# Difference between revisions of "SigmaXX Command"

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##### SigmaXX

This article is about GeoGebra command.

##### Command Categories (All commands)

SigmaXX[ <List of Points> ]
Calculates the sum of squares of the x-coordinates of the given points.
Example: Let `list1 = { (-3, 4), (-1, 4), (-2, 3), (1, 3), (2, 2), (1, 5) }` be a list of points. `SigmaXX[ list1 ]` yields the value 20.

SigmaXX[ <List of Raw Data> ]
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 Numbers>, <List of Frequencies> ]
Calculates the weighted sum of squares of the given numbers.
Example: Let `list1 = {3, 2, 4, 3, 3, 2, 1, 1, 2, 3, 3, 4, 5, 3, 2, 1, 1, 2, 3}` be a list of numbers. `Unique[ list1 ]` yields list2 = {1, 2, 3, 4, 5} and `Frequency[ list1 ]` yields list3 = {4, 5, 7, 2, 1}. Command `SigmaXX[ list2, list3 ]` yields the value 144.
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