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Re: st: Pairing predictors in tuples.


From   Eric Booth <ebooth@ppri.tamu.edu>
To   "<statalist@hsphsun2.harvard.edu>" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Pairing predictors in tuples.
Date   Mon, 2 Aug 2010 16:28:33 +0000

<>

Put x4 & x5 in quotes:

****!
clear
set obs 1000
forval n=1/5 {
	g x`n' = rnormal()*100
}
g y = round(abs(rnormal()*1))

*****
tuples x1 x2 x3 "x4 x5"
forval i = 1/`ntuples'{
     logit y `tuple`i''
     di "`e(cmdline)'"
     outreg2 using "test", append

}
****!

~ Eric
__
Eric A. Booth
Public Policy Research Institute
Texas A&M University
ebooth@ppri.tamu.edu
Office: +979.845.6754



On Aug 2, 2010, at 11:17 AM, Bradley Fedy wrote:

> Hi,
> 
> I am using tuples to cycle through models using different subsets of
> predictors.  My code looks something like this:
> 
> tuples x1 x2 x3 x4 x5
> forval i = 1/31{
>      logit y `tuple`i"
> }
> 
> However, I do not want all possible combinations.  I would like predictors
> x4 and x5 to always enter the model together (i.e. one cannot be present
> without the other).
> 
> Any suggestions on how to make x4 and x5 always enter the model together
> would be greatly appreciated.
> 
> Thanks,
> Brad
> 
> Stata Ver. 10.1
> 
> 
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