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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