Michael has written, and made available for free use, an SDT Assistant program.SDT Assistant is software that undertakes analyses based on Signal Detection Theory (SDT). Currently the software is capable of fitting Receiver Operating Characteristic (ROC) curves based on several different models for a number of psychophysical tasks (or sensory evaluation difference tests) that use the rating response format. The fits are based on maximum likelihood estimation.
Optimal Thresholds and Indifference Curves – by John Irwin
This Excel spreadsheet computes a diagnostic test’s optimal threshold and its corresponding indifference curve. It displays these results together with the test’s ROC curve.