Forecast the exponential growth value based on the available data. Based on the existing x and y values, the GROWTH function returns a new set of y values corresponding to the x values.
You can use the GROWTH worksheet function to fit an exponential curve that satisfies the existing x and y values.
grammar
GROWTH(known_y’s,known_x’s,new_x’s,const)
known_y’s is a known set of y values that satisfy the exponential regression fitting curve y=b*m^x.
- If the array known_y’s is in a separate column, each column of known_x’s is treated as an independent variable.
- If the array known-y’s is in a separate row, then each row of known-x’s is treated as an independent variable.
- If any number in known_y*s is zero or negative, the GROWTH function returns the error value #NUM! .
known_x’s is an optional parameter for a known set of x values satisfying the exponential regression fitting curve y=b*m^x.
- The array known_x’s can contain one or more sets of variables.
If only one variable is used, known_y’s and known_x’s can be regions of any shape as long as they have the same dimension.
If more than one variable is used, known_y’s must be a vector (that is, must be a range of a row or column).
- If known_x’s is omitted, the array is assumed to be {1,2,3,… }, which is the same size as known_y’s.
new_x’s is a new set of x values corresponding to y values that need to be returned via the GROWTH function.
New_x’s, like known_x’s, must include a separate column (or row) for each independent variable.
Therefore, if known_y’s is single-column, known_x’s and new_x’s should have the same number of columns.
If known_y’s is single-line, known_x’s and new_x’s should have the same number of lines.
- If new_x’s is omitted, it is assumed to be the same as known_x’s.
- If known_x’s and new_x’s are omitted, they are assumed to be arrays {1,2,3,… }, which is the same size as known_y’s.
const is a logical value that specifies whether to force the constant b to be 1.
- If const is TRUE or omitted, b will be calculated as normal.
If const is FALSE, b will be set to 1 and m will be adjusted to satisfy y = m^x.
Instructions
- For formulas that return an array, the correct number of cells must be entered as an array formula.
- When entering array constants for arguments such as known_x’s, you should use commas to separate data in the same line and semicolons to separate data in different lines.
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