# Series expansion of a sigmoid

## Main Question or Discussion Point

I am just curious to know if it is possible to derive a series expansion for the following sigmoid equation:

base + max/(1+exp(H-x/rate))

where the coefficients are base, max, H, and rate.

Would appreciate any insight.

## Answers and Replies

Seem like I can infer from the ratio of responses to views that this is not a very feasible concept...? In any case, I would appreciate any type of feedback. I would just like to get an idea of how attainable the derivation is, especially from someone who is knowledgable on applying taylor series expansion to functions.

I am just curious to know if it is possible to derive a series expansion for the following sigmoid equation:

base + max/(1+exp(H-x/rate))

where the coefficients are base, max, H, and rate.

Would appreciate any insight.
What type of series are you interested in? Taylor?
You can use wolframalpha's symbolic calculator: http://www.wolframalpha.com/input/?i=series+b+++m/(1+exp(H-x/r))