I think this is my first (or 2nd?) post, but hopefully one of many in this community. I've recently decided to start educating myself on stock markets and have been doing a lot of reading.
I've got a statistical background and was wondering if analysts have found any relationships between different sets of data within the stock market? i.e. if one industry is trending down, another tends to improve....things like that. There's a wealth of data there to do historical analysis, and surely people have run models to try and generate something predictive.
Is this a case of people possibly doing exactly this, and keeping it under wraps for their own benefit? Or does this type of thing happen all the time?
Or is it generally know that this is just a waste of time....you can't use the movement or performance of one or many indicators to accurately predict another.
I don't expect a detailed answer, just hoping to generate some discussion.