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. How do i
extract the midpoint?
You might consider starting with hist() instead. Otherwise, how about
mid <- brk[-1] - diff(brk)/2
where brk is the breakpoints used in cut()
--
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~~~~~~~~~~ - (p.dalga...@biostat.ku.dk) FAX: (+45) 35327907
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