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WorksheetFunction.Forecast Method (Excel)

Calculates, or predicts, a future value by using existing values. The predicted value is a y-value for a given x-value. The known values are existing x-values and y-values, and the new value is predicted by using linear regression. You can use this function to predict future sales, inventory requirements, or consumer trends.

expression .Forecast(Arg1, Arg2, Arg3)

expression A variable that represents a WorksheetFunction object.

Parameters

Name

Required/Optional

Data Type

Description

Arg1

Required

Double

X - the data point for which you want to predict a value.

Arg2

Required

Variant

Known_y's - the dependent array or range of data.

Arg3

Required

Variant

Known_x's - the independent array or range of data.

Return Value

Double

  • If x is nonnumeric, FORECAST returns the #VALUE! error value.

  • If known_y's and known_x's are empty or contain a different number of data points, FORECAST returns the #N/A error value.

  • If the variance of known_x's equals zero, then FORECAST returns the #DIV/0! error value.

  • The equation for FORECAST is a+bx, where: Ff837399.awfintc1_ZA06051174(en-us,office.14).gifand: Ff837399.awfintc2_ZA06051175(en-us,office.14).gifand where x and y are the sample means AVERAGE(known_x's) and AVERAGE(known y's).

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