Hello everybody,
I would like to calculate the median for each factor combination, with only one
value per factor combination as an output.
Could anybody help me?
For example:
# make table
g<-1:2
group<-rep(g, each=5)
session<-c(1,1,2,2,2,1,1,1,2,2)
rt<-seq(length=10,300, 800)
rt<-round(rt, digits=2)
table<-data.frame(group, session, rt)
table
group session rt
1 1 1 300.00
2 1 1 355.56
3 1 2 411.11
4 1 2 466.67
5 1 2 522.22
6 2 1 577.78
7 2 1 633.33
8 2 1 688.89
9 2 2 744.44
10 2 2 800.00
Besides others I tried the following:
median<-ave(rt, group, session, FUN=median)
median<-frameApply(table,by=c("group", "session"), on="rt", fun=median)
I would appreciate your help a lot.
Marianne
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