Difference between revisions of "SigmaXX Command"

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:{{Example|1=In order to work out the variance of a list you may use <code>SigmaXX[list] / Length[list] - Mean[list]^2</code>.}}
 
:{{Example|1=In order to work out the variance of a list you may use <code>SigmaXX[list] / Length[list] - Mean[list]^2</code>.}}
 
; SigmaXX[ <List of Points> ]: Calculates the sum of squares of the ''x''-coordinates of the given points.
 
; SigmaXX[ <List of Points> ]: Calculates the sum of squares of the ''x''-coordinates of the given points.
; SigmaXX[ <List of Numbers>, <List of Frequencies> ]
+
; SigmaXX[ <List of Numbers>, <List of Frequencies> ]: Calculates the weighted sum of squares of the given numbers.

Revision as of 15:56, 3 January 2013


SigmaXX[ <List of Numbers> ]
Calculates the sum of squares of the given numbers.
Example: In order to work out the variance of a list you may use SigmaXX[list] / Length[list] - Mean[list]^2.
SigmaXX[ <List of Points> ]
Calculates the sum of squares of the x-coordinates of the given points.
SigmaXX[ <List of Numbers>, <List of Frequencies> ]
Calculates the weighted sum of squares of the given numbers.
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