Learn R Toolkit
Module 5
Box, Dot, Histogram, Strip Charts
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Box, Dot, Histogram , Strip Charts
Mod 5 –Box Charts: 1
Learn R Toolkit
Module 5
Box, Dot, Histogram, Strip Charts
Do
Learn
See & Hear
D Kelly O'Day
Box, Dot, Histogram , Strip Charts
Read
Mod 5 –Box Charts: 2
Learn R Toolkit
Making Box, Dot, Histogram, Strip Charts
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Box, Dot, Histogram , Strip Charts
Mod 5 –Box Charts: 3
Learn R Toolkit
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Overview of R Charting
High Level Plot Functions Arguments
Produce complete chart
Type
Bar Chart
barplot()
Box & Whisker Plot
boxplot()
Dot Plot
dotchartt()
Histogram
type=
type = “p” – individual points
type = “l” – line
type = “b” – points connected with lines
type = “h” – vertical lines from 0
type = “s” – step chart
xlab = “ “
ylab = “ “
X and Y axis titles
main = “ “
sub = “ “
Figure title top of plot, large font
Sub title – below X axis, smaller font
axes = Tor F
Set to F when you want custom axis
hist()
Scatter Plot
plot()
Strip Chart
stripchart()
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High Level Function Arguments
R function()
Box, Dot, Histogram , Strip Charts
Mod 5 –Box Charts: 4
Learn R Toolkit
Module 5 Box, Dot, Histogram, Strip Charts
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Box Plot
Dot Plot
Histogram
Strip Chart
D Kelly O'Day
Box, Dot, Histogram , Strip Charts
Mod 5 –Box Charts: 5
Learn R Toolkit
Making a Box & Whisker Plot with
boxplot() Function
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boxplot()
boxplot(?? ~ ??, data = ??,
col = “??", horizontal = ??,
par(cex = 0.??),whisklty=??,
outline = ??, boxcol = “??",
boxwex = ??, border = “??", pch = ??,
outcol = “??, main = ??)
Data File: C:\\Learn_R\\Mod_4_R_Charts\\iris_data.txt
"Sepal.L","Sepal.W","Petal.L","Petal.W","Species"
5.1,3.5,1.4,0.2,"setosa“
4.9,3,1.4,0.2,"setosa“
4.7,3.2,1.3,0.2,"setosa“
4.6,3.1,1.5,0.2,"setosa“
5,3.6,1.4,0.2,"setosa“
5.4,3.9,1.7,0.4,"setosa"
R’s Iris flower data set copied to text file
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boxplot(Sepal.W ~ Species, data = my_data,
col = "grey", horizontal = FALSE,
par(cex = 0.7),whisklty=1,
outline = TRUE, boxcol = "grey",
boxwex = 0.5, border = "darkgrey", pch = 16,
outcol = "red", main = Title)
Box, Dot, Histogram , Strip Charts
Mod 5 –Box Charts: 6
Learn R Toolkit
Box plot with All Points
• R lets you add low level graphics to a plot
• Show all points on box plot
boxplot(Sepal.L ~ Species, data = my_data,
col = "blue", horizontal = FALSE,
par(cex = 0.65),whisklty=1,
outline = TRUE, boxfill = "grey",
boxwex = 0.5, border = "darkgrey", pch = 16,
outcex = 1.25, outcol = "red", main = Title)
points(my_data$Sepal.L~my_data$Species, pch=16, col="red")
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Box, Dot, Histogram , Strip Charts
Mod 5 –Box Charts: 7
Learn R Toolkit
Assignment 5-1
Make a Box plot
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Make your own box plot like this
Notice horizontal orientation, line
style and blue color
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#################### Box_plot_assign.R ###################
##Script to produce assignment box plot
## STEP 1: SETUP & Source File
rm(list=ls())
oldpar<- par(no.readonly=T)
par(las=1); par(oma=c(2,4,0,2)); par(mar=c(3,3,3,1))
script <- "C:/Learn_R/Mod_5_box_dot_hist_charts/Practice_5_1_Bo
link <- "C:\\Learn_R\\Mod_5_Box_Dot_Hist_Charts\\iris_data.txt"
## STEP 2: READ DATA
my_data <- read.table(link, sep = ",", dec=".", skip = 0,
row.names = NULL, header = TRUE,
colClasses = c(rep("numeric", 4), "factor"),
na.strings = c("", "*", "-", -99.99,99.9, 999.9))
## STEP 3: MANIPULATE DATA
Title <- "Iris Flower Data Set: Petal Length"
## STEP 4: CREATE PLOT
boxplot(Petal.L ~ Species, data = my_data,
col = "blue", horizontal = TRUE,
cex = 0.65,whisklty=5, outline = TRUE, boxcol = "grey",
boxwex = 0.5, border = "darkgrey", pch = 16,
outcex = 1., outcol = "red", main = Title)
## Outer margin annotation
my_date <- format(Sys.time(), "%m/%d/%y")
mtext(script, side = 1, line = .5, cex=0.7, outer = T, adj = 0)
mtext(my_date, side = 1, line =.5, cex = 0.7, outer = T, adj = 1)
## STEP 5: CLOSE
par(oldpar)
Box, Dot, Histogram , Strip Charts
Mod 5 –Box Charts: 8
Learn R Toolkit
Making a Dot Plot with
dotchart() Function
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Menu
Dot plots developed by William
Cleveland
Alternative to bar charts
X axis displays measurement
Y axis displays categorical label
Data File:C:\Learn_R\Mod_5_Box_Dot_Hist_Charts\dot_plot_data.txt
Dotchart()
dotchart(??, labels = ??,
groups = ??, main = “??",
xlab = "??",
pch = ??, col = "??",
lcolor = ??, gcolor = ??)
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Box, Dot, Histogram , Strip Charts
Mod 5 –Box Charts: 9
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Dot Plot Scripts
Simple & Grouped
Simple Dot Plot
Grouped Dot Plot
dotchart(Quad_BTU, labels = Fuel,
main = Title, xlab = "Quadrillion BTU",
pch = 16, col = "blue", lcolor = NULL)
text(5,0.5, cex=0.65, pos=4, Source)
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dotchart(Quad_BTU, labels = Fuel, groups = Type,
main = Title, xlab = "Quadrillion BTU",
pch = 16, col = "blue", lcolor = NULL, gcolor = “red“ )
text(5,0.5, cex=0.65, pos=4, Source)
Box, Dot, Histogram , Strip Charts
Mod 5 –Box Charts:
10
Learn R Toolkit
Assignment 5-2
Dot Plot
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Menu
Start with script
C:/Learn_R/Mod_5_Box_Dot_Hist_Charts/Dot_plot_Simple_example.R
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Make your own dot plot like this
Use dot_plot_data.txt for source data
Notice Y axis grid lines with grey color
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dotchart(Quad_BTU, labels = Fuel,
main = Title, cex = 0.7,
xlab = "Quadrillion BTU",
pch = 16, col = "blue",
lcolor = NULL)
text(5,0.5, cex=0.65, pos=4, Source)
grid(nx=0, ny=10,col = "grey")
Box, Dot, Histogram , Strip Charts
Mod 5 –Box Charts:
11
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Making a Histogram with
hist() Function
hist(my_scores, freq = T, breaks = 10,border="black",
labels=T, xlim = c(8, 20), ylim = c(0,12), col = "darkgrey",
xlab = "Exam Score",
ylab= "Number of Students",cex.main=t_par,
main = "Histogram of Exam Results: \n
Score out of possible 20 points")
axis(1, at=seq(8, 20, 1))
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Box, Dot, Histogram , Strip Charts
Mod 5 –Box Charts:
12
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Making a Histogram with
hist() Function
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Enhancing a histogram:
– Histogram w/ counts
– Distribution
– Median line
– Counts <> Median
– Summary Stats in Note
D Kelly O'Day
Box, Dot, Histogram , Strip Charts
Mod 5 –Box Charts:
13
Learn R Toolkit
Making a Strip Chart with
stripchart() Function
stripchart(Sepal.L ~ Species, data = my_data,
col = "grey", main = Title, font.main=2,
vertical = T, pch = 16, font.axis = 1,cex=1.,
cex.main = 1.2, cex.axis = 1.1)
D Kelly O'Day
Box, Dot, Histogram , Strip Charts
Mod 5 –Box Charts:
14