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st: RE: Re: statalist-digest V4 #1868

From   "Nick Cox" <[email protected]>
To   <[email protected]>
Subject   st: RE: Re: statalist-digest V4 #1868
Date   Sun, 30 Jan 2005 17:01:08 -0000

Joseph Coveney has illustrated a way of 
doing this. Here is a slightly more 
Stataish version of that: 

use auto.dta, clear
ologit rep78 price turn
forval j = 1/`e(k_cat)' { 
	tempvar pre
	local prelist "`prelist' `pre'" 
predict `prelist'  

Here there is no need to initialise 
the macro prelist, which is born empty. 
(That would not be true if it had been 
used earlier in the same program.) 

Also, if you say 

tempvar pre 

Stata is not fussed if you said that
previously. `pre' will always refer 
to the last temporary variable defined
in that way. Naturally, you need to keep track 
of previous names, but that is what is being done here. 

[email protected] 

Mike Lacy
> I am wanting to use -predict- after -ologit- to put the predicted 
> probabilities into a set of temporary variables.  I think my 
> questions may 
> bring up enough issues about using temporary variables so as 
> to be of more general interest.
> Questions:
> 1) How to use -predict- to store values in a list of tempvars .
> Example:
> use auto.dta
> ologit rep78 price turn
> local k = `e(k_cat)'  /* save for future use
> local ptop = "p`k'"
> predict p1-`ptop'
> This works fine, but what I would really like is to
> get the predicted probabilities into a list of *tempvars.*
>     tempvar p1-`ptop'
> is apparently not legal syntax.
> So, I put all the the p1, ..., pk into a local macro, say plist,
> using run time information about k, so I get plist = "p1 p2 p3 ... pk"
> Then, I find that
>     tempvar `plist'
> creates the list of temporary variables as desired,
> but then I can't figure how to use `plist' to -predict-
> the list of probabilities into the tempvars in plist.
> So, what would be recommended as a way to get
> a vector of predicted probabilities into a
> list of tempvars? Perhaps my `plist' *can* be used?

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