[R] bootstrap question

[Erin Hodgess]

Dear r People


I have a bootstrap question, please.

(this may possibly be a problem with my understanding of the bootstrap)

Suppose I have a sample of size 15, x[1], ...x[15].

This is a sample which is small compared to the population.

by the way, the x[i] are iid and have a common distribution F.

As I understand the bootstrap, that function will take a user specified
number of repititions.  In each repitition, each element x[i] has an
equal chance of selection.

Suppose I want to estimate the mean.

In each rep, a new sample is generated.  the mean is calculated in each rep.


I would like to see those means.

If I use the boot command,

boot(x,mean,R=40)$t

I thought that I would obtain 40 different values.  However, those $t values
are all the same.

what am I doing wrong, please?

thanks yet again!

sincerely,
Erin Hodgess
mailto: hodgess at uhddx01.dt.uh.edu