How One 19-Year-Old Illinois Man Is Distorting National Polling Averages

It seems that the current US election has created a new type of data geek, and apparently there are enough of us to get a post on polling methodology shared 40,000 times. The headline of this article is not hyperbole: there is literally a single individual who, because of the idiosyncratic grouping and weighting process of one particular poll, is shifting the results by an entire percentage point all by himself. This story is interesting in and of itself, but begs the larger question: what unintentional, quirky biases exist in our analyses and how can we ferret them out?


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