multilevel
I see.. Row1 of Table 2 gives averages for category 3 in the group with a zero in cols 6-8 AND col 2. I wanted to averages for category 3 in the group with a zero in cols 6-8 and a 1 in col 2. I still think its suspicious that cols V1 and V2 in Table 1 are the same. -- View this message in context: http://r.789695.n4.nabble.com/possible-bug-in-aggregate-tp3539421p3542084.html Sent from the R help mailing list archive at Nabble.com.