We discuss when and why custom multi-factor risk models are warranted and give source code for computing some risk … factors. Pension/mutual funds do not require customization but standardization. However, using standardized risk models in … quant trading with much shorter holding horizons is suboptimal: (1) longer horizon risk factors (value, growth, etc …

traders face this sort of joint inference problem, the risk of selecting the wrong features can spill over and distort how … even if traders themselves are fully rational. Moreover, I show how modeling feature-selection risk leads to additional … predictions that are outside the scope of noise-trader risk. For instance, to discover pricing errors as quickly as possible, a …