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Data Wrangling and Analysis
 The Tidyverse
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 select()
 mutate()
 filter()
 summarize()
 group_by() and summarize()
 arrange()
 Create a New Data Frame
 Bring it All Together (Data Wrangling)

Data Visualization
 The Grammar of Graphics
 Scatterplots
 Histograms
 Bar Charts
 Setting color and fill Aesthetic Properties
 Setting color and fill Scales
 Setting x and y Scales
 Adding Text to Plots
 Plot Labels
 Themes
 Facets
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 Bring it All Together (Data Visualization)

Quarto
 Quarto Overview
 YAML
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 Code Chunks
 Tips for Working with Quarto
 Bring It All Together (Quarto)

Wrapping Up
 An Important Workflow Tip
Fundamentals of R
Histograms
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This lesson is called Histograms, part of the Fundamentals of R course. This lesson is called Histograms, part of the Fundamentals of R course.
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# Load Packages 
library(tidyverse)
# Import Data 
penguins < read_csv("penguins.csv")
# Histograms 
# We use geom_histogram() to make a histogram.
ggplot(data = penguins,
mapping = aes(x = bill_length_mm)) +
geom_histogram()
# How does ggplot know what to plot on the y axis?
# It's using the default statistical transformation for geom_histogram,
# which is stat = "bin".
# If we add stat = "bin" we get the same thing.
# Each geom has a default stat.
ggplot(data = penguins,
mapping = aes(x = bill_length_mm)) +
geom_histogram(stat = "bin")
# We can adjust the number of bins using the bins argument.
ggplot(data = penguins,
mapping = aes(x = bill_length_mm)) +
geom_histogram(bins = 100)
Your Turn
# Load Packages 
library(tidyverse)
# Import Data 
penguins < read_csv("penguins.csv")
# Histograms 
# Make a histogram that shows the distribution of the body_mass_g variable.
# YOUR CODE HERE
# Adjust your histogram so it has 50 bins.
# YOUR CODE HERE
Learn More
You can find examples of code to make histograms on the Data to Viz website , the R Graph Gallery website , and in Chapter 6 of the R Graphics Cookbook , and Chapter 7 of the Fundamentals of Data Visualization.
To learn about more statistical transformations, Chapter 9 of R for Data Science has a discussion of them.
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