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From: Maxime on 29 Sep 2009 15:10
Hello,

I am currently conducting an experiment in which I am trying to find the threshold of my participants. I present sounds at different entensities in order to built a psychometric curve modelled by the followind equation: ('.25*(1+erf((x-u)/(s*sqrt(2))))+.5').

I need to find the inflexion point of the resulting besfit and to find the slope of the curve at this point. I also need to find the minima of the curve.

Thank you for your help
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