Most practitioners, however, define and use the MAPE as the Mean Absolute Deviation divided by Average Sales, which is just a volume weighted MAPE, also referred to as the MAD/Mean ratio.
Most practitioners define and use the MAPE as the Mean Absolute Deviation, also referred to as the MAD/Mean ratio. This was however. This Mean Absolute Deviation was divided by Average Sales. Average Sales is just a volume. This volume is weighted MAPE.