Working Day Error New Year's Eve

Low-rank approximations represent a type of "averaged" behavior. Real traffic, minute-by-minute, differs from this averaged behavior. The above left image is typical workday error from the low-rank approximation is left. Links in green are moderate relative errors while links in red are large relative errors. The above right image is relative error on New Year's Eve (2011). There is a noticeable cluster of large errors near Central Park. Work by Xinyu Liu.