Deviance (statistics)
Measure of goodness of fit for a statistical model / From Wikipedia, the free encyclopedia
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Not to be confused with Deviate (statistics), Deviation (statistics), Discrepancy (statistics), or Divergence (statistics).
In statistics, deviance is a goodness-of-fit statistic for a statistical model; it is often used for statistical hypothesis testing. It is a generalization of the idea of using the sum of squares of residuals (SSR) in ordinary least squares to cases where model-fitting is achieved by maximum likelihood. It plays an important role in exponential dispersion models and generalized linear models.
Deviance can be related to Kullback-Leibler divergence.[1]