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:

Page 8
Box-Whisker Plots for Continuous Variables

Page 9
Summary

Page 10
References

Content ©2016. All Rights Reserved.
Date last modified: May 17, 2016.
Created by Lisa Sullivan, PhD and Wayne W. LaMorte, MD, PhD, MPH,

Boston University School of Public Health