WorksheetFunction.Forecast_Linear 方法 (Excel)WorksheetFunction.Forecast_Linear method (Excel)

根据已有的数值计算或预测未来值。Calculates, or predicts, a future value by using existing values. 此预测值为基于给定的 x 值推导出的 y 值。The predicted value is a y-value for a given x-value. 已知的数值为已有的 x 值和 y 值,再利用线性回归对新值进行预测。The known values are existing x-values and y-values, and the new value is predicted by using linear regression. 可以使用该函数来预测未来销售、库存需求或消费趋势等。You can use this function to predict future sales, inventory requirements, or consumer trends.

语法Syntax

表达式Forecast_Linear(Arg1Arg2Arg3)expression.Forecast_Linear (Arg1, Arg2, Arg3)

_表达式_一个代表**WorksheetFunction** 对象的变量。expression A variable that represents a WorksheetFunction object.

参数Parameters

名称Name 必需/可选Required/Optional 数据类型Data type 说明Description
Arg1Arg1 必需Required DoubleDouble x-要预测其值的数据点。x - the data point for which you want to predict a value.
Arg2Arg2 必需Required VariantVariant known_y's-相关的数据数组或数据区域。known_y's - the dependent array or range of data.
Arg3Arg3 必需Required VariantVariant known_x's-独立的数据数组或数据区域。known_x's - the independent array or range of data.

返回值Return value

DoubleDouble

备注Remarks

如果 x 为非数值型, 则Forecast_Linear将返回 #VALUE!If x is nonnumeric, Forecast_Linear returns the #VALUE! error value.

如果_known_y_和_known_x_参数为空或包含不同数量的数据点, 则Forecast_Linear将返回 #N/a 错误值。If known_y and known_x parameters are empty or contain a different number of data points, Forecast_Linear returns the #N/A error value.

如果_known_x_参数的方差等于零, 则Forecast_Linear将返回 #DIV/0!If the variance of known_x parameters equals zero, Forecast_Linear returns the #DIV/0! error value.

Forecast_Linear的计算公式为 +   bx, 其中公式  和   公式以及 x 和 y 的样本平均值平均值 (all known_x) 和 average (all known_y).The equation for Forecast_Linear is a+bx, where   Formula   and   Formula   and where x and y are the sample means AVERAGE(all known_x) and AVERAGE(all known_y).

示例Example

Dim instance As WorksheetFunction
Dim Arg1 As Double
Dim Arg2 As Object
Dim Arg3 As Object
Dim returnValue As Double

returnValue = instance.Forecast_Linear(Arg1, Arg2, Arg3)

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