It can be tempting to try to time the market, and get out before the crashes and recessions, but there's a mountain of research that suggests it's much better for investors to fight that urge and stay invested.In this clip from Industry Focus: Tech, Motley Fool analysts Dylan Lewis and David Kretzmann go over some of that research and explain why it's so important to stay invested for years at a time, and not try to miss bad days or months.