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The whole article smells like bad science. Just looking at the first plot, you can immediately see something is off. LOESS CIs are a bit tricky, but here either the model is completely wrong or the CI calculation is. So the trend is definitely not as significant as they make it out to be. A realistic 95% CI would look like this: https://james-brennan.github.io/img/lowess1_22_1.png


The CI is for the mean, not for the entire data. This is the difference between a confidence and a prediction interval: https://stats.stackexchange.com/questions/225652/prediction-...

I do agree that it's fairly noisy though.




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