Difference between revisions of "Documentation/How Tos/Calc: GROWTH function"

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* [[Documentation/How_Tos/Calc:_FREQUENCY_function|<div style="font-size: 120%;">Frequency]]
 
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== GROWTH ==
 
== GROWTH ==

Revision as of 15:28, 29 January 2024

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GROWTH

Fits an exponential curve to a data set, and returns points on that curve.

Syntax:

GROWTH(yvalues; xvalues; new_xvalues; allow_factor)

data is a range or array containing numerical data.
yvalues and xvalues are single row or column ranges specifying points in a set of data.
GROWTH fits an exponential curve of the form y=bmx through these data points, using the linear regression method.
If allow_factor is FALSE the factor b in this equation is set to 1; if allow_factor is non-zero, TRUE or omitted the factor b is calculated from the data.
GROWTH returns an array of the y values of the exponential curve found, corresponding to the x values in new_xvalues (or if omitted xvalues). It must be entered as an array formula (for example by using Cntrl-Shift-Enter rather than just Enter).
yvalues and xvalues must be the same size. new_xvalues may have a different size.

Example:

Calc growth example.png

=GROWTH(B2:B6; A2:A6; A2:A7)

when entered as an array formula in cell C2, where the x values in A2:A7 are 4, 5, 6, 7, 8, 9 and the y values in B2:B6 are 1.80, 3.20, 6.20, 12.30, 24.50, finds a best fit exponential curve for those points, and in C2:C7 returns y values on that curve for the x values in A2:A7.
This example shows how GROWTH may be used to predict future values (A7,C7).



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