Even indexes like the S&P 500 are nothing but prefiltered lists of stocks. S&P’s criteria include size and industry. Buffet is famous for filtering out stocks by his own criteria, mainly focusing on the balance sheet.
Nothing is certain, but a good filter increases the likelihood of profit, sometimes to a ridiculous degree.
Citation? I've made profit without ever looking at a screening tool or doing technical analysis.
> Nothing is certain, but a good filter increases the likelihood of profit, sometimes to a ridiculous degree.
Citation?
Analysts do tons of technical analysis and fail to beat SPY. Buffet himself even made a Long Bet with someone to this point. I'm surprised you'd use him as an example...
Also, filter != technical analysis. Filters can work on any indicator. I use them on fundamentals, as do Buffet, Munger, Graham, Dodd.