Transcription of Unit 4 Categorical Data Analysis - UMass
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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? Is more exposure associated with more pleural plaques? Units 2 (Discrete Distributions) and 4 ( Categorical Data Analysis ) pertain to questions such as these and are an introduction to the Analysis of count data that can be represented in a contingency table (a two-way cross-tabulation of the counts of individuals with each profile of traits; eg non-drinker and lung cancer).
Categorical Data Analysis - R Users Page 4 of 78 Nature Population/ Sample Observation/ Data Relationships/ Modeling Analysis/ Synthesis 2. Examples of Categorical Data Source: Fisher LD and Van Belle G. Biostatistics: A Methodology for the Health Sciences New York: John Wiley, 1993, page 235, problem #14.
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