Displaying 2 results from an estimated 2 matches for "27s_method".
2013 Mar 28
2
hierarchical clustering with pearson's coefficient
...lation as distance between observations and
then use any centroid based linkage distance (ex. Ward's distance)
When linkage distances are formed as the Lance-Williams recursive
formulation, they just require the initial distance between observations.
See here: http://en.wikipedia.org/wiki/Ward%27s_method
It is said that you have to use euclidean distance between the initial
observations. However i have found this:
http://research.stowers-institute.org/efg/R/Visualization/cor-cluster/
where they use pearson's correlation for hierarchical clustering.
Any idea if anything is violated in case p...
2012 Oct 31
0
combined dependent pvalue
...5):
fisher.comb <- function (pvalues)
{
df=length(pvalues)
ch2=(-2*sum(log(pvalues)))
return pchisq(ch2, df=df, lower.tail=FALSE)
}
For combination of dependent p-value, I could not find any R code here but
there is a method from Brown
(http://en.wikipedia.org/wiki/Extensions_of_Fisher%27s_method#Brown.27s_method),
in which it is still combine p value in the same way, the only difference is
the Chi square distirbution's variance is different from the previous method
(using the covariance of the p values).
I am not sure how to migrate from the traditional fisher's method to brown...