How Do You Avoid Overfitting to Market Environments?

When we started computers were something pretty new and using computers and using trends because trends, of course, without computers are much more difficult. But computers have become a disadvantage over the year because we have now so much computer time available in my little phone that is more computer time than in the big computer we had in our office in the early 90s. And if you have no clear idea and you test it anyway, you can do over and over testing instead of having a good idea. It has always been easy to do historical, hypothetical returns, but it has become more easy the last few years. The only thing changed over the last 10 years is that it has now been accepted by regulators to

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