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st: bstrap


From   "Patrick Sturgis" <p.sturgis@surrey.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: bstrap
Date   Fri, 5 Dec 2003 09:43:15 -0000

I am using the following program to obtain the 95% confidence interval
around the difference between 2 average correlations, obtained via the alpha
command.

program define avcorwithin
  version 7.0
  if "`1'" == "?" {
  global S_1 "avcorwithin"
  exit
  }
  tempname y
  alpha bef*
  scalar `y' = r(rho)
  alpha aft*
 post `1' (`r(rho)'-`y')
 end


When I run this, I do not receive any error messages but receive the
following output, which suggest that no bootstrapping is being done:

. bstrap avcorwithin, reps(2000)
(obs=224)

Bootstrap statistics

Variable    Reps   Observed	Bias   Std. Err.   [95% Conf. Interval]

avcorwithin       0          .		.          .           	.         .  (N)
						.         .  (P)
						.         . (BC)

N =	normal, P = percentile, BC = bias-corrected

A diagnosis of my problem will be very gratefully received,

Patrick

Dr Patrick Sturgis
Department of Sociology
University of Surrey
Guildford
GU2 7XH
tel: 01483 686 974

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