Difference between revisions of "SigmaXX Command"
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Revision as of 11:10, 29 July 2015
- 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} andFrequency[ list1 ]
yields list3 = {4, 5, 7, 2, 1}. CommandSigmaXX[ list2, list3 ]
yields the value 144.