==Insensitivity to the type of sampling==If the data form a "population sample", then the cell probabilities "p"̂"ij" are interpreted as the frequencies of each of the four groups in the population as defined by their "X" and "Y" values.
== Insensitivity to the type of sampling ==If the data form a "population sample", then the cell probabilities "p"̂"ij" are interpreted as the frequencies of each of the four groups in the population as defined by their "X" and "Y" values.