1. A method for individual risk factor identification, comprising: identifying common risk factors for one or more risk targets from population data; stratifying individuals into clusters based upon the common risk factors; and determining, using a processor, a discriminability of each of the common risk factors for a target cluster using individual data of the target cluster to provide re-ranked common risk factors as individual risk factors for the target cluster, such that the discriminability is a measure of how a risk factor discriminates its cluster from other clusters.