Read e-book online Quantitative and Qualitative Methods in Psychotherapy PDF

By Wolfgang Lutz, Sarah Knox

ISBN-10: 0415820707

ISBN-13: 9780415820707

In this assortment, foreign individuals come jointly to debate how qualitative and quantitative tools can be utilized in psychotherapy learn. The ebook considers the benefits and drawbacks of every process, and recognises how every one process can improve our knowing of psychotherapy.

Divided into elements, the ebook starts with an exam of quantitative examine and discusses how we will move observations into numbers and statistical findings. Chapters on quantitative equipment disguise the advance of recent findings and the advance of latest findings, settling on and analysing switch, and utilizing meta-analysis.

The moment half the booklet contains chapters contemplating how qualitative and combined tools can be utilized in psychotherapy study. Chapters on qualitative and combined tools determine quite a few how one can develop the trustworthiness of qualitative findings through rigorous facts assortment and research recommendations. tailored from a unique factor of Psychotherapy Research, this quantity should be key interpreting for researchers, teachers, and pros who desire a better realizing of the way a specific region of study tools can be utilized in psychotherapy.

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10 Ann M. Doucette and Abraham W. Wolf The chapter addresses the critical importance of measurement in psychotherapy research and presents an overview of item response theory (IRT: Hambleton, Swaminathan, and Rogers, 1990; Wright and Stone, 1979) and bifactor models (Reise, 2013) as a more comprehensive measurement model approach for psychotherapy outcome research. Basic principles and assumptions of the single and multi-parameter IRT and bifactor models are described. The advantages of IRT and bifactor models will be illustrated in a reanalysis of a psychotherapy outcome measure that was originally developed using classical test theory measurement (CTT: Gulliksen, 1950; Lord, 1980; Novick, 1966).

While the accepted rule of thumb is that a variance estimate of 60 percent or greater explained by the measure is considered good, it is important to remember that unidimensionality also depends on the size of the second dimension (contrast). 9 percent of the variance. 7, indicating that it has the strength of approximately three items, large enough in terms of the number of items to be considered as a separate dimension. In addition, the assumption of local independence, meaning a person’s response to an item is independent on their success or failure of any other item after adjusting for the ability of the person and the difficulty of the item, has not been met by these items.

Doucette and Abraham W. Wolf at the mild end of the trait continuum. Of even greater concern is the fact that stability is frequently misinterpreted by payors as indicative of a lack of treatment effectiveness, when in actuality, it is a reflection of a measurement artifact. A 2PL model was subsequently conducted on the sample data using the Parscale software program (Muraki and Bock, 1997) as a further examination of the items that degraded the Rasch model fit. The 2PL model offers some marginal improvement in fit over the Rasch model, and identified the same items in terms of varying discrimination.

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Quantitative and Qualitative Methods in Psychotherapy Research by Wolfgang Lutz, Sarah Knox

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