# problem-2.22

problem-2.22 The function mad() returns the median deviation from the median. It is a measure of variation similar to the mean-squared distance from the mean (basically the variance) but more robust. For the long-tailed exec.pay data set we see that the standard deviation is very skewed by the outliers:

    > attach(exec.pay)
    > mad(exec.pay)
    [1] 20.76
    > IQR(exec.pay)
    [1] 27.5
    > sd(exec.pay)                  # skewed
    [1] 207.0