Dear Elahe
In line
On 16/05/2016 13:31, ch.elahe via R-help wrote:
Hi all,
I have a column in my df and I want to get quartiles for this column and then
calculate mean for each and every quartile, here is my column:
The quartiles are strictly speaking the boundaries but if you really
meant that the problem is trivial so i assume you want to cut the
variable at the quartiles.
df$BR
[1] 384 384 384 384 512 384 384 320 320 320 320 320 320 320 320 320 320 384
[19] 384 384 320 320 320 320 384 384 256 320 320 320 384 320 320 320 384 384
[37] 320 320 320 320 320 320 320 320 320 384 320 320 320 320 320 320 384 320
[55] 320 320 320 320 320 320 384 512 320 320 320 320 320 320 320 384 384 320
[73] 320 320 384 320 320 320 320 256 320 320 384 320 384 320 384 320 320 320
[91] 384 320 320 320 320 320 320 320 320 320 320 320
I do the following to get the quartiles:
quantile(m$BR)
0% 25% 50% 75% 100%
256 320 320 368 512
now how can I get mean for each quartile?
How about setting up a vector which takes the values 1, 2, 3, 4
depending on the values of BR with cutpoints defined by
quantile(BR)(using ifelse) and then using tapply?
Thnaks for any help,
Elahe
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Michael
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