Q. 18-9PE

Expert-verified
Found in: Page 485

### Operations And Supply Chain Management

Book edition 14th
Author(s) F. Robert Jacobs
Pages 800 pages
ISBN 9780078024023

# Your forecast is, on average, incorrect by about 10 percent. The average demand is 130 units. What is the MAD?

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## Definition of Mean Absolute Deviation (MAD)

The mean absolute deviation (MAD) is an average error within the forecasts, using absolute values. It's valuable because MAD, just like the variance, measures the dispersion of some observed value from some expected value. MAD is computed using the differences between the actual demand and the forecast demand without relation to signing. It equals the sum of the absolute deviations divided by the number of data points.

## Explanation

(Mean Absolute Percent Error).

Mean = 130 units

(10% x 130 = 13 erroneous value)

At = 143 or 117, the absolute value

(143-130 = 13 or;

117-130 = -13)

Mean Absolute Deviation (MAD) is 13