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st: RE: Check for coding of new variables using data patterns


From   Joe Canner <jcanner1@jhmi.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Check for coding of new variables using data patterns
Date   Tue, 22 Oct 2013 18:48:01 +0000

Caroline,

Yes, it would be nice to have something in Stata like the SAS "/ list" option.  In the meantime, you don't say what exactly you did with -collapse- so it's hard to say why that doesn't work.  If you have a variable (or can create one) that is nonmissing when var1-var5 are nonmissing you could do:

. collapse (count) somevar, by (newvar var1-var5)

Regards,
Joe Canner
Johns Hopkins University School of Medicine

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Thirukumaran, Caroline Pinto
Sent: Tuesday, October 22, 2013 2:19 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: Check for coding of new variables using data patterns

Hi,
Is there a way to check the coding of a newly created variable using data patterns of variables that have used to create the new variable?

As an example, newvar is a variable that has been created based on values of var1-var5. The code used for creating the newvar variable is as follows:
egen newvar=rsum(var1 var2 var3 var4 var5)

To check that newvar has been correctly coded, it would be helpful to have an output like the one below:

newvar var1 var2 var3 var4 var5 Frequency
0 0 0 0 0 0 10
1 0 0 0 0 1 20
1 0 1 0 0 0 40
2 0 0 1 1 0 70
2 0 1 1 0 0 80
3 2 0 1 0 0 110
3 1 0 1 0 1 120
4 1 0 1 2 0 130

-collapse-  gives an acceptable output (it does not give me the frequency count) only when var1 -var5 are binary.

I am using Stata 12.1 for Windows.

I get the output tabulated above from SAS using the following code:
proc freq data=abc;
 tables newvar*var1*var2*var3*var4*var5 / list missing; run;

Many thanks in advance,
Caroline Thirukumaran
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