Solomon Kullback, Ph.D., Professor Emeritus in the Department of Statistics at George Washington University, is one of America's mathematical and cryptanalytic "greats." This classic text provides various statistical the Chi Test, which affords a quantitative measure of the degree of similarity between two distributions, and the Phi Test, which provides a quantitative measurement of the degree of non-randomness of a distribution. Text includes numerous tabulations of frequency data in other languages.