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  • 1.
    Bayram, Nazan
    et al.
    Uludag University, Faculty of Economics and Adm sciences.
    Thorburn, Daniel
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Bilgel, Nazan
    Uludag university, Faculty of medicine.
    Quality of life among Turkish immirants in Sweden: a study for assessing the Measurement properties of the World Health Organization's Quality of Life 100 Instrument2011In: Migracijske i etnicke teme (Journal of Migration and Ethnic Studies), ISSN 1333 - 2546, Vol. 27, no 1, p. 39-55Article in journal (Refereed)
    Abstract [en]

    Many instruments have been developed to measure the multidimensional construct of quality of life. One of them has been developed by the World Health Organization (WHOQOL-100) and adapted into different languages and cultures around the world. The authors of this study wanted to assess the measurement properties of the Turkish version of WHOQOL-100, to find out the latent factors underlying quality of life, and to determine the direction and magnitude of the interdependent effects among these factors by using structural equation modeling (SEM). The measurement properties of the Turkish version of WHOQOL-100 scale were assessed on 520 voluntary participants who were immigrants in Stockholm/Sweden. SEM gave us one second-order factor QOL and the five correlated first-order factors labelled: physical, social relations, psychological, environment and independence. In the model for total participants, all the factor loadings were high (ranging from 0.60 to 0.92 except for “sexuality” which was 0.47), indicating a strong association between each of the latent factors and their respective items. In the models which were separately constructed regarding birthplace, the authors found a strong association between each of the latent factors and their respective items. The most substantial possible effect on QOL was psychological domain (0.93), which was larger than physical health (0.84), social relations (0.82), level of independence (0.91) and environment (0.73). The effect of psychological domain on the overall quality of life is greater than those of other domains.

  • 2.
    Bayram, Nuran
    et al.
    Uludag University.
    Nyquist, Hans
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Thorburn, Daniel
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Bilgel, Nazan
    Uludag University.
    Turkish immigrants in Sweden: are they integrated?2009In: The international migration review, ISSN 0197-9183, E-ISSN 1747-7379, Vol. 43, no 1, p. 90-111Article in journal (Refereed)
    Abstract [en]

    Many in Europe believe that large numbers of Turkish immigrants have failed to integrate into their host communities. How is ths situation in Sweden? We found that most of the Turkish immigrants felt themselves to be Turkish and Sweden was accepted as a foregin country. Turkish-originated media was followed frequently and strong ties with relatives in Turkey were maintained. Marriage and friendship with native Swedes were not well accepted. We conclude that despite the mulicultural aspects of Swedish integration policies, Turkish immigrants in Sweden were not well integrated and they prefer to live within the boundaries of their segregated, closed, small communities.

  • 3.
    Franzén, Jessica
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Statistics. Swedish University of Agricultural Sciences, Sweden.
    Thorburn, Daniel
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Urioste, Jorge I.
    Strandberg, Erling
    Genetic evaluation of mastitis liability and recovery through longitudinal analysis of transition probabilities2012In: Genetics Selection Evolution, ISSN 0999-193X, E-ISSN 1297-9686, Vol. 44, article id 10Article in journal (Refereed)
    Abstract [en]

    Background: Many methods for the genetic analysis of mastitis use a cross-sectional approach, which omits information on, e.g., repeated mastitis cases during lactation, somatic cell count fluctuations, and recovery process. Acknowledging the dynamic behavior of mastitis during lactation and taking into account that there is more than one binary response variable to consider, can enhance the genetic evaluation of mastitis. Methods: Genetic evaluation of mastitis was carried out by modeling the dynamic nature of somatic cell count (SCC) within the lactation. The SCC patterns were captured by modeling transition probabilities between assumed states of mastitis and non-mastitis. A widely dispersed SCC pattern generates high transition probabilities between states and vice versa. This method can model transitions to and from states of infection simultaneously, i.e. both the mastitis liability and the recovery process are considered. A multilevel discrete time survival model was applied to estimate breeding values on simulated data with different dataset sizes, mastitis frequencies, and genetic correlations. Results: Correlations between estimated and simulated breeding values showed that the estimated accuracies for mastitis liability were similar to those from previously tested methods that used data of confirmed mastitis cases, while our results were based on SCC as an indicator of mastitis. In addition, unlike the other methods, our method also generates breeding values for the recovery process. Conclusions: The developed method provides an effective tool for the genetic evaluation of mastitis when considering the whole disease course and will contribute to improving the genetic evaluation of udder health.

  • 4.
    Franzén, Jessica
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Thorburn, Daniel
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Urioste, Jorge I
    Sveriges lantbruksuniversitet, Uppsala.
    Strandberg, Erling
    Sveriges lantbruksuniversitet, Uppsala.
    Use of transition probabilities for estimation of mastitis resistance2010Conference paper (Refereed)
  • 5. Kum, Cletus Kwa
    et al.
    Thorburn, Daniel
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Ghilagaber, Gebrenegus
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Björkman, Anders
    Gil, José Pedro
    Effects of Some Biological Covariates on the Probability of First Recurrence of Malaria following Treatment with Artemisinin Combination Therapy2018In: International Journal of Statistics in Medical Research, ISSN 1929-6029, Vol. 7, no 1, p. 1-9Article in journal (Refereed)
  • 6.
    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, E-ISSN 1557-4679, Vol. 9, no 1, p. 135-148Article 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.

  • 7.
    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, p. 76-87Article 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.

  • 8.
    Thorburn, Daniel
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Bayesian methods in survey sampling2009In: Baltic-Nordic-Ukrainian Summer school on Survey Statistics / [ed] Olga Vasyluk, Kiev, Ukraina: University of Kiev , 2009, p. 24-25Conference paper (Other academic)
  • 9.
    Thorburn, Daniel
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Bayesian Probability and Methods2006In: The first Africa-Sweden Conference in Mathematics, / [ed] David Bekollé, Yaoundé: University of Yaoundé , 2006Conference paper (Other academic)
  • 10.
    Thorburn, Daniel
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Control of the coding operation in statistical investigations: some contributions2005In: JOBS: journal of obnoxious statistics / [ed] Edith de Leeuw, Amsterdam: TT-Publikaties , 2005, p. 69-71Chapter in book (Other academic)
  • 11.
    Thorburn, Daniel
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Discusion2007In: Journal of Official Statistics, ISSN 0282-423X, E-ISSN 2001-7367, Vol. 23, no 4, p. 477-483Article in journal (Other academic)
  • 12.
    Thorburn, Daniel
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Harald Cramér: a great statistician2013In: Lithuanian Journal of Statistics, ISSN 2029-7262, Vol. 52, no 1, p. 109-112Article in journal (Refereed)
    Abstract [en]

    Harald Cramér is one of the great persons in the history of mathematical statistics and insurance mathematics in the twentieth century. He is perhaps the most well known Swedish statistician in modern time. The editor of “Lithuanian Journal of Statistics” has kindly asked me to write some notes on Harald Cramér, may be because my supervisor was one of Cramér’s pupils. I am not the best person to do so, but I will do my best. At the end I will also give some references for those who want to read more about Cramér.

  • 13.
    Thorburn, Daniel
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    On non-response correction in NMAR-situations2010In: Workshop on survey sampling theory and methodology: August 23-27, 2010, Vilnius : [reports] / [ed] Danute Krapavickaite, Vilnius: Statistics Lithuania , 2010, p. 163-170Conference paper (Other academic)
  • 14.
    Thorburn, Daniel
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Significance testing, interval estimation or Bayesian inference: comments to "Extracting a maximum of useful information from statistical research data" by S. Sohlberg and G. Andersson2005In: Scandinavian Journal of Psychology, ISSN 0036-5564, E-ISSN 1467-9450, Vol. 46, no 1, p. 79-82Article in journal (Other academic)
    Abstract [en]

    Statistical inference plays an important part in the formation of scientific knowledge in psychology. Starting from a paper by Sohlberg and Andersson (2005; Scandinavian Journal of Psychology, 46, 69-77) these issues are discussed. It is argued that interval estimates are easy to understand and that they are more suitable than significance testing for most problems. Bayesian inference is a coherent description of the information building process. With some examples it is shown that null hypothesis significance testing is full of contradictions. Finally, some other important issues like convenience sampling and model selection are shortly mentioned.

  • 15.
    Thorburn, Daniel
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Andersson, Per Gösta
    Matematiska institutionen, Linköpings universitet.
    An optimal calibration distance leading to the optimal regression estimator2005In: Survey Methodology, ISSN 0714-0045 ; 1492-0921, Vol. 31, no 1, p. 95-99Article in journal (Refereed)
    Abstract [en]

    When there is auxiliary information in survey sampling, the design based "optimal (regression) estimator" of a finite population total/mean is known to be (at least asymptotically) more efficient than the corresponding GREG estimator. We will illustrate this by some simulations with stratified sampling from skewed populations. The GREG estimator was originally constructed using an assisting linear superpopulation model. It may also be seen as a calibration estimator; i.e., as a weighted linear estimator, where the weights obey the calibration equation and, with that restriction, are as close as possible to the original "Horvitz-Thompson weights" (according to a suitable distance). We show that the optimal estimator can also be seen as a calibration estimator in this respect, with a quadratic distance measure closely related to the one generating the GREG estimator. Simple examples will also be given, revealing that this new measure is not always easily obtained.

     

  • 16.
    Thorburn, Daniel
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Balog, Marek
    University of Economics, Bratislava, Slovakia.
    Extreme value treatment for samples from skew income distributions2007In: Statistics in Transition, ISSN 1234-7655, Vol. 8, no 1, p. 139-154Article in journal (Refereed)
  • 17.
    Thorburn, Daniel
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Bayram, Nuran
    Uludag University, Bursa, Turkey.
    Bilgel, Nazan
    Uludag university, Bursa, Turkey.
    Nyquist, Hans
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Turkish immigrants in Sweden: are they integrated?2009In: The international migration review, ISSN 0197-9183, E-ISSN 1747-7379, Vol. 43, no 1, p. 90-111Article in journal (Refereed)
    Abstract [en]

    Many in Europe believe that large numbers of Turkish immigrants have failed to integrate into their host communities. How is this situation in Sweden? We found that most of the Turkish immigrants felt themselves to be Turkish and Sweden was accepted as a foreign country. Turkish-originated media was followed frequently and strong ties with relatives in Turkey were maintained. Marriage and friendship with native Swedes were not well accepted. We concluded that despite the multicultural aspects of Swedish integration policies, Turkish immigrants in Sweden were not well integrated and they prefer to live within the boundaries of their segregated, closed, small communities.

  • 18.
    Thorburn, Daniel
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Bondesson, Lennart
    Umeå Universitet.
    A list sequential sampling method suitable for real-time sampling2008In: Scandinavian Journal of Statistics, ISSN 0303-6898, E-ISSN 1467-9469, Vol. 35, no 3, p. 466-483Article in journal (Refereed)
    Abstract [en]

    A flexible list sequential πps sampling method is introduced and studied. It can reproduce any given sampling design without replacement, of fixed or random sample size. The method is a splitting method and uses successive updating of inclusion probabilities. The main advantage of the method is in real-time sampling situations where it can be used as a powerful alternative to Bernoulli and Poisson sampling and can give any desired second-order inclusion probabilities and thus considerably reduce the variability of the sample size

  • 19.
    Thorburn, Daniel
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Burestam, Silke
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Correcting the regression estimator for an abundance of auxiliary variables2007In: BaNoCoss II: proceedings / [ed] Risto Lehtonen, Helsinki: University of Helsinki , 2007, p. 67-Conference paper (Other academic)
  • 20.
    Thorburn, Daniel
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Nuran, Bayram
    Uludag university, Bursa, Turkey.
    Demirhan, Haydar
    Hacettepe University, Beytepe Ankara Turkey.
    Bilgel, Nazan
    Uludag university, Bursa, Turkey.
    Quality of life among Turkish immigrants in Sweden2007In: Quality of Life Research, ISSN 0962-9343, E-ISSN 1573-2649, Vol. 16, no 8, p. 1319-1333Article in journal (Refereed)
    Abstract [en]

    To assess quality of life among Turkish immigrants in Sweden by using the WHOQOL-100 scale and to evaluate the domains’ contribution to explain the variance in the quality of life of the immigrants. Our hypothesis was QOL among Turkish immigrants in Sweden are better than Turkish people who are living in their home country. This study was performed in the districts of Stockholm where Turkish immigrants have mostly settled. With the help and guidance of the Turkish Association, a sample of 520 participants was selected. We collected the demographic data by printed questionnaires, and to measure the quality of life, we used the WHOQOL-100 scale Turkish version. For analysis, we used the SPSS V.13.0 and R package programs, variance analyses, and Bayesian regression. The quality of life among the sample of Turkish immigrants was found to be moderate, but higher than the sample of the Turkish population. The quality of life of male immigrants was found to be higher than for females. Swedish-born Turks had better quality of life perceptions. Turkish immigrants’ quality of life perceptions were better than those of the Turkish sample. The best scores were received from the third generation. The first generation and female immigrants need attention in order to receive higher quality of life perceptions

  • 21.
    Thorburn, Daniel
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Tongur, Can
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Assessing direct and indirect seasonal adjustment in state space - a comparison between ordinary and optimal approaches2013Report (Other academic)
    Abstract [en]

    The problem of whether seasonal adjustment should be used prior to or after aggregation of time series is quite old. We tackle the problem using the state space representation and the variance/covariance structure. The variances of the estimated components are compared for direct and indirect adjustment and also to the optimal adjustment method. The covariance structure between the time series is important for the relative efficiency. Indirect adjustment is always best when the series are independent, but when the series or the measurement errors are negatively correlated, direct estimation may be much better in the above sense. Some covariance structures indicate that direct adjustment should be used while others indicate that indirect approaches are more efficient. Signal to noise ratios and relative variances are used for inference.

  • 22.
    Thorburn, Daniel
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Tongur, Can
    Stockholm University, Faculty of Social Sciences, Department of Statistics.
    Assessing direct and indirect seasonal decomposition in state space2014In: Journal of Applied Statistics, ISSN 0266-4763, E-ISSN 1360-0532, Vol. 41, no 9, p. 2075-2091Article in journal (Refereed)
    Abstract [en]

    The problem of whether seasonal decomposition should be used prior to or after aggregation of time series is quite old. We tackle the problem by using a state-space representation and the variance/covariance structure of a simplified one-component model. The variances of the estimated components in a two-series system are compared for direct and indirect approaches and also to a multivariate method. The covariance structure between the two time series is important for the relative efficiency. Indirect estimation is always best when the series are independent, but when the series or the measurement errors are negatively correlated, direct estimation may be much better in the above sense. Some covariance structures indicate that direct estimation should be used while others indicate that an indirect approach is more efficient. Signal-to-noise ratios and relative variances are used for inference.

1 - 22 of 22
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