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

Revision as of 17:31, 29 May 2012

Returns the covariance of two sets of data.

COVAR(x;y)

where x and y are ranges or arrays containing the two sets of data.

COVAR calculates:

\text{[math]}

where

\text{[math]}

and

\text{[math]}

are the averages of the ranges x and y.

Advanced topic:

The function COVAR(x;y) is automatically evaluated as array formula.

COVAR(A1:A30; B1:B30)

returns the covariance of the two sets of data in A1:A30 and B1:B30.

@@ Line 5: / Line 5: @@
 === Syntax: ===
-<tt>'''COVAR(x; y)'''</tt>
+<code>COVAR(x;y)</code>
-: where <tt>'''x'''</tt> and <tt>'''y'''</tt> are ranges or arrays containing the two sets of data.
+: where <code>x</code> and <code>y</code> are ranges or arrays containing the two sets of data.
-:<tt>'''COVAR'''</tt> calculates:
+:<code>COVAR</code> calculates:
-::[[Image:Calc_covar_equation.png]]
+:<math>\frac{1} {n} \sum_{i} {(x_i - \bar x)(y_i - \bar y)}</math>
-:: where [[Image:Calc_xymean.png]] are the averages of <i>x</i>,<i>y</i>.
+:: where <math>\bar x</math> and <math>{\bar y}</math> are the averages of the ranges <code>x</code> and <code>y</code>.
 : <i>Advanced topic:</i>
-: The parameters <tt>'''x'''</tt> and <tt>'''y'''</tt> are always evaluated as [[Documentation/How_Tos/Using Arrays|array formulas]].
+: The function <code>COVAR(x;y)</code> is automatically evaluated as [[Documentation/How_Tos/Using Arrays|array formula]].
 === Example: ===