Part 2. MM4XL Tools > 1. Strategic Tools > Forecast Manager > 3. Technicalities > Opening the black box of Forecast Manager > Control Charts

Forecast Manager

Control Charts

Index

Formula

Meaning

Cumulative Sum Chart (CuSum)

Source: Lewandowski

Sales Forecast Software with Sales History Data

It shows the cumulative error term within an upper and a lower boundary.

Sales Forecast Software with Sales History Data = standard deviation of residuals

t = corresponding time period.

Special Events Chart

Source: Lewandowski

Sales Forecast Software with Sales History Data

It shows the percentage residual curve between upper and lower limits.

The leading concept behind the chart is that residuals are normally distributed, so error terms lying above the 2 standard deviation limit can be seen as abnormal. The cause of abnormality can be found, for instance, in promotional actions run by our company or a competitor.

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