

PASW Statistics 18 Advanced Statistical Procedures Companion: Chapters
 Model Selection in Loglinear Analysis. Model formulation; parameters in saturated models; hypothesis testing; convergence; goodnessoffit tests; hierarchical models; generating classes; model selection with backward elimination.
 Logit Loglinear Analysis. Dichotomous logit model; loglinear representation; parameter estimates; goodnessoffit statistics; measures of dispersion and association; polychotomous logit model; interpreting parameters; examining residuals; introducing covariates.
 Multinomial Logistic Regression. Baseline logits; likelihoodratio tests for models and individual effects; evaluating the model; calculating predicted probabilities; the classification table; goodnessoffit tests; residuals; pseudo Rsquare measures; overdispersion; model selection; matched casecontrol studies.
 Ordinal Regression. Modeling cumulative counts; parameter estimates; testing for parallel lines; model fit; observed and expected counts; measures of strength of association; classifying cases; link functions; fitting a heteroscedastic probit model; fitting location and scale parameters.
 Probit Regression. Probit and logit response models; confidence intervals for effective dosages; comparing groups; comparing relative potencies; estimating the natural response rate; multiple stimuli.
 KaplanMeier Survival Analysis. Calculating survival time; estimating the survival function, the conditional probability of survival, and the cumulative probability of survival; plotting survival functions; comparing survival functions; stratified comparisons.
 Life Tables. Calculating survival probabilities; assumptions; observations lost to followup; plotting survival functions; comparing survival functions.
 Cox Regression. The model; proportional hazards assumption; coding categorical variables; interpreting the regression coefficients; baseline hazard and cumulative survival rates; global tests of the model; checking the proportional hazards assumption; stratification; logminuslog survival plot; identifying influential cases; examining residuals; partial (Schoenfeld) residuals; martingale residuals; variableselection methods; timedependent covariates; specifying a timedependent covariate; calculating segmented timedependent covariates; testing the proportional hazards assumption with a timedependent covariate; fitting a conditional logistic regression model.
 Variance Components. Factors, effects, and models; model for oneway classification; estimation methods; negative variance estimates; nested design model for twoway classification; univariate repeated measures analysis; using a Mixed Models Approach; distribution assumptions; estimation methods.
 Linear Mixed Models. Background; Unconditional randomeffects models; hierarchical models; randomcoefficient model; model with schoollevel and individuallevel covariates; threelevel hierarchical model; repeated measurements; selecting a residual covariance structure.
 Nonlinear Regression. The nonlinear model; transforming nonlinear models; intrinsically nonlinear models; fitting a logistic population growth model; finding starting values; approximate confidence intervals for the parameters;bootstrapped estimates; starting values from previous analysis; linear approximation; computational issues; common models for nonlinear regression; specifying a segmented model.
 TwoStage LeastSquares Regression. Demandpriceincome economic model; estimation with ordinary least squares; feedback and correlated errors; estimation with twostage least squares.
 Weighted LeastSquares Regression. Diagnosing the problem; estimating weights; examining the loglikelihood function; the WLS solution; estimating weights from replicates; diagnostics from the linear regression procedure.
 Multidimensional Scaling. Data, models, and multidimensional scaling analysis; nature of data analyzed in MDS; measurement level of data; shape of data; conditionality of data; missing data; multivariate data; classical MDS; Euclidean model; details of CMDS; Replicated MDS; Weighted MDS; geometry of the weighted Euclidean model; algebra of the weighted Euclidean model; matrix algebra of the weighted Euclidean model; Weirdness index; flattened weights.


