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myexampleend
2011 Mar 10
1
getting percentiles by factor
...olumn, sortAsc=True) {
# x data.frame/list being analysed
# column to calculate percentiles on
# sortAsc sorting order (True Ascending, False Descending)
w1 <- ecdf(x$column)
w2 <- if (sortAsc) w1(x$column) * 100 else abs(w1(x$column) * 100 - 100)
w3 <- transform(x, myPerc=w2)
return(w3)
}
myExampleEnd2 <- lapply(split(myExample, myExample$Sectors), myecdf2,
column=Ret, sortAsc="True")
myExampleEnd2 <- unsplit(myExampleEnd, myExample$Sectors)
I'm not sure whether I'm going down the right way so any help is
appreciated...also from scratch.
Paolo
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