Average Absolute Deviation?

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Delany MacDonald
Delany MacDonald 2016-3-16
编辑： Image Analyst 2016-3-16
What is the coding in matlab to find the AAD?

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回答（3 个）

John D'Errico
John D'Errico 2016-3-16
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
  1 个评论
Delany MacDonald
Delany MacDonald 2016-3-16
If its standard deviation would it be y= std(x) then absy = abs(y) then meany = mean(absy)?

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Walter Roberson
Walter Roberson 2016-3-16
mean( abs(x - mean(x)) )
Image Analyst
Image Analyst 2016-3-16
编辑：Image Analyst 2016-3-16
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.

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