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Re: st: bootstrap saving option


From   Steven Samuels <sjsamuels@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: bootstrap saving option
Date   Sun, 6 Feb 2011 12:02:40 -0500

 Liwu-

What are you going to do with the coefficients saved from different - bootstrap- commands? If you want to compare them, see: http://www.stata.com/statalist/archive/2011-02/msg00322.html

Steve




--

The only variables listed in -ereturn list- that you can specify in the -bootstrap- commmand are the "scalars" listed first, not the matrices.

Save the coefficients by specifying them as _b[] variables. Type "help _variables". If you have lots of predictors, you can get all the coefficients by specifying "_b" instead of individual names. See below and the examples in the "help" for -bootstrap-.

If you want to run more than one model, save the results for each model to a different file and then append the results.
*******************
sysuse auto, clear
tempfile t1 t2 t3
bootstrap rmse=e(rmse) _b, ///
saving(`t1',replace) rep(10): reg mpg weight turn
use `t1', clear
gen byte model =1
save `t2'

sysuse auto, clear
bootstrap rmse=e(rmse) _b, ///
saving(`t3',replace) rep(10): reg mpg weight turn foreign
use `t3', clear
gen byte model =2
append using `t2'
des
****************************

Steve


On Feb 6, 2011, at 9:09 AM, Liwu wrote:

Thanks, Steve.
It helps me a lot.
Is there any way that I can save this matrix as new variables in the file?
I know I can use the following code:
mat beta=e(b)
svmat double beta, names(matcol)

However, if I want to run another bootstrap and save the e(b) in the
second column (i.e., not overlap the first e(b) in the first column
under the same variables), I have no idea so far. Thanks for your
help.

Thanks,
Liwu




----------
Date: Sat, 5 Feb 2011 10:00:19 -0500
From: Steven Samuels <sjsamuels@gmail.com>
Subject: Re: st: bootstrap saving option

bootstrap rmse=e(rmse) _b[weight] _b[turn], rep(10): reg mpg weight turn

Steve
sjsamuels@gmail.com
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