What we do is we test what works on Wall Street. And sometimes it is earnings momentum, and sometimes it's earnings surprises. Sometimes it's price-to-sales cash flow, and then we put together our stock selection models.

There's 4,000-plus stocks out there, and sometimes it gets a little confusing. And we like them to start with the portfolio grader, but if they'd like to see how I use the system and pick stocks - we offer that as well.

We test everything on a one- and a three-year cycle. And you want to stress-test a model, and the three-year test usually does that because you have a growth and value bias. You have different interest rate environments.

Louis Navellier Quotes