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Re: st: Using mkmat with a local as the varlist


From   William Buchanan <william@williambuchanan.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Using mkmat with a local as the varlist
Date   Fri, 8 Mar 2013 14:15:31 -0800

Slight correction:

> webuse hsng2
> ivregress 2sls rent pcturban (hsngval = faminc region), small
> ereturn li
> loc instruments `e(insts)'
> di `"`instruments'"'
mkmat `instruments', matrix(B)

Apparently -mkmat- does not like factor variables.


On Mar 8, 2013, at 2:13 PM, William Buchanan <william@williambuchanan.net> wrote:

> webuse hsng2
> ivregress 2sls rent pcturban (hsngval = faminc i.region), small
> ereturn li
> loc instruments `e(insts)'
> di `"`instruments'"'
> 
> You weren't referencing the _macro_ where the variable names were stored correctly.  
> 
> HTH, 
> Billy
> 
> 
> On Mar 8, 2013, at 2:05 PM, Mauricio Esteban Cuak <cuak2000@gmail.com> wrote:
> 
>> Hi,
>> 
>> I'm trying to save the lists of variables from a macro as an argument
>> for the mkmat command.
>> Here is an example of the use I'm trying to give:
>> 
>> ******** Begin Code**************
>> 
>> sysuse auto, replace
>> 
>> foreach v of var * {
>> 	drop if missing(`v')
>> }
>> 
>> qui ivregress gmm price trunk (weight = turn length )
>> 
>> /*  Now i'd like to construct a matrix with the instruments      */
>> 
>> /* This works: */
>> 
>> mkmat trunk turn length, matrix(A)
>> 
>> /* But this doesn't:  */
>> 
>> local instruments e(insts)
>> 
>> mkmat `instruments', matrix(B)
>> 
>> 
>> ***** End of code ********
>> 
>> I've tried different ways to define the local but I haven't been able
>> to make it work. I think the problem is mkmat takes `instruments' as a
>> string and not as
>> a list of variables, but I don't know how to fix it...
>> 
>> Thanks for your time,
>> 
>> M.C.
>> *
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> 
> 
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