R function for combining p-values

Question

[elhamdallalbashi]

Is there a base R function that implements fisher's method for combining p-value?I'd rather not use a package.

[WouterDeCoster]

May I ask why you don't want to use packages? Many many functions will only be available through very specific packages, as such best fitting your need.

[Devon Ryan]

That's a trivial function to write yourself.

Answer 1

[Sam]

You can use the metap package. But then if you must, then this should work

pchisq((sum(log(p))*-2), df=length(p)*2, lower.tail=F)

Given p is the list of p-values