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In a likelihood function,we would like to find out the parameter for the observed events.However,

1)how could we know if we don't have the distribution of the events?


2)what if we have 2 possible distribution for that particular events to be observed,how do we deduce for the parameter??

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It doesn't make sense to speak of a likelihood function unless one has at least two possible distributions in mind. Usually one has a parametrized family of distributions and the argument to the likelihood function is the parameter. –  Michael Hardy Feb 16 '12 at 1:59
What if there are 2 possible distribution for that event to be observed? –  Mathematics Feb 16 '12 at 2:09

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