1. A method for determining confidence with respect to confirmation of an individual's identity by threshold score evaluation of parameters, the method comprising; (a) separately sampling a parameter given a plurality of times to provide a template; (b) comparing each sample with the template and a statistical descriptor indicative of a probability range of the difference; and, (c) storing a mean similarity score and the statistical descriptor so that upon presentation of a validation parameter set for validation purposes that validation set is compared to the statistical descriptor and the mean similarity score in order to provide a predictive response relative to the likelihood that the parameter is correctly identified.