Conduct Web experiments using PHP, Part 2

By Paul Meagher
2005-03-18

Eliciting your prior distribution

As a Bayesian sympathizer, I also recommend pre-experimental graphing and data simulation to effectively elicit your subjective prior distribution for the lambda lambda parameters. You can use your prior distribution for the lambda parameters to derive the expected counts to use in the chi-square model-fitting procedure. I will examine this possibility in more depth after I discuss the chi-square formula and the concept of an expected count.

Tutorial Pages:
» Categorical data analysis
» 2x2 contingency tables
» Sampling model
» Discrete probability distributions
» Binomial sampling model
» Poisson sampling model
» Envisioning your results
» Eliciting your prior distribution
» Model fitting with chi-square
» Null effects model
» Independence model
» Prior model
» DOE explorer
» Explorer output
» Conclusions
» Resources

First published by IBM developerWorks

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