Contents
The R Console and Command Prompt
Chapter 2: Working with Data Files
Importing Files from Other Software
Chapter 3: Preparing and Manipulating Your Data
Rearranging and Removing Variables
Calculating New Numeric Variables
Dividing a Continuous Variable into Categories
Manipulating Character Variables
Concatenating Character Strings
Searching a Character Variable
Adding and Removing Observations
Removing Specific Observations
Removing Duplicate Observations
Selecting a Subset of the Data
Selecting a Subset According to Selection Criteria
Selecting a Random Sample from a Dataset
Chapter 4: Combining and Restructuring Datasets
Merging Datasets by Common Variables
Stacking and Unstacking a Dataset
Chapter 5: Summary Statistics for Continuous Variables
Pearson’s Correlation Coefficient
Spearman’s Rank Correlation Coefficient
Hypothesis Test of Correlation
Comparing a Sample with a Specified Distribution
Confidence Intervals and Prediction Intervals
Creating Tables from Count Data
Chi-Square Goodness-of-Fit Test
Tests of Association Between Categorical Variables
Chi-Square Test of Association
Chapter 7: Probability Distributions
Probability Distributions in R
Probability Density Functions and Probability Mass Functions
Chapter 9: Customizing Your Plots
Adding a Mathematical Function Curve
Multiple Plots in the Plotting Area
Changing the Default Plot Settings
Chapter 10: Hypothesis Testing
Pairwise Wilcoxon Rank-Sum Tests
Chapter 11: Regression and General Linear Models
Stepwise Model Selection Procedures
Assessing the Fit of the Model
Viewing a List of Available Add-on Packages
Installing and Loading Add-On Packages