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st: Scripting Question

From   "Martin M. Monti" <mmonti@Princeton.EDU>
To   <>
Subject   st: Scripting Question
Date   Fri, 29 Apr 2005 11:39:11 -0400

Hi Everyone,

I'm trying to write a .do file that may scroll through my variables performing simple tabstats and ttests on pairs of variables. The key variables to test/tabstat are identified by a string (e..g "judged") and an appended number (thus: e..g judged1, judged2, ...). A simple loop on an `i' macro will allow me to specify judged`i' in the loop and have it scroll through the various variables, but when I set a second macro (say `k') making it equal to `i'+1 (so that I can always do ttestes on variables in sequence (e.g. ttest time`i' = time`k' so that it's always "ttest time1 = time2", "ttest time3 = time4", and so on)) even though it will loop through the correct numbers (thus `k' is correctly being set to `i'+1), it will not allow me to append it to the string (unlike `i'!).

Here is the loop I use:

*the loop only sets `i' to odd numbers (so that `k' can scroll through the even ones)
forvalues i = 1 (2) 7 {
foreach k in `i'+1 {
table judged`i' judged`k'
tabstat time`i' time`k', stats(mean sd N)
ttest time`i' = time`k' if (judged`i' == 1 & judged`k' == 1)
tabstat rate`i' rate`k', stats(mean sd N)
ttest rate`i' = rate`k' if (judged`i' == 1 & judged`k' == 1)

Note, I''ve tried running the loop and the problem is that as it is supposed to execute the commands with `k' it will say that the variable judged (only with the `k' appended!) is ambiguous. Also, if I run the same exact loop, just replacing the 5 commands with only: display `i' and display `k' it will scroll correctly through the numbers.

Inpupt will be appreciated!



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Martin M. Monti
Princeton University
Department of Psychology
Green Hall 3-S-7
(609) 258-4480
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