Read T.R.C., Cressie N.A.C. Goodness-of-Fit Statistics for Discrete Multivariate Data

New York: Springer, 1988. — 224 p.Introduction to the Power-Divergence Statistic
Defining and Testing Models: Concepts and Examples
Modeling Cross-Classified Categorical Data
Testing the Models: Large-Sample Results
Improving the Accuracy of Tests with Small Sample Size
Comparing the Sensitivity of the Test Statistics
Links with Other Test Statistics and Measures of Divergence
Future Directions
Historical Perspective: Pearson’s X2 and the Loglikelihood Ratio Statistic G2