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Joinpoint: Frequently Asked Questions

Zeros in the Dependent Variable

How does the Joinpoint software deal with zeros in the dependent variable?

It depends on which Model Type and Heteroscedastic Errors Option are selected:

• If one of the Poisson models are selected, 0.5 is added to each of the counts.
• If the linear model option is selected, then the data is analyzed normally.
• If the log-linear model option is selected, then the by-group with a zero is dropped from the analysis.

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