[Table of Contents] [docx version]
SpreadsheetML Reference Material - Table of Contents
GROWTH ( known-ys [ , [ known-xs ] [ , [ new-xs ] [ , const-flag ] ] )
Description: Computes predicted exponential growth by using existing data. GROWTH can also fit an exponential curve to existing x-values and y-values.
Arguments:
|
Name |
Type |
Description |
|
known-ys |
array |
Set of y-values already known in the relationship y=b*mx. If the array known-ys is a single column, then each column of known-xs is interpreted as a separate variable. If the array known-ys is a single row, then each row of known-xs is interpreted as a separate variable. |
|
known-xs |
array |
Set of x-values that might already be know in the relationship y=b*mx. The array known-xs can include one or more sets of variables. If only one variable is used, known-ys and known-xs can be ranges of any shape, as long as they have equal dimensions. If more than one variable is used, known-ys must be a vector (that is, a known-ys with a height of one row or a width of one column). If known-xs is omitted, it is assumed to be the array {1,2,3,...} that is the same size as known-ys. |
|
new-xs |
array |
A set of new x-values for which GROWTH is to return corresponding y-values. new-xs shall include a column (or row) for each independent variable, just as known-xs does. So, if known-ys is in a single column, known-xs and new-xs shall have the same number of columns. If known-ys is in a single row, known-xs and new-xs shall have the same number of rows. If new-xs are omitted, it is assumed to be the array {1,2,3,...} that is the same size as known-ys. |
|
const-flag |
logical |
Specifies whether to force the constant b to equal 1. If TRUE or omitted, b is calculated normally. If FALSE, b is set equal to 1 and the m-values are adjusted so that y= mx. |
Return Type and Value: array – The y-values for a series of new x-values.
However, if any of the numbers in known-ys are zero or negative, #NUM! is returned.
[Example: Given the following data:
|
|
A |
B |
C |
|
1 |
Month |
Units |
Formula (corresponding units) |
|
2 |
11 |
33,100 |
32618.20377 |
|
3 |
12 |
47,300 |
47729.42261 |
|
4 |
13 |
69,000 |
69841.30086 |
|
5 |
14 |
102,000 |
102197.0734 |
|
6 |
15 |
150,000 |
149542.4867 |
|
7 |
16 |
220,000 |
218821.8762 |
|
8 |
Month |
Formula (Predicted Units) |
|
|
9 |
17 |
320,196.72 |
|
|
10 |
18 |
468,536.05 |
|
When GROWTH(A2:B4,A6:B8) is array-entered into cells C2:C7, those cells take on the results shown.
When GROWTH(A2:B4,A6:B8,A9:A10) is array-entered into cells B9:B10, those cells take on the results shown.
end example]