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st: RE: bootstrap gives errors with -rd-


From   Nick Cox <n.j.cox@durham.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: bootstrap gives errors with -rd-
Date   Fri, 11 Nov 2011 19:09:38 +0000

... and -rd- is ? 

Nick 
n.j.cox@durham.ac.uk 

D-Ta

I have the following problem.

I use the -rd- command to estimate a local effect of  (a treatment) X on 
outcomes Y (several ouotcomes, some binary and some continous) at Z=0 in 
the following way:

bootstrap, rep(200) : rd Y X, n(50)

where X=1 if Z>=0 and X=0 if Z<0.

Z takes the values: -12 , -11.5, -11, .... ,-0.5, 0, 0.5, 1, ...,12
Around the cut-off value I have 15-20 observations in each category of Z.

When I run the command I get a lot of bootstrap replications that fail 
(red X). This is more so for binary outcomes! I also tried to use 
-bootstrap, strata(Z) rep(200)-  but the problem remains.

Can someone explain what I do wrong?


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