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Well-known shortcomings, advantages and computational challenges in Bayesian modelling: a few case stories

Well-known shortcomings, advantages and computational challenges in Bayesian modelling: a few case stories

This video was recorded at Bayesian Research Kitchen Workshop (BARK), Grasmere 2008. Bayesian inference can be used to judge the data fit quantitatively through the marginal likelihood. In many practical cases only one model is considered and parameter averaging is simply used to avoid overfitting. I show such an example for a large data set of genomic sequence tags where we want to predict how many new unique tags we will find if we perform new sequencing. The two parameter Yor-Pitman process is used and the results illustrate a few well-known facts: parameter averaging can be crucial and large data sets will expose the inadequacy of the model as seen by unrealistically narrow error-bars on (cross-validated) predictions. This indicates that we should come up with better models and being... Show More

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