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st: Using Cronbach's alpha to generate sub scales.

From   Francis Owusu <[email protected]>
To   [email protected]
Subject   st: Using Cronbach's alpha to generate sub scales.
Date   Sun, 12 Oct 2003 17:58:46 -0500

Hi all,

I need help using Stata to calculate Cronbach's alpha. I have data on different measures of performance and I want to group them into subgroups for further analysis. I have 2 problems:

1. Several of the questions were in negative, however in many cases, the negatives were not reversed in the calculation even though I did not include "asis" command. Any suggestions?

2. All of the survey questions are not on the same scale, so I include "std" command to standardize the items before summing. However, the new variable generated for the new scale had many negative scores. I know that the scale should not be in negative. What would you advise?


Francis Owusu
Department of Community & Regional Planning
Iowa State University
Ames IA, 50011

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