search for: week1tabl

...variables for in example 4weeks and want to do aggregations, like mean standard , deviation etc.. With mean it works but how i can calculate the standard deviation for the 4weeks and for every ID. many thanks & regards, christian week1 <- grep("(_PRO_001)",names(dmx3),perl=T) week1table <- subset(dmx3,select=c(ID,week1)) week2 <- grep("(_PRO_002)",names(dmx3),perl=T) week2table <- subset(dmx3,select=c(ID,week2)) week3 <- grep("(_PRO_003)",names(dmx3),perl=T) week3table <- subset(dmx3,select=c(ID,week3)) week4 <- grep("(_PRO_004)"...