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Institute for Social Research
Statistical Consulting Service
Summer Programme in Data Analysis
June, 2001
Exploratory and Graphical Methods for Data Analysis
Michael Friendly
Lecture Outline
Failures to screen data
Assessing univariate problems
Boxplots and outliers
Transformations to symmetry
Normal probability plots
Assessing bivariate problems
Enhanced scatterplots
Smoothing relations
Transformations to linearity - resitstant lines, Box-Cox
Dealing with heteroscedasticity
Assessing multivariate problems
Multivariate normality
Outliers: univariate, bivariate, multivariate
Robust outlier detection
Dealing with missing data
Strategies for missing data
Simple imputation
Multiple imputation
SAS macro programs, from
SAS System for Statistical Graphics
(Friendly, 1991),
Visualizing Categorical Data
(Friendly, 2000):
http://www.datavis.ca/sasmac/