Difference between revisions of "Documentation/How Tos/Calc: FORECAST function"
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| − | : The parameters <tt>'''xvalues'''</tt> and <tt>'''yvalues'''</tt> are always evaluated as | + | : The parameters <tt>'''xvalues'''</tt> and <tt>'''yvalues'''</tt> are always evaluated as [[Documentation/How_Tos/Using Arrays|array formulas]]. Note that <tt>'''TREND'''</tt> does <u>not</u> evaluate its parameters as array formulas. |
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{{Documentation/SeeAlso| | {{Documentation/SeeAlso| | ||
* [[Documentation/How_Tos/Calc: TREND function|TREND]], | * [[Documentation/How_Tos/Calc: TREND function|TREND]], | ||
| − | * [[Documentation/How_Tos/Calc: INTERCEPT function|INTERCEPT]] | + | * [[Documentation/How_Tos/Calc: INTERCEPT function|INTERCEPT]] |
| − | * [[Documentation/How_Tos/Calc: SLOPE function|SLOPE]] | + | * [[Documentation/How_Tos/Calc: SLOPE function|SLOPE]] |
* [[Documentation/How_Tos/Calc: STEYX function|STEYX]] | * [[Documentation/How_Tos/Calc: STEYX function|STEYX]] | ||
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* [[Documentation/How_Tos/Calc: Statistical functions|Statistical functions]] | * [[Documentation/How_Tos/Calc: Statistical functions|Statistical functions]] | ||
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* [[Documentation/How_Tos/Calc: Functions listed alphabetically|Functions listed alphabetically]] | * [[Documentation/How_Tos/Calc: Functions listed alphabetically|Functions listed alphabetically]] | ||
* [[Documentation/How_Tos/Calc: Functions listed by category|Functions listed by category]]}} | * [[Documentation/How_Tos/Calc: Functions listed by category|Functions listed by category]]}} | ||
Revision as of 13:58, 25 February 2009
FORECAST
Fits a straight line to data using linear regression and returns a point on that line.
Syntax:
FORECAST(new_xvalue; 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.
- FORECAST fits a straight line through these data points, using the linear regression method.
- FORECAST returns the y value on the straight line found, corresponding to the x value in new_xvalue. It is equivalent to TREND(yvalues; xvalues; new_xvalue).
- Advanced topic:
- The parameters xvalues and yvalues are always evaluated as array formulas. Note that TREND does not evaluate its parameters as array formulas.
Example:
FORECAST(6; 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, 7, 8, 11 returns 13.
TREND(B2:B6; A2:A6; 6)
- with the same x values and y values, also returns 13.
