The purpose of using a trend quantity with the mathematical forecast is to use history information to make out a trend to
use.

The trend quantity indicates the difference between average demand in two consecutive forecast periods. It is calculated automatically
using exponential smoothing. The beta factor is used as a smoothing constant for this calculation.

## Before you start

In 'Forecast Method. Open' (FCS300/F), set the parameter Extrapolate with trend to 2 (trend quantity) for the forecast method to use.

## Description

In this example, the Beta factor is set to 0.5.

If the demand for 0211 is 100 and for 0212 is 120, the forecast for 0301 equals 1200/12+((120-100)*0,5) = 110.