Ben Goldacre from the UK had a good idea; all studies like that should be put on a registry when the company or whoever starts them, with a date as to when they expect results. Then when they don't come out with results, people can start asking where the study went.
Because sitting on studies that don't get the desired results is a thing, he shows in one of his books how you can do funnel plots of groups of studies to see how studies are missing.
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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