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st: no stop option

From   "Yong-Seok Choi" <[email protected]>
To   <[email protected]>
Subject   st: no stop option
Date   Thu, 16 Oct 2003 12:11:02 +0900

Dear statalisters,

Here is my problem for which I need your help. (I'm using STATA8.0)
Simplified form of the data look like...

id   group  var1   var2   var3  var4 .........
1      a         1        .       3
2      a         3        .       2
3      b         1        2      4
4      b         2        1      5

I would like to do the mean-difference test for each variables by group.
So I make the do file containing

local i = 1
while `i' <= 3 {
ttest var`i', by(group)
local i = `i' + 1

Then, ttest for var1 is ok, but with var2 STATA makes error "r(420) 1group found, 2 required" (because of data missing) and stops without ttesting for var3.
Is there any way that I can get the result of ttest for var1 and var3 without being stopped at var2?

PS. I need to have the ttest results for var1 and var3, so I cannot use "capture" command.
Many thanks in advance.

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