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st: RE: RE: bootstrap sampling and foreach


From   "Gallagher, Kelly, DOH" <[email protected]>
To   <[email protected]>
Subject   st: RE: RE: bootstrap sampling and foreach
Date   Fri, 21 Aug 2009 15:54:42 -0600

Thank you, Martin!!!  This tip works great!

Kelly Gwendolyn Gallagher, Ph.D.
Epidemiologist
Environmental Health Epidemiology Bureau
Epidemiology and Response Division
New Mexico Department of Health
1190 St. Francis Dr.
Santa Fe, NM  87502
505.476.3565


-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Martin Weiss
Sent: Wednesday, August 19, 2009 4:10 PM
To: [email protected]
Subject: st: RE: bootstrap sampling and foreach


<>

What is your intent in the second line of the first loop? Are you
checking
whether `x' is part of the " analytes_bootstrap "? If so, the returned
result is either 0 or 1...

The second loop would not receive all the results from the first loop,
only
the last one. Note that the results displayed by - estat bootstrap, all-
are
already there after the -bootstrap- command:


****
clear*
set obs 10000
gen x=rnormal()
	bs r(p95), reps(100): /*
 */su x, d

eret li

mat l e(ci_normal)
mat l e(ci_percentile)
mat l e(ci_bc)
****

If all you want is to store them, you could take it from here without
actually displaying them...

HTH
Martin

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Gallagher,
Kelly,
DOH
Sent: Mittwoch, 19. August 2009 23:46
To: [email protected]
Subject: st: bootstrap sampling and foreach

Hi, all, 

Using -bootstrap-, I'd like to estimate confidence intervals for
percentiles.  Also, given that I'd like to estimate C.I.s for
percentiles for a heap of variables, I'd like to use a foreach loop.

Do you have tips regarding the use of the foreach loop to save a scalar
or matrix of bootstrapped samples (which would then be used with
-estat-)?


foreach x of varlist *_u {
	bootstrap r(p95), reps(1000): summarize `x', detail
    	local analytes_bootstrap: list x in analytes_bootstrap
     	return scalar `x'=`analytes_bootstrap'
 }

foreach x of varlist *_u {
estat bootstrap, all
        }


Thanks!!!
Kelly


Kelly Gwendolyn Gallagher, Ph.D.
Epidemiologist
Environmental Health Epidemiology Bureau
Epidemiology and Response Division
New Mexico Department of Health
1190 St. Francis Dr.
Santa Fe, NM  87502
505.476.3565




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