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added root to msd (#650)

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Edwin Thoen 2018-06-20 11:07:52 +02:00 committed by Hadley Wickham
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transform.Rmd
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@ -676,7 +676,7 @@ Just using means, counts, and sum can get you a long way, but R provides many ot
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* Measures of spread: `sd(x)`, `IQR(x)`, `mad(x)`. The mean squared deviation,
* Measures of spread: `sd(x)`, `IQR(x)`, `mad(x)`. The root mean squared deviation,
or standard deviation or sd for short, is the standard measure of spread.
The interquartile range `IQR()` and median absolute deviation `mad(x)`
are robust equivalents that may be more useful if you have outliers.