On 2011-05-23 07:40, Rashid Bakirov wrote:
Hello all R gurus,
I have a following problem which I hope someone will help me to solve.
I have a data.frame in form similar to below.
testframe<-data.frame("Name"=c("aa","aa","aa","aa","aa","bb","bb","bb","bb","bb"),"Value"=c(1,100,1,1,1,100,100,100,100,1))
Name Value
1 aa 1
2 aa 100
3 aa 1
4 aa 1
5 aa 1
6 bb 100
7 bb 100
8 bb 100
9 bb 100
10 bb 1
> > My aim is to find extreme upper whisker of boxplot
(boxplot.stats$stats[5]) of Values
for each unique Name.I wrote the folowing function for this
>
> upex<-function(x){boxplot.stats(subset(testframe, Name==x,
select=Value))$stats[5]}
> When I test with different strings it works correctly> upex("bb")
[... snip ...]
Try the plyr package:
require(plyr)
ddply(testframe, .(Name), function(x) {
boxplot.stats(x[["Value"]])[["stats"]][5]})
Peter Ehlers
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