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Re: st: bootstrap saving option
From
Steven Samuels <[email protected]>
To
[email protected]
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 <[email protected]>
Subject: Re: st: bootstrap saving option
bootstrap rmse=e(rmse) _b[weight] _b[turn], rep(10): reg mpg weight turn
Steve
[email protected]
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