Signal Detection Theory (SDT) Assistant - Signal Detection Theory Analysis Software
SDT Assistant V3.1 is signal detection theory (SDT) analysis software for psychophysical and sensory data. Following the third edition of Detection Theory: A User’s Guide (Hautus, Macmillan, & Creelman, 2021), SDT Assistant has been expanded to support the analyses described in that edition. The software supports receiver operating characteristic (ROC) curve fitting for rating data from Yes–No (A–Not A), 2AFC (two-alternative forced choice), 2AFCR (2AFC with reminder), Same–Different, and Yes–No with reminder tasks. It also includes a curve generator, binary-response d′ calculators, preference-model analyses, and calculators for tables reported in the book.
In V3.1, EV (equal-variance) Yes–No and EV 2AFC models additionally report a second asymptotic variance–covariance matrix for the reparameterization that expresses response bias using the decision criterion c (not yet implemented for other models). This release is the first Windows 64-bit (Win64) version.
Reference
Hautus, M. J., Macmillan, N. A., & Creelman, C. D. (2021). Detection theory: A user’s guide (3rd ed.). Routledge. https://doi.org/10.4324/9781003203636
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SDT Assistant Manual - V. 3.1 - 2025.pdf Size : 343.947 Kb Type : pdf |
Key Features of SDT Assistant V3.1
- ROC Analysis for Rating Data: Fit equal-variance and unequal-variance normal models to rating responses from Yes-No, 2AFC, Same-Different and more experimental designs.
- Binary Response Analysis: Estimate d′ and calculate exact standard errors for binary data across numerous tasks like A-Not-A, 2AFC, ABX, and others.
- Data Visualization: Generate plot-ready data for normal densities and ROC curves to visualise in graphing software.
- Appendix 5 Tables: Extend the tables from Detection Theory: A User's Guide, Appendix 5, without interpolation.
Free to use and packed with cutting-edge SDT analysis capabilities, SDT Assistant V3.0 is a must-have tool for researchers, students and professionals working with psychophysics and sensory evaluation data.
Download the latest version now and explore the detailed manual for examples and guidance. Spread the word about SDT Assistant to your colleagues and institutional libraries - a wide adoption will help disseminate signal detection theory methods broadly.