Re: Creating more than two level factor

["Richard M. Heiberger" <rmh@temple.edu>]

> fish <- factor(rep(1:2,3), labels=c("fish","nofish"))
> fish
[1] fish   nofish fish   nofish fish   nofish
> depth <- factor(c(1,1,1,2,2,2), labels=c("Deep","Shallow"))
> depth
[1] Deep    Deep    Deep    Shallow Shallow Shallow
> fish.depth <- interaction(fish, depth)
> fish.depth
[1] fish.Deep      nofish.Deep    fish.Deep      nofish.Shallow fish.Shallow  
[6] nofish.Shallow
>