Trading evidence vs experience

I was wondering where I could find actual evidence about trading strategies and claims. I have a background in medicine and where a lot of teachings used to be based on experience of older doctors there's a current trend towards so called evidence based medicine. Assumptions are tested in a scientifically sound manner (usually anyway). I'm sure most people have heard of randomized controlled clinical trials.

Does something similar exist for trading? For example, using breakouts as trading signal. According to some people this is a sound strategy, according to others it isn't due to an excess of false breakouts. My point is most books & commentary about trading is just a big pool of opinions. I can't imagine people have not tried to study these things in a more objective manner. Where do I find (or buy) more objective information?

Many thanks for any insight.

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