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...ng to the variable "Date" and "trade_day" I tried: split(x,f=list(a=x$Date,b=x$trade_day)), but it doesn't work. How can I solve this problem? Thanks advance Ted -- View this message in context: http://n4.nabble.com/How-to-split-data-frame-into-groups-by-a-list-of-factors-tp1458171p1458171.html Sent from the R help mailing list archive at Nabble.com.