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...RUE observations based on another 2 factor variable. I'm assuming this is possible, but I don't know what I'm doing wrong, as I get results that obviously aren't correct. Many thanks, Paul twin.wide$a<-twin.wide$RCCT<600 & twin.wide$RCCT>480 twin.wide$b<-twin.wide$LCCT<600 & twin.wide$LCCT>480 selVarsCCT <- with(twin.wide,c('a','b')) MZCCT <- subset(twin.wide,Zygosity=='MZ',selVarsCCT) DZCCT <- subset(twin.wide,Zygosity=='DZ',selVarsCCT) -- View this message in context: http://n4.nabble.com/Exclude-data-using-...