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st: RE: lincom intolerant of the variable name "d"
From
"Philip Ryan" <[email protected]>
To
<[email protected]>
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: [email protected]
[mailto:[email protected]] On Behalf Of Airey, David C
Sent: Sunday, 27 June 2010 5:55 AM
To: [email protected]
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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