Difference between revisions of "Documentation/How Tos/Calc: SLOPE function"
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Revision as of 12:39, 17 May 2010
SLOPE
Fits a straight line to data using linear regression and returns its slope.
Syntax:
SLOPE(yvalues; xvalues)
- yvalues and xvalues are single row or column ranges specifying points in a set of data. yvalues and xvalues must be the same size.
- SLOPE fits a straight line through these data points, using the linear regression method (least squares). It then returns the slope of that line.
- The equation of a straight line may be given as y = a + bx. The linear regression method calculates:
- and
- b is the slope, returned by this function.
- Advanced topic:
- The parameters xvalues and yvalues are always evaluated as array formulas.
Example:
SLOPE(B2:B6; A2:A6)
- where the x values in A2:A6 are 1, 2, 3, 4, 5 and the y values in B2:B6 are 2, 4, 6, 8, 11 returns 2.2. The equation of the straight line found is very nearly y = 2x - thus the slope is very nearly (but not quite) 2.