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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
) )
``` ```
* 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. or standard deviation or sd for short, is the standard measure of spread.
The interquartile range `IQR()` and median absolute deviation `mad(x)` The interquartile range `IQR()` and median absolute deviation `mad(x)`
are robust equivalents that may be more useful if you have outliers. are robust equivalents that may be more useful if you have outliers.