Microsoft Office Tutorials and References
In Depth Information
Using GROWTH to Predict Many Data Points from an Exponential Regression
Using
Using GROWTH
GROWTH to Predict Many Data Points from an Exponential Regression
to Predict Many Data Points from an Exponential Regression
As the TREND function is able to extrapolate points from a linear regres-
sion, the GROWTH function is able to extrapolate points from an exponential
regression.
Syntax
=GROWTH(known_y's,known_x's,new_x's,const)
The GROWTH function calculates predicted exponential growth by using ex-
isting data. GROWTH returns the 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. This function takes the following arguments:
known_y's
known_y's This is the set of y values you already know in the re-
lationship y = b × m^x. If the array known_y'sis in a single column,
each column of known_x'sis interpreted as a separate variable. If
the array known_y'sis in a single row, each row of known_x'sis in-
terpreted as a separate variable. If any of the numbers in known_y's
is 0 or negative, GROWTH returns a #NUM! error.
known_x's
known_x's This is an 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'sand known_x'scan be ranges of any shape, as long as
they have equal dimensions. If more than one variable is used,
known_y'smust be a vector (that is, a range with a height of one row
or a width of one column). If known_x'sis omitted, it is assumed to be
the array {1,2,3,...} that is the same size as known_y's.
Tip
When you have formulas that return arrays, you must enter them
as array formulas after selecting the correct number of cells. To
specify an array formula, you hold down Ctrl+Shift while pressing
Enter.
new_x's
new_x's These are new x values for which you want GROWTH to re-
turn corresponding y values. new_x'smust include a column (or row)
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