Summarizing Data
Descriptive Statistics
Contents
Introduction & Learning Objectives
Introduction
Learning Objectives
Page 2
Types of Variables
Page 3
Numerical Summaries for Discrete Variables
Frequency Distribution Tables for Dichotomous Variables
Missing Data
Frequency Distribution Tables for Categorical Variables
Frequency Distribution Tables for Ordinal Variables
Page 4
Graphical Summaries for Discrete Variables
Bar Charts for Dichotomous and Categorical Variables
Histograms for Ordinal Variables
Page 5
Descriptive Statistics for Continuous Variables
Sample Mean
Median
Mode
Range
Page 6
Variance and Standard Deviation
Page 7
InterQuartile Range (IQR)
Outliers and Tukey Fences:
Tukey Fences
Page 8
Box-Whisker Plots for Continuous Variables
Page 9
Summary
Page 10
References
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