Bootstrap estimates of the statistical accuracy of thresholds obtained from psychometric functions.
Estimates of the accuracy of a threshold obtained from a psychometric function are often based on asymptotic theory. When the number of trails is small, however, these estimates may be untrustworthy. A computer program is described that uses a move reliable bootstrap approach to obtaining estimates of the standard deviation and confidence limits of a threshold and of the slope and spread of the psychometric function for any criterion level of performance.
Foster
D H
DH
Department of Vision Sciences, Aston University, Birmingham B4 7ET, UK. d.h.foster@aston.ac.uk
Bischof
W F
WF
D003627:Data Interpretation, Statistical; D011594:Psychometrics / Q000706:statistics & numerical data*; D018709:Statistics, Nonparametric