[a,b] = FitLogistic(x,y)

Fit a logistic function to the data pairs x,y.

The form of the logistic equation is y = 1/(1+10^-(ax+b)).
The method used here is to regres on transformed coordinates.
One could use search to do a maximum likelihood function for
psychometric data, but if you are going to do that, you
should probably fit a cumulative normal or Weibull function.

See also: ComputeLogistic, InvertLogistic, FitLogitYN, FitWeibTAFC,
FitWeibYN, FitAlphaWeibTAFC.

2/15/95 dhb Wrote it.

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