SOC 4930 & SOC 5050 - Week 02, Lecture 02a

Lecture slides for Week 02, Lecture 02a of the Saint Louis University Course Quantitative Analysis: Applied Inferential Statistics. These slides cover the basics of the R package ggplot2.

Transcript

1. INTRODUCING GGPLOT2 QUANTITATIVE ANALYSIS CHRISTOPHER PRENER, PHD FALL, 2017 WEEK 02 LECTURE 02A
2. AGENDA QUANTITATIVE ANALYSIS / WEEK 02 / LECTURE 02A 1. ggplot Basics 2. Geometric Objects 3. The Plots Tab
3. GGPLOT BASICS 1
4. 1. GGPLOT BASICS ▸ A core package of the tidyverse used for both exploratory data analysis and production of final plots ▸ Not the only way to make plots in R but absolutely the best way ▸ One of the reasons R is so attractive to end users GGPLOT2
5. 1. GGPLOT BASICS BASIC FUNCTION ggplot(data = dataFrame) Example - the mpg data from ggplot2: ggplot(data = mpg) This will produce an empty plot!
6. 1. GGPLOT BASICS BASIC FUNCTION + GEOMETRIC OBJECT ggplot(data = dataFrame) + geom(mapping = aes(aesthetic)) Example - the mpg data from ggplot2: ggplot(data = mpg) + geom_histogram(mapping = aes(hwy)) This geom is for use with one continuous variable
7. 1. GGPLOT BASICS BASIC FUNCTION + GEOMETRIC OBJECT
8. GEOMETRIC OBJECTS 2
9. ggplot(data = dataFrame) + geom_freqpoly(mapping = aes(aesthetic)) Example - the mpg data from ggplot2: ggplot(data = mpg) + geom_freqpoly(mapping = aes(hwy)) This geom is for use with one continuous variable 2. GEOMETRIC OBJECTS LINE PLOTS
10. 2. GEOMETRIC OBJECTS LINE PLOTS
11. 2. GEOMETRIC OBJECTS BAR PLOTS ggplot(data = dataFrame) + geom_bar(mapping = aes(aesthetic)) Example - the mpg data from ggplot2: ggplot(data = mpg) + geom_bar(mapping = aes(class)) This geom is for use with one discrete variable
12. 2. GEOMETRIC OBJECTS BAR PLOTS
13. 2. GEOMETRIC OBJECTS SCATTER PLOTS ggplot(data = dataFrame) + geom_point(mapping = aes(x = var1, y = var2)) Example - the mpg data from ggplot2: ggplot(data = mpg) + geom_point(mapping = aes(x = displ, y = hwy)) This geom is for use with two continuous variables
14. 2. GEOMETRIC OBJECTS SCATTER PLOTS
15. 2. GEOMETRIC OBJECTS SMOOTHED LINES ggplot(data = dataFrame) + geom_smooth(mapping = aes(x = var1, y = var2)) Example - the mpg data from ggplot2: ggplot(data = mpg) + geom_smooth(mapping = aes(x = displ, y = hwy)) This geom is for use with two continuous variables
16. 2. GEOMETRIC OBJECTS SMOOTHED LINES
17. 2. GEOMETRIC OBJECTS BOX PLOTS ggplot(data = dataFrame) + geom_boxplot(mapping = aes(x = var1, y = var2)) Example - the mpg data from ggplot2: ggplot(data = mpg) + geom_boxplot(mapping = aes(x = class, y = hwy)) This geom is for use with one discrete and one continuous variable
18. 2. GEOMETRIC OBJECTS BOX PLOTS
19. THE PLOTS TAB 3