Ben,
I tried playing with the "na.action" but that didn't seem to help. I didn't
know of the na.omit function. It made it much easier to get rid of all the
missing values in the file, and now the regression model is running.
I hadn't put interactions in the model yet since it wasn't even running.
Cosday, sinday, and daylength are strongly collinear. The full model with
interactions keeps all three in, plus all interactions between them.
Thanks for your help!
Tim
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