Added some regression lectures
Add ggplot2 lectures
pca lecture
Middle initial
Change author
More of Jeff's transcripts for EDA
Change author
Don't download data if it already exists
Skip stuff on graphics devices; covered in separate lecture
Images for expository graphs lecture
Promotion
Add reminder
Don't load data unless you have to
Change author; don't download data
Copy more images for exploratory plots
Clean up code a little
Merge two exploratory graphs lectures into one lecture
Rename old exploratory graphs lectures
Worked a lot on the intro regression lectures
Worked on lecture 01