[a,b,thresh50] = FitLogitYN(inputs,nYes,nNo)

Fit a logistic function to YN psychometric data.
Returns logistic parameters and 50% threshold.

The form of the logistic equation is pYes = 1/(1+10^-(a*inputs+b))

The logistic is not a good function to use for serious work,
but you can do a quick and dirty fit analytically and
you can explain it to students more easily than some
other candidate models for psychometric functions.

See also: FitLogistic, FitWeibYN, FitCumNormYN,
InvertLogistic, ComputeLogistic.

2/8/97 dhb Wrote it.

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