>Psychtoolbox>Psychometric

[uEst,varEst] = FitCumNormYN(inputs,nYes,nNo)

Fits a cumulative normal 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
OUTPUTS:
uEst
varEst

See also: FitWeibTAFC, FitFitWeibYN, FitWeibAlphTAFC, FitLogitYN

9/22/93 jms Created from FitWeibullYN.
2/8/97 dhb Cleaned up and added some comments.
Check that optimization toolbox is present.
10/4/00 dhb Fixed bugs along lines suggested by Keith Schneider.
Case of uInitial = 0 wasn’t handled properly, and
variance search limits were set based on mean.
3/4/05 dhb Conditionals for optimization toolbox version.