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Re: st: bootstrapping in stata 8


From   Chris Rohlfs <car@uchicago.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: bootstrapping in stata 8
Date   Sat, 1 Nov 2003 15:17:43 -0600 (CST)

dear statalist,

please disregard this question; i found a post by greg branch on 9/17/03
that addresses this exact issue.

thanks,
chris

On Fri, 31 Oct 2003, Chris Rohlfs wrote:

> hello everyone,
> 
> i'm having some problems getting a bootstrap program to work & would
> appreciate anyone's comments.  i think the problem may be specific to
> version 8.
> 
> anyways, i have a nonlinear estimation procedure nlcas, and i'm doing a
> bootstrap to calculate standard errors for the mean marginal effect of the
> variable x0.  my program looks like this:
> 
> program define nlmarg
> 	version 8.0
> 
> 	if "`1'" == "?" {
> 		* the program output will be stored in the macro named t
> 		global S_1 "t"
> 		exit
> 	}
> 
> * this calls the nonlinear program nlcas with dependent variable c
> 
> 	quietly nl cas c
> 
> * nlcas.ado produces two global macros, $X0 and X0ART.  these two
> * enter into my equation for the marginal effect variable `margfx'
> * as below
> 
> 	tempvar margfx
> 	gen `margfx' = $X0*c*(y0 + $X0ART*y0art)/(x0 + $X0ART*x0art)
> 	sum `margfx'
> 
> 	local t = r(mean)
> 
> 	post `1' (`t')
> 
> end
> 
> i run the program by typing this at the command line:
> 
> 	bootstrap "nlmarg" t, reps(1000) dots noisily
> 
> the program shows the mean for `margfx' from the first run, but then gives
> the error:
> 
> ( invalid name
> 
> command -> nlmarg
> error when command executed on original dataset under version 8 control
> r(198);
> 
> i think this means that `t' does not pass the information it's supposed to
> be passing & instead simply returns nothing -- though i'm not quite sure
> why.  i've tried writing it as $t as well & that doesn't seem to change
> things.  any ideas of what could be the problem?
> 
> thank you very much,
> chris
> 
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> 

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