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st: lincom intolerant of the variable name "d"


From   "Airey, David C" <david.airey@Vanderbilt.Edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: lincom intolerant of the variable name "d"
Date   Sat, 26 Jun 2010 15:24:51 -0500

.

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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