[R] a newbie question about "data"

envisage envisage at gmail.com
Thu Nov 8 04:26:33 CET 2007

hi, I am reading Modern Applied Statistics with S 4th ed。
page4 have these two lines:
> library(MASS)
> data(chem) # needed in R only
 but I find withou the line " data(chem)"
I can still access chem, isn't it?
is it unnecessary or something i missed here?
thanks for the replay in advance.

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