Hi list members

Sending this again as symbols in the previous version did not translate.

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 = infinity
C.   xmin <= 0
D.   Where x = 0 then y >= 0
E.   Where x equals Infinity then y equals 1
F.   As x approaches Infinity from xmin, the slope of the function declines monotonically toward 0.

Thanks in advance for any suggestions

Dr Terry Beutel
Agri-Science Queensland





********************************DISCLAIMER**************...{{dropped:15}}

