The question is whether investors frightened away today will be regretful tomorrow. If only I'd bought ABC or XYZ in 2001 when the price plummeted . . . I can't tell you what ABC and XYZ are. If only I could. So if you're still comfortable selecting your own stocks, have the money for it and are prepared for the possibility that they could go lower still, it makes sense now at least to do a little window-shopping.
Stock screens are filter-equipped databases of publicly traded companies.
They are among the tools once only available to professionals that are now available to everyone, thanks to Internet technology. Or you might want to narrow it to certain types of companies with high dividend yields. Or you might want to use screens tailored to reflect proprietary methods of identifying decent low-priced stocks or screens attempting to replicate the minds of famous investors, notably Warren Buffett. Personally, I screen regularly for potential values on a number of sites. But I don't take them too seriously.