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GROWTH

Category: Statistical Function.

Description: Calculates predicted exponential growth by using existing data.

GROWTH returns y-values for a series of new x-values that you specify by using existing x-values and y-values.

You can also use the GROWTH worksheet function to fit an exponential curve to existing x-values and y-values.

Syntax: GROWTH(known_y's, [known_x's], [new_x's], [const])

The GROWTH function syntax has the following arguments:

Known_y's: set of y-values you already know in the relationship y = b*m^x.

If the array known_y's is in a single column, then each column of known_x's is interpreted as a separate variable.
If the array known_y's is in a single row, then each row of known_x's is interpreted as a separate variable.
If any of the numbers in known_y's is 0 or negative, GROWTH returns the #NUM! error value.

Known_x's: optional set of x-values that you may already know in the relationship y = b*m^x.

The array known_x's can include one or more sets of variables.

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.

If more than one variable is used, known_y's must be a vector.
If known_x's is omitted, it is assumed to be the array {1,2,3,...} that is the same size as known_y's

New_x's: new x-values for which you want GROWTH to return corresponding y-values.

New_x's must include a column (or row) for each independent variable just as known_x's does.

So if known_y's is in a single column, known_x's and new_x's must have the same number of columns. If known_y's is in a single row, known_x's and new_x's must have the same number of rows.
If new_x's is omitted, it is assumed to be the same as known_x's.
If both known_x's and new_x's are omitted, they are assumed to be the array {1,2,3,...} that is the same size as known_y's.

Const: logical value specifying whether to force the constant b to equal 1.