tapply on multiple groups
Thanks. My mistake was that I used c(dbs.final$Days,dbs.final$Place) instead of list(... when I tried to follow that part of the documentation.
David Winsemius <dwinsemius at comcast.net> 1/28/2010 11:49 AM >>>
On Jan 28, 2010, at 10:26 AM, GL wrote:
Can you make tapply break down groups similar to bwplot or such? Example: Data frame has one measure (Days) and two Dimensions (YYYYMM and Place). All have the same length.
length(dbs.final$Days)
[1] 3306
length()
[1] 3306
length()
[1] 3306 Doing the following makes a nice table for one dimension and one measure: do.call(rbind,tapply(dbs.final$Days,dbs.final$Place, summary)) But, what I really need to do is break it down on two dimensions and one measures - effectively equivalent to the following bwplot call: bwplot( Days ~ YYYYMM | Place, ,data=dbs.final) Is there an equivalent to the "|" operation in tapply?
Please reread the help page for tapply. Perhaps?: tapply(dbs.final$Days, list(dbs.final$YYYYMM, dbs.final$Place) summary) -- David
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David Winsemius, MD Heritage Laboratories West Hartford, CT