Big data has quickly become the big differentiator in the pursuit of alpha, but one area that is just starting to gain attention is the data "thrown off" by the investment process itself, says Stan Altshuller, chief research officer, Novus. Altshuller and TABB Group partner Alex Tabb talk about innovative uses of big data on the buy side, including how firms are mining the overflow of data from their managers and portfolios to sharpen the investment process and create alpha-generating opportunities.