How do you know if an outlier is the result of a data glitch, or a real data point -- indeed maybe not an outlier. Difficult question to answer, but the chart below shows that in some cases, the outlier is not an error. Source: http://www.businessinsider.com/life-expectancy-vs-healthcare-spending-2014-3 In this example, you could argue that we are not using the right metrics: comparing health ex…
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