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FORECAST.LINEAR

See FORECAST

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Statistical

The FORECAST function in Google Sheets is used to predict a future value based on linear regression analysis of existing data.

It calculates the best-fit straight line (linear trend line) through a set of known x and y values and then uses that line to predict the y-value for a given x-value.

The syntax for the FORECAST function is as follows:

FORECAST(x, datay, datax)

x: The x-value or the point at which you want to predict the y-value.

data_y: The known y-values or the dependent variable.

data_x: The known x-values or the independent variable.

The FORECAST function will return the predicted y-value corresponding to the provided x-value, based on the linear trend line calculated from the known data points.

Using the same example as before, suppose you have a set of data with x-values in column A and corresponding y-values in column B. You want to predict the y-value for an x-value of 10.

A\tB 1\t10 2\t15 3\t20 4\t25 5\t30

You can use the following formula in a cell to predict the y-value for x=10 using the FORECAST function:

=FORECAST(10, B1:B5, A1:A5)

This will calculate the linear trend line based on the known data points and predict the y-value corresponding to x=10.

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