Lecture 3

Lecture handout:

chp3-handout.pdf

Lecture slides (w/ answers):

chp3.pdf

Textbook:

Chapter 3: Probability

R Topics:

• Base R http://github.com/rstudio/cheatsheets/raw/master/base-r.pdf
• lists

?list
typeof(present) # data from hw1

• list indexing: present[1], present[1,2]

• single vs. double angle brackets

• sequential list generation x<-1:10

• length(x)

• names(present)

• attach, detach

present$boys 
boys
attach(present)
girls
search
detach(present)
girls

• reading and writing csv data

write.csv(present, file="present.csv")
present2 <- read.csv(file="present.csv")
?read.csv

• loading and saving rdata: load() and save()