By Ronald Christensen

This e-book examines statistical versions for frequency info. the first concentration is on log-linear versions for contingency tables, yet during this moment version, higher emphasis has been put on logistic regression. issues corresponding to logistic discrimination and generalized linear types also are explored. The therapy is designed for college students with previous wisdom of study of variance and regression. It builds upon theRead more...

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**Extra info for Log-linear models and logistic regression**

**Sample text**

This is described as testing for homogeneity of proportions. We continue to use Pearson’s chi-square test statistic to evaluate the appropriateness of the null hypothesis model. Pearson’s chi-square requires estimates of the expected values mij . Each sample i has a multinomial distribution with ni· trials, so mij = ni· pij . If H0 is true, pij is the same for all values of i. A pooled estimate of the common value of the pij ’s is (0) pˆij = n·j /n·· . In other words, if all the populations have the same probability for category j, an estimate of this common probability is the total number of observations in category j divided by the overall total number of observations.

Similarly, a sample from one population that is categorized by two factors can be generalized beyond the case considered in Section 2. We allow one factor to have I categories and the other factor to have J categories. Between the two factors, the population is divided into a total of IJ categories. The distribution of counts within the IJ categories is assumed 34 2. Two-Dimensional Tables and Simple Logistic Regression to have a multinomial distribution. Consequently, this sampling scheme is multinomial sampling.

An excellent discussion of the likelihood principle is given by Berger and Wolpert (1984). Although formal tests are conducted throughout this book, the real emphasis is on informal evaluation of models using G2 and other tools. The emphasis is on modeling and data analysis, not formal inferential procedures. Nevertheless, a relatively complete account is given of the standard results in formal log-linear model methodology. Bayesian methods are the primary inferential methods that satisfy the likelihood principle.