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st: RE: lincom intolerant of the variable name "d"


From   "Philip Ryan" <philip.ryan@adelaide.edu.au>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: lincom intolerant of the variable name "d"
Date   Sun, 27 Jun 2010 10:06:30 +0930

<<>>

Possibly because Stata is interpreting your "d" as the differencing operator
in its time series commands?  See -help tsvarlist-  where Remark #4 states
that although the operator is "D.", lower case is also acceptable.

Phil

Philip Ryan
Professor and Director
Data Management & Analysis Centre
UNiversity orf Adelaide

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Airey, David C
Sent: Sunday, 27 June 2010 5:55 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: lincom intolerant of the variable name "d"

.

After use of anova and margins, I got this error:


. test 1.d = 2.d

 ( 1)  1bn.d - 2.d = 0

           chi2(  1) =   18.46
         Prob > chi2 =    0.0000

. lincom 1.d - 2.d
d-2:  operator invalid
r(198);

And then, changing the variable name "d" to "drug", I got this:

. test 1.drug = 2.drug

 ( 1)  1bn.drug - 2.drug = 0

           chi2(  1) =   18.46
         Prob > chi2 =    0.0000

. lincom 1. drug - 2. drug

 ( 1)  1bn.drug - 2.drug = 0

----------------------------------------------------------------------------
--
             |      Coef.   Std. Err.      z    P>|z|     [95% Conf.
Interval]
-------------+--------------------------------------------------------------
--
         (1) |        1.8   .4189935     4.30   0.000     .9787878
2.621212
----------------------------------------------------------------------------
--

Why would the variable name "d" be a problem?

-Dave


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