affiliated to Stockholm University, which is the responsible research institution, the Royal Institute of Technology (Kungliga Tekniska Högskolan), the Karolinska Institutet, and the Swedish Defense Research Agency (Totalförsvarets forskningsinstitut). The goal has been to develop new knowledge, thereby achieving more efficient environmental inspections and enforcement and obtaining new scientific perspectives on environmental inspections and enforcement.

    The report studies methods for inspections and the communication between the inspector and the representative of the inspected facility, how the institutional framework for the inspection process works, and demonstrates the possibilities of measuring the effects of inspections and enforcement. The researchers involved in the program are fully responsible for the content of this report.

    The Swedish Environmental Protection Agency will use the results as a base for its continuing efforts to improve inspection and enforcement guidance and to develop the following up and evaluation of inspections and enforcement and guidance.

  • 18.
    Kum, Cletus Kwa
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Thorburn, Daniel
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Gil, Perdo
    Björkman, Anders
    On the Effects of Malaria Treatment on Parasite Drug Resistance: Probability Modelling of Genotyped Malaria Infections2013In: The International Journal of Biostatistics, ISSN 1557-4679, Vol. 9, no 1, 135-148 p.Article in journal (Refereed)
    Abstract [en]

    We compare the frequency of resistant genes of malaria parasites before treatment and at first malaria incidence after treatment. The data come from a clinical trial at two health facilities in Tanzania and concerns single nucleotide polymorphisms (SNPs) at three positions believed to be related to resistance to malaria treatment. A problem is that mixed infections are common, which both obscures the underlying frequency of alleles at each locus as well as the associations between loci in samples where alleles are mixed. We use combinatorics and quite involved probability methods to handle multiple infections and multiple haplotypes. The infection with the different haplotypes seemed to be independent of each other. We showed that at two of the three studied SNPs, the proportion of resistant genes had increased after treatment with sulfadoxine-pyrimethamine alone but when treated in combination with artesunate, no effect was noticed. First recurrences of malaria associated more with sulfadoxine-pyrimethamine alone as treatment than when in combination with artesunate. We also found that the recruited children had two different ongoing malaria infections where the parasites had different gene types.

  • 19. Macassa, Gloria
    et al.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Charsmar, Harry
    Stockholm University, Faculty of Social Sciences, Department of Sociology.
    Walander, Anders
    Sundin, Örjan
    Soares, Joaquim
    Geographic differentials in mortality of children in Mozambique: Their implications for achievement of millennium development goal 42012In: Journal of Health, Population and Nutrition, ISSN 1606-0997, Vol. 30, no 3, 331-345 p.Article in journal (Refereed)
    Abstract [en]

    In the light of Mozambique's progress towards the achievement of Millennium Development Goal 4 of reducing mortality of children aged less than five years (under-five mortality) by two-thirds within 2015, this study investigated the relationship between the province of mother's residence and under-five mortality in Mozambique, using data from the 2003 Mozambican Demographic and Health Survey. The analyses included 10,326 children born within 10 years before the survey. Results of univariate and multivariate analyses showed a significant association between under-five mortality and province (region) of mother's residence. Children of mothers living in the North provinces (Niassa, Cabo Delgado, and Nampula) and the Central provinces (Zambezia, Sofala, Manica, and Tete) had higher risks of mortality than children whose mothers lived in the South provinces, especially Maputo province and Maputo city. However, controlling for the demographic, socioeconomic and environmental variables, the significance found between the place of mother's residence and under-five mortality reduced slightly. This suggests that other variables (income distribution and trade, density of population, distribution of the basic infrastructure, including healthcare services, climatic and ecologic factors), which were not included in the study, may have confounding effects. This study supports the thought that interventions aimed at reducing under-five mortality should be tailored to take into account the subnational/regional variation in economic development. However, research is warranted to further investigate the potential determinants behind the observed differences in under-five mortality.

  • 20. Heugh, Kathleen
    et al.
    Benson, Carol
    Stockholm University, Centre for Teaching and Learning.
    Yohannes, Mekonnen Alemu Gebre
    Bogale, Berhanu
    Implications for Multilingual Education: Student Achievement in Different Models of Education in Ethiopia2012In: Multilingual Education and Sustainable Diversity Work: From Periphery to Center / [ed] Tove Skutnabb-Kangas, Kathleen Heugh, London: Taylor & Francis, 2012, 239-262 p.Chapter in book (Refereed)
  • 21.
    Benson, Carol
    et al.
    Stockholm University, Centre for Teaching and Learning.
    Heugh, Kathleen
    Bogale, Berhanu
    Yohannes, Mekonnen Alemu Gebre
    Multilingual Education in Ethiopian Primary Schools2012In: Multilingual Education and Sustainable Diversity Work: From Periphery to Center / [ed] Tove Skutnabb-Kangas, Kathleen Heugh, London: Taylor & Francis, 2012, 32-61 p.Chapter in book (Refereed)
  • 22.
    Ghilagaber, Gebrenegus
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Hedlin, Dan
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Model-based indirect standardization with in-built standard population: illustration with demographic and health survey data2010In: Official statistics : methodology and applications in honour of Daniel Thorburn / [ed] Michael Carlson, Hans Nyquist, Mattias Villani, Stockholm: Department of Statistics, Stockholm University , 2010, 179-191 p.Chapter in book (Other academic)
  • 23.
    Ghilagaber, Gebrenegus
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Koskinen, Johan
    Stockholm University, Faculty of Social Sciences, The Swedish Institute for Social Research (SOFI).
    Bayesian Adjustment of Anticipatory Covariates in Analyzing Retrospective Data2009In: Mathematical Population Studies, ISSN 0889-8480, Vol. 16, no 2, 105-130 p.Article in journal (Refereed)
    Abstract [en]

    In retrospective surveys, records on important variables such as the respondent's educational level and social class refer to what is achieved by the date of the survey. Such variables are then used as covariates in investigations of behavior such as marriage and divorce in life segments that have occurred before the survey. To what extent can any change in the behavior be attributed to the misclassification of respondents across the various levels of the anticipatory variable? To what extent do they reflect real differences in the behavior across the levels? The connection is obtained by a Bayesian adjustment, by specifying a continuous-time Markov model for the incompletely observed time-varying anticipatory covariates, and by implementing standard Bayesian data augmentation techniques. The issues are illustrated by estimating effects of educational level on risks of divorce in a multiplicative piecewise-constant hazard model. Results show that ignoring the time-inconsistency of anticipatory variables may seriously plague the analyses because the relative risks across the anticipatory educational level are overestimated.

  • 24. Antai, Diddy
    et al.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Wedrén, Sara
    Macassa, Gloria
    Moradi, Tahereh
    Inequities in Under-Five Mortality in Nigeria: Differentials by Religious Affiliation of the Mother2009In: Journal of Religion and Health, ISSN 0022-4197Article in journal (Refereed)
  • 25.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Book Review of P. Lavallée (2007), Indirect Sampling. Springer, New York.2007In: Population Review, Vol. 46, no 2, 63-65 p.Article, book review (Other (popular science, discussion, etc.))
  • 26. Löfstedt, Petra
    et al.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Johansson, Annika
    Patterns of Contraceptive Use in Rural China:: Which way after the Cairo commitment?2005In: Changing reproductive patterns in rural China:: The influence of policy and gender, 2005Chapter in book (Other academic)
  • 27. Ghilagaber, Gebrenegus
    Modeling Multiple Causes of Failure: the Relationship between Intensity- and Logistic-Regression.1999In: Proceedings of the 3rd African Population Conference (The African Population in the 21st Century), Durban, South Africa, 6-10 December 1999), Volume 1, 1999, 349-361 p.Conference paper (Other academic)
  • 28. Ghilagaber, Gebrenegus
    On the problem of identification in multilplicative intensity models with multiple interactions1999In: Quality and quantity, ISSN 0033-5177, E-ISSN 1573-7845, Vol. 33, no 1, 45-58 p.Article in journal (Refereed)
    Abstract [en]

    In this paper we examine a multiplicative intensity model in which a covariate interacts with two other covariates in the same model. We demonstrate, analytically, that in such situations a log-linear parameterization based on two pairs of baseline levels cannot be transformed, uniquely, to the, otherwise equivalent, multiplicative parameterization. We show that the problem lies in an oversight of the conditional independence between the two covariates interacting with a common third covariate. As a solution, therefore, we propose an approach that takes due account of such dependence. Our proposed approach uses a common baseline level for the three covariates involved in interaction while estimating the corresponding relative intensities. The issues addressed are illustrated with a demographic data set involving the estimation of rates of transition to parenthood.

  • 29. Ghilagaber, Gebrenegus
    Analysis of survival data with multiple causes of failure: A comparison of hazard- and logistic-regression models with application in demography1998In: Quality and quantity, ISSN 0033-5177, E-ISSN 1573-7845, Vol. 32, no 3, 297-324 p.Article in journal (Refereed)
    Abstract [en]

    The purpose of the paper is to compare results of estimation and inference concerning covariate effects as obtained from two approaches to the analysis of survival data with multiple causes of failure. The first approach involves a dynamic model for the cause-specific hazard rate. The second is based on a static logistic regression model for the conditional probability of having had an event of interest. The influence of sociodemographic characteristics on the rate of family initiation and, more importantly, on the choice between marriage and cohabitation as a first union, is examined. We found that results, generally, are similar across the methods considered. Some issues in relation to censoring mechanisms and independence among causes of failure are discussed.

  • 30. Ghilagaber, Gebrenegus
    A Non-parametric Comparison of Some Estimators for the Common Mean of Several Normal Populations:: A Case of Small Replications.1996In: Journal of Ethiopian Statistical Association (JESA), Vol. 6, 25-43 p.Article in journal (Refereed)
  • 31. Ghilagaber, Gebrenegus
    A competing-risks analysis of the choice between marriage and cohabitation: experience of Swedish men born in 1936-19641995In: Demography, Economy and Welfare / [ed] Christer Lundh, Lund University: Lund University Press , 1995, 64-76 p.Chapter in book (Other academic)
  • 32. Ghilagaber, Gebrenegus
    Similarities among some hazard-rate and duration models for grouped and continuous life-time data with covariates: an exploration and application to modeling correlates of marital dissolution.1995Report (Other academic)
  • 33.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Sociology.
    Family Initiation Among Swedish Males born 1936-1964:: The Choice between Marriage and Cohabitation1993Report (Other academic)
  • 34.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Sociology.
    LISREL models in fertility and policy studies1993Other (Other (popular science, discussion, etc.))
  • 35.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Sociology.
    Performance in the Swedish Scholastic Aptitude Test:: Structural Stability Across Background Variables1993Report (Other academic)
  • 36.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Sociology.
    Simulating Population-Environment-Resource Interactions in the process of Desertification.1993Other (Other (popular science, discussion, etc.))
  • 37.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Sociology.
    The relationship between premarital cohabitation and subsequent marital stability:: Evidence for Swedish men born in 1936-1960.1993Report (Other academic)
  • 38.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Sociology.
    The Swedish Scholastic Aptitude Test:: Measurement and Dimensionality.1992Other (Other (popular science, discussion, etc.))
  • 39.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Sociology.
    Which Marriages End Up in Divorce?: Sociodemographic Correlates of Divorce in Sweden1992Other (Other (popular science, discussion, etc.))
  • 40. Ghilagaber, Gebrenegus
    Generating a Standard Normal Sample1988In: Proceedings of the Second International Workshop on the Use of Microcomputers in the Teaching of Physics and Mathematics, Aswan-Egypt, January 14-24, 1988, International Centre for Theoretical Physics, Trieste – Italy., 1988, 264- p.Conference paper (Other academic)
  • 41. Ghilagaber, Gebrenegus
    The Normal Distribution by Simulation1987In: Proceedings of the First International Workshop on the Use of Microcomputers in the Teaching of Physics and Mathematics, Khartoum-Sudan, March 22-31, 1987. International Centre for Theoretical Physics, Trieste - Italy., 1987, 169- p.Conference paper (Other (popular science, discussion, etc.))
  • 42.
    Ghilagaber, Gebrenegus
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Larsson, Rolf
    Maximum Likelihood Adjustment of Anticipatory Covariates in Analyzing Retrospective Survey DataIn: Mathematical Population Studies, ISSN 0889-8480Article in journal (Refereed)
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