If you need to, you can adjust the column widths to see all the data. For formulas to show results, select them, press F2, and then press Enter. The equation for FORECAST and FORECAST.LINEAR is a+bx, where:Īnd where x and y are the sample means AVERAGE(known_x's) and AVERAGE(known y's).Ĭopy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. If the variance of known_x's equals zero, then FORECAST and FORECAST.LINEAR return the #DIV/0! error value. If known_y's or known_x's is empty or one has more data points than the other, FORECAST and FORECAST.LINEAR return the #N/A error value. If x is nonnumeric, FORECAST and FORECAST.LINEAR return the #VALUE! error value. The data point for which you want to predict a value. The FORECAST/FORECAST.LINEAR function syntax has the following arguments: You can use these functions to predict future sales, inventory requirements, or consumer trends. The existing values are known x-values and y-values, and the future value is predicted by using linear regression. The future value is a y-value for a given x-value. DescriptionĬalculate, or predict, a future value by using existing values. It's still available for backward compatibility, but consider using the new FORECAST.LINEAR function instead. I cannot just manually write out this equation in a cell because the chart trendline will change as the chart input data changes by month. The syntax and usage of the two functions are the same, but the older FORECAST function will eventually be deprecated. For example, if the trendline equation is y-0.407ln(x)+5.7609, I want the user to be able to enter an x value (quantity) in one cell and another cell outputs the corresponding y value (unit price). If const is FALSE, b is set equal to 0 (zero), and the m-values are adjusted so that y = mx.Note: In Excel 2016, the FORECAST function was replaced with FORECAST.LINEAR as part of the new Forecasting functions. If const is TRUE or omitted, b is calculated normally. If known_x's is omitted, it is assumed to be the array that is the same size as known_y's.Ī logical value specifying whether to force the constant b to equal 0 If more than one variable is used, known_y's must be a vector (that is, a range with a height of one row or a width of one column). If only one variable is used, known_y's and known_x's can be ranges of any shape, as long as they have equal dimensions. The array known_x's can include one or more sets of variables. If the array known_y's is in a single row, then each row of known_x's is interpreted as a separate variable.Īn optional set of x-values that you may already know in the relationship y = mx + b If the array known_y's is in a single column, then each column of known_x's is interpreted as a separate variable. In Excel 2016, the FORECAST function was replaced with FORECAST.LINEAR as part of.
The set of y-values you already know in the relationship y = mx + b The future value is a y-value for a given x-value. The TREND function syntax has the following arguments:
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