Statistics and Statistical Programming (Winter 2017)/R lecture outline: Week 3

Review of material from class

• loading data:
  • load() versus read.csv()
  • when things don't coopreate...
  • library(foreign)
• defining functions
  • syntax for defining functions: show the my.mean function
  • calling functions (your own or others) with apply(), lapply(), sapply()
• stuff related to distributions
  • rep()
  • seq()
  • sample(); and sampling into data.frames

Online only

• dates with POSIXct(). dates will almost always be given to you as characters, and you need to parse them
• tapply(), and putting things back into data.frames
• merge()