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Re: st: Error after using RD command


From   Austin Nichols <austinnichols@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Error after using RD command
Date   Tue, 9 Aug 2011 15:06:02 -0400

sherry <shirins@email.arizona.edu>:
You may have a small number of observations within the specified
bandwidth, effectively estimating a linear regression on one side of
the discontinuity using one or two observations.  Check your data.
You may want to use a wider bandwidth.  Or better, acquire more data.

Note that -rd- is from SSC and the Statalist FAQ advises you to give
the provenance of user-written commands.

On Tue, Aug 9, 2011 at 1:20 PM, sherry <shirins@email.arizona.edu> wrote:
> Hi all,
>
> I have used RD command and for two bandwidths, I have received the following
> error:
>
> using -ivreg- to estimate due to failure of -suest-
>
> In the result box the estimators for numerator and denominator and also the
> ratio are reported as omitted.
> Do you know what may cause such problem and is there anyway that I fix it?
>
> Thanks,
> Sherry
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