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Hello! I'm pplaying with different machine learning algorithms and stock data but I'm a bit confused. Can anyone tell me what is the target algorithm accuracy when it comes to predicting next movements (up/down) upon which one can build a strategy? Should it be 51% or 60, maybe sth different...

Thank you for your explanation. When I don't understand, I ask. When I ask, the question may be poorly formulated as well. But that's the way I learn and your answer helped me get some intuition, that will lead to more accurate questions in future.

Hello! The question is purely theorethical. Let's say that I have developed an algorithm that is predicting whether the market will close lower or higher. If my algo is 80% wrong, is it a way to just trade against its predictions? Or its very rare and the most of the time the algos are very...