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Looking for a nonlinear equation with the following property

  1. Sep 10, 2009 #1

    I am looking for a nonlinear equation capable of approximating a sigmoid curve that can be multiplied by another equation of the same type with different parameters and this product can be made linear in the parameters. I am an ecologist, so I hope I am using the right terms. I originally tried this with the logistic equation.

    1/(1*e^(-a)) * 1/(1*e^(-b))

    after applying the logit link to this you end up with

    ln (e^a + e^b + e^(a+b))

    which won't work for my purposes. I need to end up with a linear function of a and b. Any ideas on equations to try out?

  2. jcsd
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