Several coefficients, called divergences, have been suggested in the s
tatistical literature to reflect the fact that some probability distri
butions are ''closer together'' than others and consequently that it m
ay be easier to distinguish between the distributions of one pair than
between those of another. When comparing three biological populations
, it is often interesting to measure how two of them ''move apart'' fr
om the third. Deals with the statistical analysis of this problem by m
eans of bivariate divergence statistics. Provides a unified study, dep
icting the behaviour and relative merits of traditional divergences, b
y using the (h,phi), divergence family of statistics introduced by Men
endez et al.