One important factor affecting the water quality is the area's temperature and rainfall, and Hunt's model is set up for the mid-Atlantic region of the United States.

VOA: standard.2010.08.04

Their three-factor model is one of the most popular among researchers, though many now include momentum as a fourth factor.

WSJ: Supercharging Your Investment Portfolio

The "capital asset pricing model" identified one factor, beta, or a stock's volatility relative to the index, as pivotal to the stock's returns.

WSJ: Supercharging Your Investment Portfolio

Chief Marketing and Strategy Officers from every industry must accept one critical success factor: create a Hispanic business model if you want to fully capture long term success with the Hispanic consumer.

FORBES: Capturing the Hispanic Market Will Require More Than A Total Market Strategy