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Why are we on the to invest or not to invest topic??

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Nobody is on that topic. The question was whether it makes sense to do inferential statistics with poor quality data. I argue, "no, it is statistical malpractice to do so." Despite some posters' claims to the contrary, this has zero bearing on the question of "to invest or not to invest". Instead, the topic was how much credence we should put in a garbage-in-garbage-out analysis.