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    How to test the variability of count data over time

    I'm wondering how I might best test for over-dispersion of raw count data over time. I have just started a project and am exploring my data, so I do not have a model to test on. I have 4000 independent customers and the frequency of their purchases per day for 44 days. I must determine whether...
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    ANOVA: is this an interaction term?

    I'm doing a research project on red light camera effectiveness. I'm modeling my ANOVA after another study done that is freely available here. I have only one question at the moment. In their ANOVA tables on page 32, is "camera sites after versus other" an interaction term? I'm having some...