[R] Logistic Regression on a Windows Machine

[Carrie Beam]

Hello everybody,

I am hoping you can help me.  I just downloaded and installed the 
"precompiled binary distribution" of R to my Windows machine (running 
Windows Millennium).  (I did not download or install anything else - no 
packages).

I need to run a logistic regression and understand the function I need is 
polr() or maybe SSlogis().

However, when I try to invoke either function, I get
    Error: couldn't find function "polr"
    Error: couldn't find function "SSlogis"

I have done some snooping on the website and think I may need the MASS 
package for polr() and the NLS package for SSlogis().

My questions:
1.  Are these indeed the functions I need to run a logistic regression?
2.  If so, are the packages with them available for a Windows machine?

Thanks a million in advance -- you all are the greatest
-- Carrie
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