Re: st: One to N matching

[Richard Goldstein <richgold@ix.netcom.com>]

for already existing programs, rather than writing your own, I would 
start with -vmatch- (user-written, type -findit vmatch-)

I'm not sure it will cover your last criterion (used only once) but if 
not it should be easy to eliminate those

Rich

Gao Liu wrote:
> Dear Statlist:
>
> I have a question about one to N matching.
>
> I have a dataset containing three variables: id, score, case, where
> case is a dummy variable indicating whether or not the observation is
> in the case group. How can I match each case observation to N non-case
> observation based on the score?  Each case observation matches to the
> N non-case observations with the closest scores, but no case
> observation can match the same observation (i.e. the non-case
> observation can be used only one time).
>
> Thank you
>
> Best
>
> Gao
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/