I am testing the correlation between two physiological parameters in plants using the pic function in R. I am a bit stuck on the interpretation of the phylogenetic independent contrast (PIC). Without considering the PIC, I got a significant correlation, but there is no correlation between the PIC. What does the absence of correlation between the PIC mean:
- the correlation without PIC is the effect of phylogeny
- There is no phylogenetic effect on the correlation.