I have a data frame "data" that looks like this
sub time condition mean
1 40 1 3
1 80 1 2
1 120 1 3
1 160 1 9
1 40 2 12
1 80 2 12
1 120 2 1
1 160 2 23
2 40 1 1
2 80 1 6
2 120 1 23
2 160 1 2
2 40 2 6
2 80 2 3
2 120 2 6
2 160 2 9
I want to get the mean of variable mean for each time point (time) splitted by condition. I tried it with ddply but I couln't work it out: x = ddply(data,.(condition,time), summarize, mean=mean(mean)). Or do I have to rehape the data first? It should look like this:
time condition mean
40 1 2
80 1 1.5
.
.
.
Thankful for any comments or help! Angelika
