D Prime Calculator

D Prime Calculator calculator can be used to measure the sensitivity of a participant in a psychophysical task, such as detecting a stimulus in noise.

Input Parameters

Calculation Results

Calculation Formula

D' = Z(Hit Rate) - Z(False Alarm Rate)

Where:
Z(value) = Φ^-1(value) is the inverse of the normal cumulative distribution function.

D Prime Calculator Calculator Usage Guide

Learn how to use the D Prime Calculator calculator and its working principles

How to Use the D Prime Calculator

The D Prime Calculator is used to measure the sensitivity of a participant in a psychophysical task, such as detecting a stimulus in noise. To use the calculator, follow these steps:

  1. Enter the Hit Rate, which is the percentage of correct detections out of all trials where the stimulus was present.
  2. Enter the False Alarm Rate, which is the percentage of incorrect detections out of all trials where the stimulus was absent.
  3. Click the "Calculate" button to compute the D' score.
  4. The D' score is a measure of sensitivity, where higher values indicate better performance.

Understanding the Formula

The D' score is calculated using the formula:

D' = Z(Hit Rate) - Z(False Alarm Rate)

Where Z(value) = Φ^-1(value) is the inverse of the normal cumulative distribution function. This transformation converts the hit and false alarm rates into Z-scores, which can then be subtracted to yield the D' score.