| aic | Calculates the AICs | 
| avbootstrap | Creates bootstrap samples | 
| cum_normal_fun | Cumulative normal function | 
| deviance | Calculates the deviances | 
| devianceboot | Calculates the bootsrap deviances | 
| get_functions | Predefined functions | 
| inv_cum_normal_fun | Inverse cumulative normal function | 
| inv_logistic_fun | Inverse logistic function | 
| inv_weibull_fun | Inverse Weibull function | 
| logistic_fun | Logistic function | 
| logliks | Calculates the loglikelihoods 'logliks' calculates the loglikelihoods. | 
| logliksboot | Calculates the bootstrap loglikelihoods | 
| logliksbootsaturated | Calculates the bootstrap loglikelihoods for the saturated model | 
| loglikssaturated | Calculates the loglikelihoods of the saturated model | 
| parbootstrap | Creates bootstrap samples of the parameters | 
| plotcurves | Plot the curves | 
| plotcurves_ | Plot the curves | 
| plotpar | Plot the values of the parameters | 
| plotpar_ | Plot the values of the parameters | 
| plotthresholds | Plot the thresholds | 
| plotthresholds_ | Plot the thresholds | 
| qpdat | Data set for demonstration | 
| quickpsy | Fits psychometric functions | 
| quickpsy_ | Fits psychometric functions | 
| quickreadfiles | Reads several files | 
| sse | Sum of squared errors of prediction | 
| summary.quickpsy | Plot the parameters and its confidence intervals 'summary' Plot the parameters and its confidence intervals | 
| weibull_fun | Weibull function | 
| ypred | Predicted probabilities |