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by viennacoder
4682 days ago
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I am afraid that the assumptions made in the article (regarding the distribution) are invalid. One very long (say 2 days) visit will skew the average. And you can't infer the standard deviation from the average. For an easy alternative, you could calculate the median time on site ex ante -- let's say it's 1 minute. Then for your ab test, see what percent leave within the first minute. Use that percent and determine if difference is statistically significant. |
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