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

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{{DISPLAYTITLE:FORECAST function}}
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== FORECAST ==
 
== FORECAST ==
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<tt>'''FORECAST(new_xvalue; yvalues; xvalues)'''</tt>
 
<tt>'''FORECAST(new_xvalue; yvalues; xvalues)'''</tt>
 
: <tt>'''yvalues'''</tt> and <tt>'''xvalues'''</tt> are single row or column ranges specifying points in a set of data. <tt>'''yvalues'''</tt> and <tt>'''xvalues'''</tt> must be the same size.  
 
: <tt>'''yvalues'''</tt> and <tt>'''xvalues'''</tt> are single row or column ranges specifying points in a set of data. <tt>'''yvalues'''</tt> and <tt>'''xvalues'''</tt> must be the same size.  
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: <tt>'''FORECAST'''</tt> fits a straight data through these data points, using the linear regression method.
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: <tt>'''FORECAST'''</tt> fits a straight line through these data points, using the linear regression method.
  
 
: <tt>'''FORECAST'''</tt> returns the y value on the straight line found, corresponding to the x value in <tt>'''new_xvalue'''</tt>. It is equivalent to <tt>'''TREND(yvalues; xvalues; new_xvalue)'''</tt>.
 
: <tt>'''FORECAST'''</tt> returns the y value on the straight line found, corresponding to the x value in <tt>'''new_xvalue'''</tt>. It is equivalent to <tt>'''TREND(yvalues; xvalues; new_xvalue)'''</tt>.
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: with the same x values and y values, also returns <tt>'''13'''</tt>.
 
: with the same x values and y values, also returns <tt>'''13'''</tt>.
  
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=== See also: ===
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{{SeeAlso|EN|
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[[Documentation/How_Tos/Calc: TREND function|'''TREND''']],
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* [[Documentation/How_Tos/Calc: TREND function|TREND]]
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[[Documentation/How_Tos/Calc: INTERCEPT function|'''INTERCEPT''']],
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* [[Documentation/How_Tos/Calc: INTERCEPT function|INTERCEPT]]
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[[Documentation/How_Tos/Calc: SLOPE function|'''SLOPE''']],
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* [[Documentation/How_Tos/Calc: SLOPE function|SLOPE]]
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[[Documentation/How_Tos/Calc: STEY function|'''STEY''']]
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* [[Documentation/How_Tos/Calc: STEYX function|STEYX]]
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* [[Documentation/How_Tos/Calc: Statistical functions|Statistical functions]]
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[[Documentation/How_Tos/Calc: Statistical functions|'''Statistical functions''']]
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* [[Documentation/How_Tos/Calc: Functions listed alphabetically|Functions listed alphabetically]]
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* [[Documentation/How_Tos/Calc: Functions listed by category|Functions listed by category]]}}
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[[Category: Documentation/Reference/Calc/Statistical functions]]

Latest revision as of 14:42, 2 February 2024



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.


See Also
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