Statistics and Statistical Programming (Winter 2017)/R lecture outline: Week 2

material not covered last week we'll want to cover this time:


 * adding comments: lines that start with # (or anything after a #)
 * more advanced variables types:
 * factors: for categorical data
 * make with factor("mako", "mika", "mako")
 * you can create factors from characters with as.factor
 * also think about: dates with POSIXct, ordered — really just a type of factor for ordinal data