Screen-Based Investing.
Many quantitative analysts use "screens" to select their investments, meaning that they use a number of quantitative criteria and examine only the companies that meet these criteria. As the use of computers has become widespread, this approach has increased in popularity because it is easy to do. Screens can look at any number of factors about a company's business or its stock over many time periods.
While some investors use screens to generate ideas and then apply fundamental analysis to assess those specific ideas, others view screens as "mechanical models" and buy and sell purely based on what comes up on the screen. These investors claim that using the screen removes emotions from the investing process. (Those who do not use screens would counter that using a screen mechanically also removes most of the intelligence from the process.) One of the proponents of using screens as a starting point is Eric Ryback, and one of the most famous advocates of screens as a mechanical system is James O'Shaughnessy.
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