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st: RE: RE: warning for -tabdisplay-


From   "FEIVESON, ALAN H. (AL) (JSC-SK) (NASA)" <alan.h.feiveson@nasa.gov>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: warning for -tabdisplay-
Date   Tue, 2 Aug 2005 10:49:30 -0500

Nick - Thanks for your suggestion. I thought about making my own version of
-tabdisp- and putting this in, but I can't find code for tabdisp.ado in the
ado folders of Stata. Do you know if it exists as part of some larger file? 

Al

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: Thursday, July 28, 2005 12:39 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: RE: warning for -tabdisplay-

Although -disp- is an acceptable abbreviation for -display-, -tabdisp- is
the only name in question here. 

I am agnostic on this point, even though I have on occasion been bitten by
this. While you're waiting for StataCorp to think about and possibly do
this, the check is not too difficult: 

foreach v of var v1 v2 v3 { 
	bysort cess (`v') : assert `v'[1] == `v'[_N] } 

Nick
n.j.cox@durham.ac.uk 

FEIVESON, ALAN
 
> I often like to use  the -tabdisplay- command, but when I do, I 
> sometimes have this lurking fear that the variables in the "cell" are 
> not really constant, in which case using -tabdisplay- may give 
> erroneous information. Of course I can check for constant variables by 
> issuing other commands first, but this is a waste of time if they 
> really are constant. So I would like to propose that -tabdiplay- be 
> modified to give a warning message if a variable in the "cell" is not 
> constant. e.g.
> 
> 
> . tabdisp sess,cell(v1 v2 v3)
> ***  warning - v2 is not constant *****

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