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2 votes

Count Data Dependent Variable

A number of hours is probably a count, as long as you round to full hours. Once you track minutes, or fractional hours, it's no longer count. That said, my first distributional assumption would not ...
Stephan Kolassa's user avatar
7 votes

SPSS R^2 for Negative Binomial

It is not at all obvious what $R^2$ should mean in this case. Is it the squared Pearson correlation between observed and fitted values, $R^2=\left(\text{corr}\left(y, \hat y\right)\right)^2?$ Is it ...
Dave's user avatar
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5 votes

Running a Negative Binomial Regression with Overdispersion

I am less experienced with NB regression, but can offer my insight if others don't chime in. To your questions: I am testing the number of days people go running in a week (dependent variable) ...
Shawn Hemelstrand's user avatar
1 vote

GLMM with negative binomial- narrowing down variables & choosing a model

Regarding your first question, it looks like the issue is that you have more predictors than observations. When you have a categorical covariate (e.g., Site), each level is treated as a separate ...
Laura Lee's user avatar
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