Psignifit allows fitting of psychometric functions to datasets while maintaining full control over a large number of parameters. psignifit performs the calculation of confidence intervals as well as goodness-of-fit tests. in addition it offers:

* full bayesian treatment of psychometric functions including bayesian
model selection and goodness of fit assessment
* identification of influential observations and outlier detection
* flexible shape definition of the psychometric function
this package provides the python bindings.