[R] writing my own logistic regression function

[mael]

Hi,

I have problems writing a script for a logistic model. My data looks
something like this:

PI	A	N1	N2	N3
0	9	0	1	0	
1	4	1	0	1
0	8	0	0	0
1	6	0	1	0

And so on…

The model I want to fit looks like this: 

PI=exp^f(sw)/1+exp^f(sw) 
where
 f(sw)=c+(a1*N1/A^z)+(a2*N2/A^z)+(a3*N3/A^z)

So I want to estimate c,a1,a2,a3 and z…
Is there someone who can help me on this problem, because I don’t even know
how to start.

Best,
Anna


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