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...any way to tell tapply() to use the functions mean and sd within one function call? Something like tapply(data$response, list(data$targets, data$conditions), c(mean, sd)). Thanks in advance. -- View this message in context: http://r.789695.n4.nabble.com/Any-way-to-apply-TWO-functions-with-tapply-tp2133924p2133924.html Sent from the R help mailing list archive at Nabble.com.