I've found on wikipedia for Logistic function (http://en.wikipedia.org/wiki/Logistic_function) they have the formula for a Logistic curve:
$P(t) = 1 / (1 + e^{-t})$
and they have a diagram of the curve. What is the formula for the cumulative distribution function? I think the cdf curve would look like the logistic curve, but rise faster, but I don't know.
thanks