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Discriminant Power for a Test (Test Effectiveness Statistic)

Purpose:

To determine how well a test performs in separating between affected and unaffected persons.

Specialty:

General content (available to all)

Objective:

other testing

ICD-10:

Description:

The discriminant power for a test, also termed the test effectiveness, is a measure of how well a test distinguishes between affected and unaffected persons. It is the log of the positive likelihood ratio plus the log of the negative likelihood ratio, scaled by the standard deviation of the logistic normal distribution curve (square root of 3 divided by π). Test effectiveness is interpreted as the standardized distance between the means for both populations.

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