ERIC Number: EJ1343349
Record Type: Journal
Publication Date: 2022-Apr
Pages: 10
Abstractor: As Provided
ISBN: N/A
ISSN: N/A
EISSN: EISSN-1531-7714
Available Date: N/A
Power Properties of Ordinal Regression Models for Likert Type Data
Olsson, Ulf
Practical Assessment, Research & Evaluation, v27 Article 6 Apr 2022
We discuss analysis of 5-grade Likert type data in the two-sample case. Analysis using two-sample "t" tests, nonparametric Wilcoxon tests, and ordinal regression methods, are compared using simulated data based on an ordinal regression paradigm. One thousand pairs of samples of size "n"=10 and "n"=30 were generated, with three different degrees of skewness. For all sample sizes and degrees of skewness, the ordinal probit model has highest power. This is not surprising since the data was generated with this model in mind. Slightly more surprising is that the "t" test has higher power than the Wilcoxon test in all studied situations, even for skewed data. For "n"=30, the differences between the methods are small.
Descriptors: Regression (Statistics), Likert Scales, Sampling, Nonparametric Statistics, Sample Size, Data, Models, Simulation
Center for Educational Assessment. 813 North Pleasant Street, Amherst, MA 01002. e-mail: pare@umass.edu; Tel: 413-577-2180; Web site: https://scholarworks.umass.edu/pare
Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
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