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Re: st: Program def syntax
From
Nick Cox <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: Program def syntax
Date
Tue, 25 Feb 2014 10:32:17 +0000
There is no black sorcery here. The only nuance here is the difference
between a thing and its name.
You allow -by()- so if you specify -by()- a consequence of the
-syntax- command is that it creates the local macro -by- containing
the name(s) of the variable you specify.
Suppose you specify
... , by(foreign)
then
di `by'
is interpreted by -display- as a request to
di foreign
and (what may be a surprise here) -display- is not in the habit of
displaying entire variables, so as a token of good-will it acts as if
you really meant
di foreign[1]
In your case, you should find that the value 1.2 relates somehow to
your variables and their values in the first observation.
What you want, naturally, is to see the _names_ themselves and to
insist on that you put
di "`by'"
where the " " emphasise to Stata that you want the string interpretation.
(When debugging I sometimes use -macro list- as a quick and dirty way
to get Stata to show the contents of all macros.)
Nick
[email protected]
On 25 February 2014 10:19, Johannes N. Blumenberg
<[email protected]> wrote:
> I got a small question regarding the program define syntax. I defined a
> program and set its syntax to
> syntax varlist [, BY(varlist) MOreoff]
>
> However, I am unable to access the varlist defined in "by". All that Stata
> returns to me is that the statement is true, when I try to display its
> content with the help of di `by'.
>
> When I put three variables into the by argument Stata returns "1.2". All
> reading in the guidelines etc did not help me.
>
> So, which kind of black sorcery is needed to return the variablelist defined
> in `by'? :)
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