Likelihood Ratio Test:
The likelihood ratio test is aimed at testing a simple null hypothesis against a simple alternative hypothesis. (See Hypothesis for an explanation of "simple hypothesis").
The likelihood ratio test is based on the likelihood ratio r as the test statistic:
where X is the observed data (sample), P(X | H) is the conditional probability of X provided the hypothesis H is true, H0 is the null hypothesis, H1 is the alternative hypothesis. See also Likelihood function.
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