From lsr v0.5
0th

Percentile

##### Mean (average) absolute deviation from the mean

Calculates the mean absolute deviation from the sample mean.

##### Usage
aad(x, na.rm = FALSE)
##### Arguments
x
A vector containing the observations.
na.rm
A logical value indicating whether or not missing values should be removed. Defaults to FALSE
##### Details

The aad function calculates the average (i.e. mean) absolute deviation from the mean value of x, removing NA values if requested by the user. It exists primarily to simplify the discussion of descriptive statistics during an introductory stats class.

Numeric.

##### Warning

This package is under development, and has been released only due to teaching constraints. Until this notice disappears from the help files, you should assume that everything in the package is subject to change. Backwards compatibility is NOT guaranteed. Functions may be deleted in future versions and new syntax may be inconsistent with earlier versions. For the moment at least, this package should be treated with extreme caution.

mad
library(lsr) # basic usage X <- c(1, 3, 6) # data aad(X) # returns a value of 2 # removing missing data X <- c(1, 3, NA, 6) # data aad(X) # returns NA aad(X, na.rm = TRUE) # returns 2