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Instructional Software for
Statistics & Experimental Psychology

RippleSoft Software

Plotting Signal Detection Theory Results

Signal Detection Theory: Plot Tool

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Ploting Isosensitivity and Isobias Functions in the Unit Square

Example 1

The blue line is the isosensitivity (aka "ROC") for judgments which yield a sensitivity (d') value of 0.78.

The orange line is the isobias function showing the correct detection and false alarm tradeoffs that produce an response bias of approximately 1 (actually 1.1).

Isosensitivity, Isobias and a datum plotted in the Unit Square

Example 2

The same isobias and isosensitivity functions are plotted with the an additional datum.

The color and thickness of the plotted lines can be changed as can the color and icon of the data point.

© 2005 by Burrton Woodruff. All Rights Reserved. Modified Thu, Dec 20, 2007s