SBROWNI: Stata module to calculate Spearman-Brown reliability correction for test length

Herve M. Caci ()

Statistical Software Components from Boston College Department of Economics

Abstract: The reliability of a test (Cronbach's alpha or Kuder-Richardson's coefficient in case of dichotomous items) is dependent of the number of items. This immediate command comes in two forms: (1) If the reliability is known for a test (#rel0) with any particular number of items (#count0), the Spearman-Brown formula can be used to estimate how much the reliability would increase if the number of items were increased to #count1; and (2) The converted formula can be used to estimate the number of items required to obtain a particular reliability (#rel1).

Language: Stata
Date: 1998-08-02
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