Function can be used to compare two Zonation output rasters with one of the following functions (part of zonator package):
correlation
substraction
ferquency(NOT IMPLEMENTED)
coverage
comp(x, y, fun = "correlation", ...)
Numeric matrix.
Numeric matrix.
Function used for the numeric comparison.
Further arguments passed on to selected comparison function.
A DataFrame with each row containg columns title, count, and catid
correlation substraction frequency coverage