Using Forecast function in excel to predict or calculate a future value along a linear trend by using existing values


This is one of my favourite useful tips in Excel. Sometime, you have a less-accurate data set with a lower resolution. However, partial data cannot be fit into the program. You will need to do the interpolation. And you can use the forecast function in excel to accomplish this. The syntax for this function (take C/C++ for example) is:

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double forecast(double x, double *ys, double *xs);
double forecast(double x, double *ys, double *xs);

The forecast will return a predicted future value given on the existing series y’ = f(x’) the series is assumed linear trend. Given a input x the value will be interpolated.

excel-forcast-linear Using Forecast function in excel to predict or calculate a future value along a linear trend by using existing values beginner excel Office tricks

Excel Forcast

You can drag and drop the cells in excel to auto-complete the formulas for an area of cells.

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