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Research on Social Work Practice
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Understanding and Interpreting Polytomous Logistic Regression: Applications to Research on Social Work Practice

Yvonne A. Unrau

University of Calgary

Heather Coleman

University of Calgary

This article demonstrates the use of polytomous logistic regression (PLR) and its application to a case example. An outcome study is used to illustrate the use of PLR in applied social work research. The case example is taken from an outcome evaluation of a family support program, involving 250 cases. This instructive article provides readers with (a) a conceptual overview of PLR, (b) an example of how to interpret key features of statistical output (BMDP), (c) a simple formula for calculating probabilities and odds for a particular outcome, and (d) a substantive interpretation of how results can be used in the context of program evaluation. Finally, recommendations for the application of this statistic in practice settings are given.

Research on Social Work Practice, Vol. 8, No. 2, 223-235 (1998)
DOI: 10.1177/104973159800800206
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