Hi, I'm trying to use Pearson's Chi-squared to verify the dependence among species distribuion.
I have a dataframe with the presence/absence data of two species in a number of sample units The equation I'm using is: X2= p*(|ad-bc|-p/2)^2 / ((a+b)*(c+d)*(a+c)*(b+d)) where a is the number of double presence (1-1), b is the number of 1-0, c is the number of 0-1 and d is the number of 0,0 (double absence) p is a+b+c+d Is there a function to caltulate it using R? I could not understand how to use chisq.test function for this. Thanks in advance. Antonio Olinto [[alternative HTML version deleted]] _______________________________________________ R-sig-ecology mailing list R-sig-ecology@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-ecology