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st: RE: bootstrap gives errors with -rd-
From
Nick Cox <[email protected]>
To
"'[email protected]'" <[email protected]>
Subject
st: RE: bootstrap gives errors with -rd-
Date
Fri, 11 Nov 2011 19:09:38 +0000
... and -rd- is ?
Nick
[email protected]
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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