Dear r-help reader,
I have some problems with the aggregate function.
My datframe looks like
>frame
Day Time V1 V2
1 M 0 3 NA
2 M 0 4 NA
3 M 0 5 2
4 M 1 NA 4
5 M 1 10 6
6 T 0 4 45
7 T 1 4 3
8 T 1 3 2
9 T 1 6 1
I used the aggegate function to obtain the mean in V1 and V2 over the
grouping variable
Time and Day
aggregate(frame[,c(-1)],list(frame$Day,frame$Time),mean)
Group.1 Group.2 Time V1 V2
1 M 0 0 4.000000 NA
2 T 0 0 4.000000 45
3 M 1 1 NA 5
4 T 1 1 4.333333 2
>
My problem is now that I do not obtain a 'mean' for Day=M/Time=0 and
Day=M/Time=1,
because aggregate ignores all values for a grouping variable if NA
occurs.
I'm now hoping for some help so that the mean is still calculated in
this group.
My table should look like:
aggregate(frame[,c(-1)],list(frame$Day,frame$Time),mean)
Group.1 Group.2 Time V1 V2
1 M 0 0 4.000000 2
2 T 0 0 4.000000 45
3 M 1 1 10 5
4 T 1 1 4.333333 2
>
I hope my description makes sense and appreciate any help.
Yours
Frank
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