[R] Hierarchical Regression

[Ragnar Beer]

Howdy!

I'm a clinical psychologist desperately trying to get rid of SPSS. I 
just discovered R and like it quite a lot. The main reason why we're 
still using SPSS  is the hierarchical regression where you enter 
bundles of variables into a linear model and get an R-sqare increase 
tested with an F-test. I already found add1 and drop1 but would 
rather need addn and dropn. Is there something like that? Or how else 
can I get what I want?

--Ragnar
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