I realized that this metric of “balancedness” (need better word) of bikeshare stations can be sliced and diced across a few different dimensions. Here’s the level of balance by station in 2011. At first it appears that many of the most popular stations can be the most off-balance (on net, over the year), but this could be just that there’s more trips at the busier stations – this need further research, and I need a better measurement of balance.
Anyway, how about adding time of day and seasonality to this? Are some stations way off balance in the morning, but it reverses again in the evening? Does a station’s balancedness change over time of year? Anyone want to take a crack at this?