[R] Newbie: how to calculate group averagege?
Sven Garbade
garbade at psy.uni-muenchen.de
Mon Apr 10 12:58:25 CEST 2000
Dear R-List,
I´m new in R, so I hope my question is not to primitive, but I haven´t
found a solution in the R-help. I´ve got a datatframe with 3 factors,
called xf (9 levels), yf (9 levels), zf (3 levels) and one variable
(rt):
> xf yf zf rt
> 1 1 1 67
> 1 1 1 56
> 1 1 1 60
[...]
> 1 1 2 58
> 1 1 2 61
[...]
> 9 1 1 62
> 9 1 1 65
[...]
> 9 9 3 70
For each combinations of the factors are 6 values of rt. I need the mean
of the six rt values for each factor combination. I´ve tried the ave()
function:
> ave(rt, zf, xf, yf)
but it returns a lot of NAs. Is there another r-function I´ve overlooked
or must I write my own function?
Thanks,
Sven
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
More information about the R-help
mailing list