Hi,
I have a very simple question, but I'm obviously not able to solve the
problem on my own.
I have a data.frame like
sample(c("A","B","C"),size=20,replace = T)->type
rnorm(20)->value
data.frame(ty=type,val=value)->test
There must be some built in functions, that will do some descriptive
statistics with tabular output, in the end I like to have something like
number of samples mean sd .............
A 5
B 9
C 6
So I need a function that counts the number of occurrences of factors in
type and then does something like the *summary* function, but factor
specific.
I tried:
vector()->Median
vector()->SD
vector()->Mean
as.data.frame(table(type))->int
for (count in c(1:(nrow(int))))
{
subset(test, ty==as.character(int$type[count])) -> subtest
median(subtest$val)->Median[count]
sd(subtest$val)->SD[count]
mean(subtest$val)->Mean[count]
}
cbind(int,Median,SD,Mean)
This works, but: isn't this much too complicated, I bet there is such
functionality embedded in the base packages, but I cannot find it.
Maxim
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
