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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 21:17:22 -0500
.
Maybe you are right, but this really shouldn't happen here, because this is not a time series data set, and the D operator is put in front of the variable name. I sent a note to tech support.
<<>>
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
> .
>
> 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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