st: accumulating t-test results

[Jeremy Reynolds <jeremyr@uga.edu>]

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

--
********************
Dr. Jeremy Reynolds
Assistant Professor
Undergraduate Coordinator
Department of Sociology
117 Baldwin Hall
University of Georgia
Athens, GA 30602-1611
Phone: (706) 583-8072
Web: http://uga.edu/soc/people/faculty/reynolds_jeremy.php
Fax: (706) 542-4320

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