Returns a forecast of the value the input will take on at Time + Horizon. Equivalent to the equations:
FORECAST=input*(1+TRD*horizon)
TRD = ZIDZ(input-AV,average time*AV)
AV=INTEG((input-AV)/average time,ininput)
The FORECAST function provides a very simple trend extrapolation forecast of the future value of a variable based on its past behavior. Like any trend extrapolator it performs very badly at turnarounds.
Units: FORECAST(units,time,time) --> units
The input units match the output units. Units for the average time and the horizon must match those of TIME STEP.
Example
R = 10 + RAMP(1,10,60)
RD = DELAY FIXED(R,10,R)
FR = FORECAST(RD,5,10)
Sample model: FORECAST.mdl in FunctionExamples
