aad: Mean (average) absolute deviation from the mean
In lsr: Companion to "Learning Statistics with R"

Description Usage Arguments Details Value Examples

Calculates the mean absolute deviation from the sample mean

1	aad(x, na.rm = FALSE)

`x`	A vector containing the observations.
`na.rm`	A logical value indicating whether or not missing values should be removed. Defaults to `FALSE`

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

# basic usage
X <- c(1, 3, 6)  # data
aad(X)           # returns a value of 1.777

# removing missing data
X <- c(1, 3, NA, 6)   # data
aad(X)                # returns NA
aad(X, na.rm = TRUE)  # returns 1.777