Variance: Revision history

14 November 2024

• curprev 00:0400:04, 14 November 2024 35.139.154.158 talk 59,403 bytes −120 Undid revision 1257236284 by 78.190.200.135 (talk) not particularly relevant undo Tag: Undo

13 November 2024

• curprev 22:4922:49, 13 November 2024 78.190.200.135 talk 59,523 bytes +120 "Calculus of variations" , "Combination" , "p-variation" , "Permutation" and "Total variation" added to See also. undo Tags: Reverted Visual edit

9 November 2024

• curprev 12:2712:27, 9 November 2024 Zlmark talk contribs 59,403 bytes −5 →Moment of inertia: added missing reference undo
• curprev 12:2512:25, 9 November 2024 Zlmark talk contribs 59,408 bytes −38 No edit summary undo
• curprev 12:2412:24, 9 November 2024 Zlmark talk contribs 59,446 bytes +236 added reference for the analogy between the use of the term "moment" in statistics and mechanics undo Tags: Visual edit Newcomer task Newcomer task: references

24 October 2024

• curprev 07:2307:23, 24 October 2024 2a02:3100:4763:5b00:bd51:9f82:d847:6814 talk 59,210 bytes 0 →Definition: Lowercase undo Tags: Mobile edit Mobile web edit

23 August 2024

• curprev 09:0909:09, 23 August 2024 80.187.103.156 talk 59,210 bytes 0 Fix typo undo

30 July 2024

• curprev 11:0911:09, 30 July 2024 Yeulay talk contribs 59,210 bytes 0 →Sample variance undo
• curprev 11:0811:08, 30 July 2024 Yeulay talk contribs 59,210 bytes +291 →{{visible anchor|Biased sample variance}} undo
• curprev 11:0011:00, 30 July 2024 Yeulay talk contribs 58,919 bytes +291 →Population variance undo

27 June 2024

• curprev 20:4020:40, 27 June 2024 104.187.53.82 talk 58,628 bytes +80 No edit summary undo

11 June 2024

• curprev 05:2805:28, 11 June 2024 128.250.0.209 talk 58,548 bytes −2 →Linear combinations: In the summation you are already double counting, thus you do not need the prefactor of 2. This can be seen a few lines down in a similar calculation. undo

16 May 2024

• curprev 11:0011:00, 16 May 2024 Frankjohnbolton talk contribs m 58,550 bytes +93 Added an additional line to clarify how the middle term is combined with the last term undo

14 May 2024

• curprev 10:0410:04, 14 May 2024 147.210.179.67 talk 58,457 bytes +3 →Linear combinations undo

29 April 2024

• curprev 06:2406:24, 29 April 2024 Anachronist talk contribs 58,454 bytes −138 Undid revision 1221310136 by 50.24.144.206 (talk) - already stated in the first sentence of that same paragraph undo Tag: Undo
• curprev 04:2704:27, 29 April 2024 50.24.144.206 talk 58,592 bytes +138 No edit summary undo Tags: Reverted Mobile edit Mobile web edit

31 March 2024

• curprev 20:2720:27, 31 March 2024 35.139.154.158 talk 58,454 bytes −15 Undid revision 1216547739 by Maljuboori (talk) it was already correct, and there isn't any particular reason to change it thus undo Tag: Undo
• curprev 17:1817:18, 31 March 2024 Maljuboori talk contribs m 58,469 bytes +15 Fixed general formula for variance of sum of random variables. undo Tags: Reverted Visual edit

20 March 2024

• curprev 22:4122:41, 20 March 2024 Goodphy talk contribs 58,454 bytes −46 →Example: Added which functions in Excel gives unbiased sample / population variance, and removed a confusing sentence. undo Tag: Visual edit

8 March 2024

• curprev 22:3422:34, 8 March 2024 HeyElliott talk contribs 58,500 bytes +249 Category:All articles with bare URLs for citations, added archives, MOS:T, ce undo Tag: 2017 wikitext editor

23 February 2024

• curprev 09:2809:28, 23 February 2024 192.76.8.77 talk 58,251 bytes +2 →{{visible anchor|Biased sample variance}} undo

22 February 2024

• curprev 22:5222:52, 22 February 2024 Goodphy talk contribs 58,249 bytes +139 →Distribution of the sample variance: Added S^2 and sigma^2 are the unbiased sample variance and population variance respectively and removed unnecessary empty spaces before and after each mathematical formula in the section Population variance. undo Tag: Visual edit
• curprev 01:5201:52, 22 February 2024 Goodphy talk contribs 58,110 bytes +158 →Example: Clarified the example for population and sample variances. undo Tag: Visual edit

20 February 2024

• curprev 23:0023:00, 20 February 2024 Goodphy talk contribs 57,952 bytes +424 →Population variance and sample variance: Added a section Example to understand population variance and sample variance. undo Tag: Visual edit

18 February 2024

• curprev 22:5022:50, 18 February 2024 Goodphy talk contribs 57,528 bytes +36 →Population variance and sample variance: Corrected a word (the variance of the sample instead of the population variance of the sample). undo Tag: Visual edit

17 February 2024

• curprev 15:4215:42, 17 February 2024 Goodphy talk contribs 57,492 bytes +230 Added a formula helping to understand the main formula. undo Tag: Visual edit
• curprev 01:1801:18, 17 February 2024 Goodphy talk contribs 57,262 bytes +496 →Population variance: Added a supplementary note helping understanding formulas. undo Tag: Visual edit

16 February 2024

• curprev 23:4423:44, 16 February 2024 Goodphy talk contribs 56,766 bytes +198 Added guides of how formulas ar undo Tag: Visual edit

22 January 2024

• curprev 22:4722:47, 22 January 2024 MrOllie talk contribs 56,568 bytes −40 Undid revision 1198074433 by Goodphy (talk) redundant with the previous sentence undo Tag: Undo
• curprev 22:4522:45, 22 January 2024 Goodphy talk contribs 56,608 bytes +40 Clarified the meaning of "sample" in the introductory section. undo Tags: Reverted Visual edit
• curprev 22:4522:45, 22 January 2024 MrOllie talk contribs 56,568 bytes −122 confusing and does not belong in the opening paragraph undo
• curprev 22:4322:43, 22 January 2024 Goodphy talk contribs 56,690 bytes +45 Added what SD is (Standard Deviation). undo Tag: Visual edit
• curprev 22:4022:40, 22 January 2024 Goodphy talk contribs 56,645 bytes +122 In the introductory section, added why the squared deviation is selected in the definition of variance.. undo Tag: Visual edit

4 January 2024

• curprev 07:1807:18, 4 January 2024 Ghosts of Europa talk contribs 56,523 bytes +43 Add uncited template undo

20 December 2023

• curprev 13:3713:37, 20 December 2023 194.171.56.13 talk 56,480 bytes +353 add one extra step, so it is clear where \frac{n - 2}{n} originates from undo

14 December 2023

• curprev 13:4513:45, 14 December 2023 Tito Omburo talk contribs 56,127 bytes −2 no need for piped link undo Tag: Undo

12 December 2023

• curprev 01:0501:05, 12 December 2023 DMH223344 talk contribs 56,129 bytes +28 correct definition undo Tags: Reverted Visual edit

28 November 2023

• curprev 07:4107:41, 28 November 2023 Sunil256 talk contribs m 56,101 bytes −26 No edit summary undo Tag: Reverted

7 November 2023

• curprev 11:2311:23, 7 November 2023 Tito Omburo talk contribs 56,127 bytes 0 Moved etymology way down, according to importance as determined by prevalence in reliable sources undo
• curprev 11:2011:20, 7 November 2023 Tito Omburo talk contribs 56,127 bytes −40 →Definition: Gives the standard definition of the variance, which uses the expectation and so forth. A technical subject! undo

17 October 2023

• curprev 21:3021:30, 17 October 2023 Baane247 talk contribs 56,167 bytes +3 changed "expectation" to "expected value" in the lead. undo

30 September 2023

• curprev 20:0320:03, 30 September 2023 AnomieBOT talk contribs m 56,164 bytes −25 Substing templates: {{Format ISBN}}. See User:AnomieBOT/docs/TemplateSubster for info. undo
• curprev 19:1019:10, 30 September 2023 Trappist the monk talk contribs m 56,189 bytes +48 cite repair; undo Tag: AWB

28 September 2023

• curprev 19:5919:59, 28 September 2023 Kri talk contribs 56,141 bytes +240 →As a scalar: Rephrased incorrect sentence (what is considered is not the variance of the Euclidean distance, but a reinterpretation of the scalar variance where X - μ is interpreted with the Euclidean distance between X and μ, or where simply (X - μ)² is interpreted as the scalar product of X - μ with itself). undo

19 September 2023

• curprev 13:5013:50, 19 September 2023 St.nerol talk contribs 55,901 bytes +18 restoring expectation to definition undo Tags: Visual edit: Switched Disambiguation links added

29 August 2023

• curprev 20:2520:25, 29 August 2023 Lambiam talk contribs 55,883 bytes +38 →Sample variance: anchors undo

13 August 2023

• curprev 13:2213:22, 13 August 2023 LuckSquared talk contribs m 55,845 bytes +1 reordered the terms in variance calculation, such that the terms of the integrands for var(X) and var(X^2) are separated in meaningful terms as x*p(x) and x^2*p(x), rather than being mixed. undo Tag: Visual edit

5 August 2023

• curprev 20:2420:24, 5 August 2023 2601:646:a001:1e30:48d8:d064:7cb9:e782 talk 55,844 bytes −70 The standard deviation of X is not used in any of the preceding equations. Including it here is a non-sequitur. undo

4 August 2023

• curprev 22:2122:21, 4 August 2023 12.11.236.18 talk 55,914 bytes −56 →Propagation: The simplification of the equation in the variance of a sum of two random variables to (a\sigma_X - b\sigma_Y)^2 is only correct if X and Y are perfectly correlated undo

18 July 2023

• curprev 05:1605:16, 18 July 2023 Alojaco1 talk contribs m 55,970 bytes 0 →Sum of uncorrelated variables with random sample size: Change "N=n" to "n=N" undo