Hi - I am working on an analysis in STATA with the cem module that considers four duration groups (treatment groups) and I'd like to balance these 4 groups based on one covariate (number of prior medications). I was able to run the following statement when I consider only two duration groups (dur). In that case, the number of matched observations is reduced to the sum of the smallest number with a given number of prior medications across the duration groups (using the k2k option). However, when I run the statement with the 4 duration groups, the number of matched observations is not reduced, which would make me think that it isn't running correctly or isn't appropriate. Please advise.
cem numpriorbio2 , treatment(dur) k2k noimb
Thank you for your help,
Heather
Heather J. Litman, PhD
Lead Biostatistician
Corrona, LLC.
hlitman(a)corrona.org<mailto:hlitman@corrona.org>
Office Phone: (508) 408-5422
Mobile Phone: (617) 462-6631
Fax: (773) 347-1689
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