[loeg]

I suspect the model comes from overfitting the training data, that is, you would not see expect to see 15-20% outperformance from the same group of analysts next year. Or BigBankCo would immediately hire them to invest their cash.

There are a number of other flaws that require time traveling to make this scheme work, and if you have a time traveling machine, beating the stock market is even easier than this.