INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258 The method of path coefficients. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261 The mathematics of path coefficients.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

Students of the literature on entailment [7], [1] are familiar with the von Wright-Geach definition of entailment [6], [2]: p entails q if, and only if, by means of logic, it is possible to come to know the truth of •"/> D cp without coming to know the falsehood of p or the truth of q. A competitor of the Lewis account of entailment as strict implication, the von Wright-Geach definition has enj...

1Wright, S., Genetics, 16, 97-159 (1931). 2 Wright, S., Jour. Genetics, 30, 243-256 (1934). 3Fisher, R. A., Proc. Roy. Soc. Edinburgh, 42, 321-341 (1922). 4Wright, S., Amer. Nat., 63, 556-561 (1929). 5 Fisher, R. A., The Genetical Theory of Natural Selection, Oxford, Clarendon Press, 272 pp. (1930). 6 Fisher, R. A., Proc. Roy. Soc. Edinburgh, 50, 205-220 (1930). 7 Haldane, J. B. S., The Causes ...

The entropy rates of the Wright-Fisher process, the Moran process, and generalizations are computed and used to compare these processes and their dependence on standard evolutionary parameters. Entropy rates are measures of the variation dependent on both short-run and long-run behavior, and allow the relationships between mutation, selection, and population size to be examined. Bounds for the ...