The sensitivity index or d' (pronounced 'dee-prime') is a statistic used in signal detection theory. A statistic (singular) is the result of applying a statistical algorithm to a set of data. ... Signal detection theory, or SDT, is a means to quantify the ability to discern between signal and noise. ...
d' measures the separation between the means of the signal and noise distributions in units of the standard deviation of the noise distribution. An estimate of d' can be found from measurements of the hit rate and false-alarm rate.
A higher d' indicates that the signal can be more readily detected.
In signal detection theory, a receiver operating characteristic (ROC), also receiver operating curve, is a graphical plot of the sensitivity vs. ... In descriptive statistics, summary statistics are used to summarize a set of observations, in order to communicate as much as possible as simply as possible. ...
Reference
Elementary Signal Detection Theory by Thomas D. Wickens (Ch.2, p.20).
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