Difference between revisions of "SigmaXX Command"
From GeoGebra Manual
m (Text replace - "<div class="box info"> 48px|left This page is part of the official manual for print and pdf. For structural reasons normal users can't edit this page. If you found any errors on this page please contact ) |
|||
Line 1: | Line 1: | ||
<noinclude>{{Manual Page|version=4.2}}</noinclude> | <noinclude>{{Manual Page|version=4.2}}</noinclude> | ||
{{command|statistics}} | {{command|statistics}} | ||
− | ; SigmaXX[ <List of | + | |
+ | ;SigmaXX[ <List of Points> ] | ||
+ | :Calculates the sum of squares of the ''x''-coordinates of the given points. | ||
+ | :{{Example|1=Let <code><nowiki>list = { (-3, 4), (-1, 4), (-2, 3), (1, 3), (2, 2), (1, 5) }</nowiki></code> be a list of points. <code><nowiki>SigmaXX[ Liste ]</nowiki></code> yields ''a = 20''.}} | ||
+ | |||
+ | |||
+ | ;SigmaXX[ <List of Raw Data> ] | ||
+ | :Calculates the sum of squares of the given numbers. | ||
:{{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 | + | |
− | + | ||
+ | ; SigmaXX[ <List of Numbers>, <List of Frequencies> ] | ||
+ | :Calculates the weighted sum of squares of the given numbers. | ||
+ | :{{Example|1= Let <code><nowiki>list = {3, 2, 4, 3, 3, 2, 1, 1, 2, 3, 3, 4, 5, 3, 2, 1, 1, 2, 3}</nowiki></code> be a list of numbers. <code><nowiki>Unique[ list1 ]</nowiki></code> yields ''list2 = {1, 2, 3, 4, 5}'' and <code><nowiki>Frequency[ list1 ]</nowiki></code> yields ''list3 = {4, 5, 7, 2, 1}''. Command <code><nowiki>SigmaXX[ list2, list3 ]</nowiki></code> yields ''a = 144''.}} |
Revision as of 11:33, 16 July 2013
- SigmaXX[ <List of Points> ]
- Calculates the sum of squares of the x-coordinates of the given points.
- Example: Let
list = { (-3, 4), (-1, 4), (-2, 3), (1, 3), (2, 2), (1, 5) }
be a list of points.SigmaXX[ Liste ]
yields a = 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
list = {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 a = 144.