Journal article
Determining Sample Size for a Test of the Equality of Alpha Coefficients When the Number of Part-Tests Is Small
Psychological methods, Vol.4(4), pp.366-377
12/01/1999
DOI: 10.1037/1082-989X.4.4.366
Abstract
In some measurement studies, the researcher seeks to compare the internal consistency
reliability coefficients (α
1
and α
2
)
of 2 rating scales or 2 observational techniques. In planning such studies, the investigator must
determine the sample size (e.g., the number
of participants or raters) that should be used if the power of the test of the null hypothesis is
to be adequate. In this article, tables are
derived that enable the researcher to determine what sample sizes are required to attain a
specified power against a given alternative to the
hypothesis of equality of 2 values of Cronbach's alpha coefficient. The tables cover situations in
which either independent or dependent samples of
participants or raters are used to estimate the reliability coefficients.
Details
- Title: Subtitle
- Determining Sample Size for a Test of the Equality of Alpha Coefficients When the Number of Part-Tests Is Small
- Creators
- Leonard S Feldt - University of IowaRobert D Ankenmann - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Psychological methods, Vol.4(4), pp.366-377
- Publisher
- American Psychological Association
- DOI
- 10.1037/1082-989X.4.4.366
- ISSN
- 1082-989X
- eISSN
- 1939-1463
- Language
- English
- Date published
- 12/01/1999
- Academic Unit
- Psychological and Quantitative Foundations
- Record Identifier
- 9984371304902771
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