## Questions on categorical data analysis

How do I explain adding 0.5 to the cells for the odds ratio, d' (dprime) or logit transform?

What is heterogeneity of variance in SPSS Probit and Logit (and Poisson) Regressions?

What is overdispersion in handling proportions or count data and how do I handle it?

How do I perform tests of Marginal Homogeneity between two raters measuring the same items?

When should I use a logit analysis as opposed to an arcsine transformed ANOVA?

How do I do a matched pairs comparison on dichotomous data using covariates in SPSS?

How do I get SPSS to do a Chi-squared analysis of a two-way frequency table?

How do I compare a list of observed frequencies with a list of my own expected frequencies?

Using a chi-square to see if two or more proportions are equal

How do I know which elements contribute to a relationship in a two-way frequency table?

When do I use the correction for continuity when performing a chi-square analysis on a 2x2 table?

How do I do a linear trend of proportions in a Chi-squared analysis in SPSS?

How do I test for the presence of an unknown ordering across subjects using 2 Dimensional data?

Improved Confidence Limits for a binomial proportion and differences in binomial proportions

How do I compare observed numbers correct to those expected by chance in a multi-choice task?

How do I compute a leaving-one-out error rate for a logistic regression in SPSS?

Why are the standard errors so large in logistic regression?

How do I choose between different logistic regression models?

How do I interpret output from a Multinomial logistic regression?

How do I plot and interpret a ROC curve in assessing strength in two group prediction?