The Analysis of Categorical Data. Categorical variables. When both predictor and response variables are categorical: Presence or absence Color, etc. The data in such a study represents counts –or frequencies - of observations in each category. Analysis. Two way Contingency Tables.
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Sex * Death Crosstabulation
Sex * Marrow Crosstabulation
Death * Marrow Crosstabulation
We want to know, for example, whether males are more likely to die by predation than females
Because we have no other information than the data, we estimate the probabilities of each of the right hand terms from the equation from the marginal totals
Sex * Death expected values
= 0.0866, P=0.7685
= 0.0253, P=0.8736
Death and marrow have a partial association