The peak of the (log)-likelihood surface gives you point estimates of parameters. Likelihood theory provides an additional enormously handy (asymptotically correct) Often (e.g. in these examples) we have several parameters here, so the jargon is fancier, but the idea is the same: the Hessian is an...

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    mlecov computes a finite difference approximation to the Hessian of the log-likelihood at the maximum likelihood estimates params, given the observed data, and returns the negative inverse of that Hessian.

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    log-likelihood function, lnLðwjyÞ: This is because the twofunctions,lnLðwjyÞ andLðwjyÞ; aremonotonically related to each other so the same MLE estimate is obtainedbymaximizingeitherone.Assumingthatthe log-likelihood function, lnLðwjyÞ; is differentiable, if w MLE exists, it must satisfy the following partial θˆi = Ni /N. Hessian (matrix of derivatives) of likelihood at θˆ is negative denite (θˆ maximizes likelihood). Back to Naive Bayes. Maximum likelihood estimation. Log-likelihood "factorizes" as. Nijk log θijk =.

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