1. A system for providing hiring recommendations of agents within a call center, comprising: a voice sample from a candidate agent; an analysis module to analyze the voice sample by comparing the voice sample with at least one voice model associated with voice characteristics for two or more populations of a trait; an identification module to identify one of the populations to which the candidate agent belongs for that trait; a scoring module to assign a score to the candidate agent based on the identified population for the trait; and a recommendation module to provide a recommendation for hire for the candidate agent based on the assigned score.