Yes, the grandparent comment makes a good point. You can have plenty of solid data and still make a losing trade. But, given enough data-informed trades that w

Yes, the grandparent comment makes a good point. You can have plenty of solid data and still make a losing trade. But, given enough data-informed trades that would otherwise be proditable, the law of large numbers suggests that an overall strategy will still be sound. You can afford to have the market be irrational here and there if you really are correctly forecasting earnings in advance most of the time.