Unit 4 Categorical Data Analysis - UMass

BIOSTATS 640 - Spring 2020 4. Categorical data Analysis - R Users Page 1 of 78 Nature Population/ Sample Observation/ data Relationships/ Modeling Analysis / Synthesis Unit 4 Categorical data Analysis Don t ask what it means, but rather how it is used - L. Wittgenstein Is frequency of exercise associated with better health? Is the proportion of adults who visit their doctor more than once a year, significantly lower among the frequent exercisers than among the non-exercisers? Is alcohol associated with higher risk of lung cancer? Is the apparent association misleading because we have failed to account for the relationship between drinking and smoking? Is greater exposure to asbestos associated with the development of pleural plaques?

Data that are counts are categorical data. A categorical variable is measured on a scale that is nominal (eg – religion) or ordinal (eg – diagnosis coded as “benign”, “suspicious”, or “malignant”). Unit 4 (Categorical Data Analysis) is an introduction to some basic methods for the

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  Analysis, Data, Categorical, Categorical data analysis, Categorical data

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