Hi list members.
Apologies if this is not too specifically R related, but I am looking fit a model to some simulated data. X is distance to sample point, y is binary outcome (present/absent). I was hoping someone can suggest a (presumably) non linear function that might meet the following criteria

A.   0 < y < 1 (actual responses are binary)
B.   xmax = $B!g(B
C.   xmin < 0
D.   Where x = 0 then y > 0
E.   Where x = $B!g(B then y = 1
F.   As x approaches $B!g(B from xmin, the function$B!G(Bs slope declines monotonically toward 0.

Thanks in advance for any suggestions

Dr Terry Beutel
Agri-Science Queensland





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