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st: Extracting a variable of a varliable list

From   Thomas Corneli´┐Żen <[email protected]>
To   <[email protected]>
Subject   st: Extracting a variable of a varliable list
Date   Mon, 25 Jul 2005 17:43:04 +0200

Dear Stata Users,
I want to write an ado file using the -syntax- command as follows:

syntax varlist(min=2) [if] [in]

The first variable in varlist is the dependent variable, the others are the independent variables. I need to access them seperately in my ado-file.
Therefore I create a local that contains the name of the dependent variable, i.e. the first word of the varlist-string, and a local that contains all the rest and can be used as a varlist of only the independent variables.

local depvar=word("`varlist'",1)

local indepvar=substr("`varlist'",length("`depvar'")+1,length("`varlist'"));

My problem is that if the varlist is very long, it gets cut off at the 81st character. It seems that both the -length- and the -substr- function can only be applied to strings up to 81 characters.

I tried also to precede 'varlist' in the -syntax- command by 'varname', 'name' or 'anything' to capture the independent variable, but that returns error messages.

Can anybody suggest a better way to do what I want to do? Is there a good way of splitting one varlist into two varlists?
Thanks a lot for any suggestions!

Thomas Cornelissen
Empirical Economic Research
University of Hannover, Germany
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