Average Absolute Deviation?

What is the coding in matlab to find the AAD?

Answer 1

[John D'Errico]

1. Compute the deviation. (You have not said what the deviation is from, so I cannot answer that.)

2. Compute the absolute value of the deviations. abs will suffice.

help abs

3. Use mean to compute the average.

help mean

[Delany MacDonald]

If its standard deviation would it be y= std(x) then absy = abs(y) then meany = mean(absy)?

Answer 2

[Walter Roberson]

mean( abs(x - mean(x)) )

Answer 3

[Image Analyst]

We usually find the median absolute deviation is a better measure https://en.wikipedia.org/wiki/Median_absolute_deviation because the measure itself is less affected by outliers.

On a global basis you can do

mad = median(abs(array(:) - median(array(:))))

We often use it to find outliers in the data.