[R] aggregate example : where is the state.region variable?

John Kane jrkrideau at yahoo.ca
Mon Aug 21 20:00:21 CEST 2006

I was looking ?aggregate and ran the first example

 aggregate(state.x77, list(Region = state.region),

The variables in state.x77 appear to be :
> state.x77
Population Income Illiteracy Life Exp Murder HS Grad
Frost   Area

Where is the "state.region" variable coming from?

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