I've also made some comparisons and taking into account execution
time, sqldf wins. SummaryBy is better then aggregate in some specific
situations I met in practice. I present this situation below. It
assumes, that there are at least two groups with high number of
levels.
n<-10;
grp1<-sample(1
I think I forgot to send the original to the mailing list, so I'm
forwarding it (see below). Sorry about that (and sorry if I did
remember and this is a duplicate). After a few more minutes of
thought, I realized that you should probably make sure that rt, tid,
and mood are also the same in conse
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