You could check out -makematrix- from SSC. But the
do-it-yourself approach has attractions too.
Nick
[email protected]
Jeremy Reynolds
> I would like to accumulate the results of multiple t-tests into a
> matrix. Below is a piece of code I have written to
> accomplish the task,
> but my suspicion is that there is a better way to collect the
> results of
> an r-class command. The creation and manipulation of the
> matrices, in
> particular, seems awkward. Can anyone point me in the right
> direction?
>
> Thanks,
>
> Jeremy
>
> *Create a matrix
> matrix input ttestmat = (0)
>
> *Calculate t-tests comparing five variables at three points
> in time and
> save the results in the matrix
> forvalues i = 1(1)2 {
> local j=`i'+1
> foreach stub in var1_ var2_ var3_ var4_ var5_ {
> quietly: ttest `stub'1==`stub'`j', unpaired
> matrix ttestmat= (ttestmat\r(t))
> }
> }
>
> *Extract the submatrices with results (the first row contains
> zeros) and
> re-organize the matrix
> matrix ttestmat = ttestmat[2..6,1], ttestmat[7..11,1]
> matrix colnames ttestmat = 1v2 1v3
> matrix rownames ttestmat = var1_ var2_ var3_ var4_ var5_
>
> *List the results
> matrix list ttestmat
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
