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Psychometric evaluation of the Working Alliance Inventory?Therapist version: Current and new short forms
Stockholms universitet, Samhällsvetenskapliga fakulteten, Psykologiska institutionen.
Rekke forfattare: 32019 (engelsk)Inngår i: Psychotherapy Research, ISSN 1050-3307, E-ISSN 1468-4381Artikkel i tidsskrift (Fagfellevurdert) Epub ahead of print
Abstract [en]

Background: The Working Alliance Inventory (WAI) and its short forms are widely used, although the properties of the therapists? versions have been little studied. Method: We examined the psychometric properties of two short forms (WAI-S-T, WAI-SR-T), and explored the creation of a psychometrically stronger short form using contemporary measure development techniques. Well-fitting items from the full 36-item WAI were identified in a development sample (131 therapists, 688 patients) using multi-level Bayesian Structural Equation Modeling, accounting for therapist rated effects. Multi-level Item Response Theory (IRT) methods aided creation of a revised short form (WAI-S-T-IRT). Factor structures of the three forms were assessed using multi-level ML estimation with robust standard errors. Results: Collinearity problems for the Goal and Task dimensions led to testing a two-factor model (Goal?Task, Bond). All three measures showed satisfactory fit; the WAI-S-T-IRT fit slightly better but differences were minor. Testing the structures in an independent sample (N?=?1117) yielded essentially the same results. No version showed strong measurement invariance. Discussion: Continued use of current therapist forms is supported; differentiation of theoretical dimensions is difficult with current measures, and may not be possible with self-report forms.

sted, utgiver, år, opplag, sider
2019.
Emneord [en]
alliance, therapist alliance, Working Alliance Inventory, alliance measures, measure development, Bayesian SEM, multi-level IRT
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-175738DOI: 10.1080/10503307.2019.1677964ISI: 000490808400001PubMedID: 31621525OAI: oai:DiVA.org:su-175738DiVA, id: diva2:1369191
Tilgjengelig fra: 2019-11-11 Laget: 2019-11-11 Sist oppdatert: 2020-01-16

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