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I wonder what are the recommended eval_metrics for count:poisson as objective in xgboost in R?

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This is from XGBOOST documents: “poisson-nloglik”: negative log-likelihood for Poisson regression.

You might want to go and read more about poisson n loglikelihood.

Here is a link for you to get started: https://onlinecourses.science.psu.edu/stat504/node/31

Hope this can be helpful

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