LOGEST

This function calculates an exponential curve that fits the data and returns an array of values that describes the curve.

LOGEST(y,x,constant,stats)

The equation for the curve is y=b*m^x or y=(b*(m1^x1)*(m2^x2)*_).

This function has these arguments:

Argument	Description
y	Set of y values that are known in the relationship y=b*m^x
x	(Optional) X is an optional set of x values that may be known in the relationship y=mx+b
constant	Logical value that specifies whether to force the constant b to equal 0. If true or omitted then b is calculated normally; if false then b is equal to 0 and the m values are adjusted so that y=m^x.
stats	Logical value that specifies whether to return additional regression statistics. If true, then the additional regression statistics are returned if false or omitted then only the m-coefficients and b are returned.

If x is omitted then x defaults to the array {1,2,3...}, that has the same dimensions as y.

Use the INDEX function to get individual elements from the returned array.

Accepts an array. Returns an array.

LOGEST(A2:A7,C2:C7,TRUE,FALSE)

This function is available in product version 2.0 or later.