That solution is a process called ‘systematic review’. Instead of just mooching around online and picking out your favourite papers to back up your prejudices and help you sell a product, in a systematic review you have an explicit search strategy for seeking out data (openly described in your paper, even including the search terms you used on databases of research papers), you tabulate the characteristics of each study you find, you measure—ideally blind to the results—the methodological quality of each one (to see how much of a ‘fair test’ it is), you compare alternatives, and then finally
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