[R] Please help me about the regress models!

[Leon_Long]

I am a bigginer of R language.I need to prepare a PPT which deadline is 15
Nov. 2008.  I want to build a regress model with my own formula. The formula
is y=100/(1+exp(a+b*X)). I have no idea of the R program,please demonstrate
how to do it or give a good sample.
Anyone would help me? Thank you very much!
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