Annie,
If I understand what you are asking, you want to sample some number of
observations, with replacement, then find the mean of x and y for those
observations.
In this case, you would want to sample the row indices instead of the
values. For example,
#test data
set.seed(1)
df <- data.frame(x = rnorm(100), y = rnorm(100))
#sample from row indices
samp <- sample(nrow(df), 25, replace = TRUE)
#get means for x and y
mean(df[samp,]$x)
mean(df[samp,]$y)
#or
mean(df[samp,])
Greg
On 1/11/10 9:42 AM, luciferyan wrote:
Hello, I have 49 paired data, x, y.
I have sampled x (where replacement is true), and find its mean.
How can I find the corresponding mean y, which is the paired data of above
sample x?
Thank you very much,
Annie
--
Greg Hirson
ghir...@ucdavis.edu
Graduate Student
Agricultural and Environmental Chemistry
1106 Robert Mondavi Institute North
One Shields Avenue
Davis, CA 95616
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