AVERAGE DEVIATION function
Average deviation function.
AVEDEV(range) calculates the average of the absolute difference of all values in range with their arithmetic mean.
It is calculated as follows:
The argument range can be a list of numbers, cell addresses, cell ranges (such as A1:A10).
Range can also be a matrix. In that case the function returns a matrix with one row and the same number of columns, with each element the AVEDEV of the corresponding column. If range is a row matrix, it is converted to a column matrix first.