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Is it possible to implement the psychometric function instead of the logistic, Weibull, etc?

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Is it possible to implement the psychometric function instead of the logistic, Weibull, etc?

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If you want to add a new psychometric function shape to the psignifit engine, it needs to be written in C and added to Psychometric.c before the engine (mex-file) is compiled. The function should follow the conventions laid down in the other functions from that file: if you look at, for example, JLogistic, you’ll note that the function can operate in several different modes and has to be able to return derivatives, inverses and slopes, among other information.

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