the Matching() package by Jasjeet Sekhon does propensity score matching in a very user friendly way. (as you said you don't want to reinvent the wheel...) just feed it with the fitted values from a glm model (fitted$myglmmodel). afaik, you may additionally match on some covariates directly. HTH marc _________________________________________________________________________ In 5 Schritten zur eigenen Homepage. Jetzt Domain sichern und gestalten!
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