Likelihood is a function of how likely an event is, which is weaker than probability (or odds in favor).
In statistics, a likelihood function is a function of the parameters of a statistical model, defined as follows: the likelihood of a set of parameter values given some observed outcomes is equal to the probability of those observed outcomes given those parameter values. Likelihood functions play a key role in statistical inference, especially methods of estimating a parameter using a statistics (a function of the data).
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