SDT Assistant V3.1 — Signal Detection Theory (SDT) Analysis Software

SDT Assistant V3.1 is SDT analysis software for psychophysical and sensory data. SDT Assistant was updated to perform the full range of analyses described in Detection Theory: A User’s Guide (Hautus, Macmillan, & Creelman, 2021).

Download

SDT Assistant is distributed via Zenodo. The download archive includes the SDT Assistant application (Windows) and the user manual (PDF).

Download (Zenodo DOI): https://doi.org/10.5281/zenodo.18665423

Recommended citation: Hautus, M. J. (2025). SDT Assistant (Version 3.1) [Computer software]. https://doi.org/10.5281/zenodo.18665423

Training videos

SDT Assistant: An Introduction

SDT Assistant: A Simple ROC Analysis

Key features

• ROC analysis for rating data: Fit equal-variance and unequal-variance normal models to rating responses from Yes–No, 2AFC, Same–Different, and related designs.
• Binary response analysis: Estimate d′ and calculate exact standard errors for binary data across tasks such as A–Not–A, 2AFC, ABX, and others.
• Data visualisation: Generate plot-ready data for normal densities and receiver operating characteristic (ROC) curves.
• Appendix 5 tables: Extend the tables in Detection Theory: A User’s Guide (Appendix 5) without interpolation.