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- Welcome to Fundamentals of R
- Update Everything
- Start a New Project
-
Data Wrangling and Analysis
- The Tidyverse
- Pipes
- 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
- Save Plots
- Bring it All Together (Data Visualization)
-
Quarto
- Quarto Overview
- YAML
- Text
- Code Chunks
- Tips for Working with Quarto
- Bring It All Together (Quarto)
-
Wrapping Up
- An Important Workflow Tip
Fundamentals of R
summarize
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This lesson is called summarize, part of the Fundamentals of R course. This lesson is called summarize, part of the Fundamentals of R course.
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Transcript
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Your Turn
Complete the summarize sections of the data-wrangling-and-analysis-exercises.Rmd file.
Learn More
General Data Wrangling and Analysis Resources
Because most material that discusses data wrangling and analysis with the dplyr packges does so in a way that covers all of the verbs discussed in this course, I have chosen not to separate them by lesson. Instead, here are some helpful resources for learning more about all of the tidyverse verbs discussed in this course:
Chapter 5 of R for Data Science
RStudio Cloud primer on working with data
Tidyverse for Beginners by Danielle Navarro
Learning Statistics with R by Danielle Navarro
Introduction to the Tidyverse by Alison Hill
A gRadual intRoduction to data wRangling by Chester Ismay and Ted Laderas
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Elan Sykes
October 2, 2021
I got the count function to count the number of rows as assigned, but wanted to figure out a way to figure out the number of rows without an NA/with an answer for hours of sleep per night. I tried to add an argument "na.rm = TRUE" to the n() function in a few places in the code chunk but it didn't work.
Laura Hickerson
January 18, 2022
Hi David - with the summarize function, it looks like you did not use a select statement afterward, but it still outputs the result. I have to put in a select statement afterwards to get any output for mean_hours_sleep. Any thoughts?
Kim Cataldo
April 4, 2022
After we run the summarize function to create ‘mean_hours_sleep’ is this considered a new variable? Or only if we assign it? If we don’t assign it, do we have to repeat the summarize line of code whenever we want to reference it again, like when we’re using group_by?
nhanes %>% group_by(gender, work) %>% summarize(mean_hours_sleep = mean(sleep_hrs_night, na.rm = TRUE))
Abdikadir Eftin
November 2, 2023
Hi David,
Can I use mean_hrs? then rather "hours" what difference would it make? Why are we spelling out hours rather than leaving it at just hrs?