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Use this tag for any *on-topic* question that (a) involves `R` either as a critical part of the question or expected answer, & (b) is not *just* about how to use `R`.

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Make sure you have the "MatchIt" package loaded: library(MatchIt) Usually that error pops up when you don't have the required package loaded. Check the help file if you need more info on the functi …
answered Feb 24 '16 by maxwelldeux