Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down at the end of May, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: st: name conflict in posting a matrix


From   Nick Cox <n.j.cox@durham.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: name conflict in posting a matrix
Date   Wed, 11 Jul 2012 11:31:03 +0100

You used a temporary name. If you want to pick up e(xb_s), you need to define it as such. Not 

	ereturn scalar `xb_s'= r(mean)

but 

	ereturn scalar xb_s = r(mean)

I guess you are a point in your learning programming when you waste more time not reading the relevant chapters in [U] than you do by trying code changes to see what works and then puzzling at length over why it doesn't work. 

Nick 
n.j.cox@durham.ac.uk 

Emmanouil Mentzakis

Thank you for the example. If on top of the betas I wanted to also
bootstrap e.g. the y_fit how would I do it in the same program? Below
I ve edited your example to show what I d like to do but as expected
it produces an error.

********************
clear all
sysuse auto

program define toboot, eclass
    tempname b xb xb_s
    reg price mpg foreign
    matrix `b' = e(b)
    reg rep78 mpg foreign
    matrix `b' = `b', e(b)
    matrix colnames `b' = price:mpg price:foreign price:_cons ///
                          rep78:mpg rep78:foreign rep78:_cons
    ereturn post `b'
	
predict `xb', xb
	sum `xb'
	ereturn scalar `xb_s'= r(mean)
end

bootstrap _b xb=e(xb_s), reps(100) :toboot


On Tue, Jul 10, 2012 at 4:07 PM, Maarten Buis <maartenlbuis@gmail.com> wrote:
> On Tue, Jul 10, 2012 at 4:11 PM, Emmanouil Mentzakis wrote:
>> I think the problem is that I don't tell -ereturn- correctly that I
>> have two equations with the same covariates (I try to rename them
>> using -matrix coleq-) and it therefore sees the same covariates names
>> appear multiple times, hence the name conflict. However, I often
>> models in Stata use the same covariates in multiple equations and
>> naming them with a prefix similar to eq1 etc.
>
> *------------------------- begin example ------------------------------
> clear all
> sysuse auto
>
> program define toboot, eclass
>     tempname b
>     reg price mpg foreign
>     matrix `b' = e(b)
>     reg rep78 mpg foreign
>     matrix `b' = `b', e(b)
>     matrix colnames `b' = price:mpg price:foreign price:_cons ///
>                           rep78:mpg rep78:foreign rep78:_cons
>         ereturn post `b'
> end
>
> bootstrap _b, reps(100) :toboot
> *-------------------------- end example -------------------------------
>

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index