Displaying 3 results from an estimated 3 matches for "bskeller".
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bsbkeller
2010 Apr 26
0
Permutation tests using apply function with package coin
I am using "apply" to run exact permutation t-tests by columns
using the coin package. For example:
library(coin)
dat <- matrix(rnorm(7*35),7,35)
fun <- function(x) {
pvalue( independence_test(x~f,
data=data.frame(x, f=factor(c(rep("a",4),rep("b",3)))),
distribution = "exact"))
}
p.vals <- apply(dat, 2, fun)
Some small-scale
2009 Sep 03
2
Recursion is slow
The following recursion is about 120 times faster in C#. I know R is not known for its speed with recursions but I'm wondering if anyone has a tip about how to speed things up in R.
#"T" is a vector and "m" is a number between 1 and sum(T)
A <- function(T,m) {
lt <- length(T)
if (lt == 1) {
if (0 <= m & m <= T[1]) {
return(1)
} else {
return(0)
}
2010 May 30
2
Question about package coin
Anyone know if coin can run a permutation test based on a (user-defined) statistic other than the mean difference? The function independence_test does the permutation t-test via difference in means. I'm wondering if it's possible to use independence_test to run a permutation test for some other statistic than the difference in means. For example, I'd like to run a permutation test