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st: problems with bootstrap


From   dpokerhog@mchsi.com
To   statalist@hsphsun2.harvard.edu
Subject   st: problems with bootstrap
Date   Tue, 25 Nov 2003 17:45:58 +0000

Im currently trying to simulate both means and medians using bootstrap in 
Stata version 7.  I need to generate a distribution of simulated means and 
medians.  I am trying to generate these for a variable called “ployalty” which 
has a range of 0-1.  The cluster variable, “clstr”, has a range of 1-5.  In 
short, I am trying to generate means and medians using one observation from 
each cluster.

Here is the code that I used to try to simulate the means:

bs  “summarize ployal” “r(mean)”, reps (100) cluster (clster) saving (genmean)

However, the new file genmean.dta has the same value, .745, for all 100 of the 
observations.  What am I doing wrong?

Also, when I try to run the simulation for medians using the following code:

bs  “summarize ployal” “r(mean)”, reps (100) cluster (clster) saving (genmed)

The only value returned is no value, i.e. “.”  Any thoughts on what I’m doing 
wrong here?

Thanks,
Dave Hogberg
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