[R] ozone data

[Julius Tesoro]

Hi just a quick inquiry

Sorry if this is too trivial but I am just a beginner in R.

I am looking at the plyr package and I am intrigued at how data(i.e. ozone, baseball) is loaded without having to type data(ozone). Are they automatically loaded when i call library(plyr)? I want to do the same thing when I make my package. How does one accomplish this?

Also, are there any beginner guides on how to make a package?

Thank you all..

Cheers,

Julius TEsoro