[R] Installing a new R Package for MacOS

[Leo Wang-Kit Cheung]

Hi,

I am new to using R. I am using the MacOS rm161 version on my
PowerMac G4, and having problem installing a new package msm.
Within R, I typed 

> options(CRAN = "http://cran.stat.ucla.edu/")

Then, I use the following functions, but keep getting errors.

> install.packages("msm") 
Error: couldn't find function "install.packages"

and 

> download.packages("msm")
Error: couldn't find function "download.packages"

Please help. Thanks!

Leo