ワイブル関数から閾値を求める関数

>>help Psychtoolbox
↓
Psychometric - Psychometric function fitting.
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FitWeibAlphTAFC - Fit Weibull with beta fixed, for TAFC (uses optimization toolbox).
FitWeibTAFC - Fit Weibull for TAFC experiments (uses optimization toolbox).
FitWeibYN - Fit Weibull for YN experiments (uses optimization toolbox).

FitWeibYN　解説

[alpha,beta,thresh50]=FitWeibYN(inputs,nYes,nNo,[alpha0],[beta0],[numFunCalls])

Fits a Weibull function to the passed yes-no data.

Requires the optimization toolbox.

INPUTS:
inputs Input levels
nYes Number of yes responses at
the corresponding input level
nNo Number of no responses at
the corresponding input level
alpha0 Initial guess for alpha (optional)
beta0 Initial guess for beta (optional)
OUTPUTS:
alpha
beta
thresh50 50% threshold

See also: FitWeibTAFC, FitFitWeibAlphTAFC, FitCumNormYN, FitLogitYN