Since you have made it this far, you should have a basic understanding of how Bayesian inference works. I will, however, continue to focus on the more general concept of conditional probability and the availability of various techniques, including but not restricted to the Bayes theorem, that you might use to compute a conditional probability value.
One way to compute a conditional probability is by enumeration and you have explored the idea that databases might be good tools to use to compute conditional probabilties in this way. Indeed, these conditional probability computations often form the primitives used in many data-mining applications. I'll present other opportunties to explore the role of databases in computing conditional probabilites in the upcoming articles on Web survey analysis.
Bayes theorem is another method you can use to compute a conditional probability. In this article, I demonstrated what a prior, likelihood, and posterior distribution are; how to estimate the prior and likelihood distributions from raw data; and how you can use PHP to compute the full posterior distribution. To become more skillful in the art of Bayesian inference requires that you become thoroughly familiar with these three concepts.
You've only scratched the surface of Bayes inference. Hopefully this article has provided you a good foundation for exploring more advanced topics in Bayesian inference, such as Bayes classifiers, Bayes learning algorithms, and Bayes networks.
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