Statistics and Statistical Programming (Winter 2017)/R lecture outline: Week 3
From CommunityData
Review of material from class[edit]
- 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[edit]
- 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()