I discovered a bug in my code for cleaning the ride data and weather data: I did not include the timezone in the information. Thus, I realized all my weather and traffic indicators were totally wrong. I fixed that, and there seems to be more of an effect of traffic in the non-multilevel regression.
However, I am thinking it might be useful to have a slightly more involved model for traffic. Right now I am just treating traffic by having a binary "Rush Hour" indicator, based more on hearsay. But I think I would like to also explore a model where I just use time of day. It might be useful to have a periodic function used in the regression for time of day. Thoughts?
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