Phi coefficient matrix (package psych)
HI Kumar,
A simple way is:
phimat<-function(x) {
xcol<-dim(x)[2]
newx<-matrix(NA,nrow=xcol,ncol=xcol)
for(i in 1:xcol) {
for(j in 1:xcol) newx[i,j]<-phi(table(x[,i],x[,j]))
}
rownames(newx)<-colnames(newx)<-colnames(x)
return(newx)
}
phimat(df)
Jim
On Wed, Apr 22, 2015 at 6:34 AM, Kumar Mainali <kpmainali at gmail.com> wrote:
I want to calculate phi coefficient for every pair of the columns. Is there
a way to generate a matrix like a correlation matrix? I know cor function
in the case below gives same answer as phi coefficient.
x <- sample(c(0,1), 10, replace=TRUE)
y <- sample(c(0,1), 10, replace=TRUE)
z <- sample(c(0,1), 10, replace=TRUE)
df <- data.frame(x,y,z)
cor(df)
library(psych)
phi(df)
Thank you,
Kumar Mainali
Postdoctoral Associate
Department of Biology
University of Maryland
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