Interactive Principal Component Analysis in R
Written by Matt Dancho on December 15, 2020
This article is part of a R-Tips Weekly, a weekly video tutorial that shows you step-by-step how to do common R coding tasks.
Identify Clusters in your Data:
We’ll make an Interactive PCA visualization to investigate clusters and learn why observations are similar to each other. Here are the links to get set up. 👇
PCA is all about data wrangling
PCA is a great tool for mining your data for clusters. But, most beginners get a few things wrong:
- PCA only works with numeric data
- Categorical data must be encoded as numeric data (e.g. one-hot)
- Numeric data must be scaled (otherwise your PCA will be misleading)
Data Wrangling is SUPER Critical
We need to use
dplyr to encode categorical features as numeric.
PCA will not work with Categorical Data
(You'll get a nice error message)
PCA likes data in this format 😊
What can we do with PCA + ggplot2? Let’s visualize clusters in our data!
First, fit a PCA using
autoplot() from the
Then visualize. As an added bonus, we can make it interactive with
That's some XMAS magic. Santa approves. 👇
But if you really want to improve your productivity…
Here’s how to master R programming and become powered by R. 👇
What happens after you learn R for Business.
Your Job Performance Review after you’ve launched your first Shiny App. 👇
This is career acceleration.
SETUP R-TIPS WEEKLY PROJECT
Sign Up to Get the R-Tips Weekly (You’ll get email notifications of NEW R-Tips as they are released): https://mailchi.mp/business-science/r-tips-newsletter
Set Up the GitHub Repo: https://github.com/business-science/free_r_tips
Check out the setup video (https://youtu.be/F7aYV0RPyD0). Or, Hit Pull in the Git Menu to get the R-Tips Code
Once you take these actions, you’ll be set up to receive R-Tips with Code every week. =)
👇 Top R-Tips Tutorials you might like: