consistency in referring to spread functions (#688)
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@ -677,8 +677,8 @@ Just using means, counts, and sum can get you a long way, but R provides many ot
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```
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* Measures of spread: `sd(x)`, `IQR(x)`, `mad(x)`. The root mean squared deviation,
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or standard deviation or sd for short, is the standard measure of spread.
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The interquartile range `IQR()` and median absolute deviation `mad(x)`
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or standard deviation `sd(x)`, is the standard measure of spread.
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The interquartile range `IQR(x)` and median absolute deviation `mad(x)`
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are robust equivalents that may be more useful if you have outliers.
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```{r}
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