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 dwinsem...@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 (MM 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$Place, summary))
But, what I really need to do is break it down on two dimensions and
one
measures - effectively equivalent to the following bwplot call:
bwplot( Days ~ MM | Place, ,data=dbs.final)
Is there an equivalent to the | operation in tapply?
Please reread the help page for tapply.
Perhaps?:
tapply(dbs.final$Days, list(dbs.final$MM, dbs.final$Place) summary)
-- David
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David Winsemius, MD
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