Hello list:
I am using cut and table to obtain a frequency table from a numeric sample
vector. The idea is to calculate mean and standard deviation on grouped data.
However, I can't extract the midpoints of the class intervals, which seem to be
strings treated as factors. How do i extract
Hi,
Maybe something like this (inspired by ?cut),
cut2num - function(f){
labs - levels(f)
d - data.frame(lower = as.numeric( sub(\\((.+),.*, \\1, labs) ),
upper = as.numeric( sub([^,]*,([^]]*)\\], \\1, labs) ))
d$midpoints - rowMeans(d)
d
}
a - c(1, 2, 3, 4, 5, 2, 3,
jose romero wrote:
Hello list:
I am using cut and table to obtain a frequency table from a
numeric sample vector. The idea is to calculate mean and standard
deviation on grouped data. However, I can't extract the midpoints of the
class intervals, which seem to be strings treated as factors.
Try this:
library(gsubfn)
demo(gsubfn-cut)
and note the strapply call that converts the levels from cut to a matrix.
On Sun, Nov 8, 2009 at 4:08 PM, jose romero jlauren...@yahoo.com wrote:
Hello list:
I am using cut and table to obtain a frequency table from a numeric
sample vector. The
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