Cronbach Alpha

[Mavis]

Hi ll,

I'm looking for a way to calculate the cronbach alpha in eviews 8. Has anyone done this test before?

greetings Mavis

[EViews Glenn]

It's not built in, but the following program snippet does an example computation in two different ways. Once could put this in an add-in with just a little bit of work

Code: Select all

' compute Cronbach's alpha example data from http://www.ats.ucla.edu/stat/spss/faq/alpha.html ' get data wfopen http://www.ats.ucla.edu/stat/spss/faq/alpha.sav ' create group and compute covariance matrix group g1 q1 q2 q3 q4 g1.cov(out=aa, df) cov !n = g1.@count ' sum and mean of the variances !sumvar = @sum(@getmaindiagonal(aacov)) ' sum of all covariances (variance of sum of the measures) !sumcov = @sum(@vec(aacov)) ' first definition scalar kronbach1 = !n/(!n-1) * (1 - !sumvar / !sumcov) ' sum and mean of of unique covariaces !sumhcov = @sum(@vech(aacov)) - !sumvar !meanhcov = !sumhcov / (!n * (!n-1)/2) ' second definition scalar kronback2 = !n *!meanhcov / (!sumvar/!n + (!n-1)*!meanhcov)

[Mavis]

thx Glenn!
I am going to try to implement it.