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st: lincom intolerant of the variable name "d"
From
"Airey, David C" <[email protected]>
To
"[email protected]" <[email protected]>
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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