Testing the Difference Between Two Alpha Coefficients With Small Samples of Subjects and Raters

Educational and Psychological Measurement - Tập 66 Số 4 - Trang 589-600 - 2006
Leonard S. Feldt1, Seonghoon Kim2
1University of Iowa
2ACT, Inc.

Tóm tắt

Researchers sometimes need a statistical test of the hypothesis that two values of Cronbach's alpha reliability coefficient are equal. The situation may involve scores from two different measures administered to independent random samples or from the same measure administered to random samples from two different populations. Feldt derived a test that functions well with large or moderate numbers of subjects. However, he validated this test only when the number of parts ( k) of the measurement was fairly large, as it would be if the parts were individual test items. He did not consider instances in which the parts were raters, and hence k would be as small as 2 or 3. In this article, the Feldt test is investigated for such situations. It is found to function quite well in its control of Type I error.

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Tài liệu tham khảo

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Thông tin
Thông tin xuất bản

Educational and Psychological Measurement

Tập 66 Số 4

589-600

Thông tin tác giả