Index of coincidence

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Index of coincidence

Quality:

Index of coincidence - How often identical letters appear in the same position in two texts. Article “Index of coincidence” in English Wikipedia has 18.8 points for quality (as of July 1, 2025). The article contains 7 references and 6 sections. The article also contains templates indicating quality issues, therefore its score was reduced by 0.99 points.

This article has the best quality in Ukrainian Wikipedia. However, this article is the most popular in English version.

In June 2025 the article “Index of coincidence” was edited by 1 authors in English Wikipedia and written by 1 authors in all languages.

Since the creation of article “Index of coincidence”, its content was written by 56 registered users of English Wikipedia and edited by 161 registered Wikipedia users in all languages.

The article is cited 75 times in English Wikipedia and cited 294 times in all languages.

The highest Authors Interest rank from 2001:

  • Local (English): #8139 in December 2002
  • Global: #11761 in December 2002

The highest popularity rank from 2008:

  • Local (English): #227139 in October 2019
  • Global: #282541 in March 2009

There are 9 language versions for this article in the WikiRank database (of the considered 55 Wikipedia language editions).

The quality and popularity assessment was based on Wikipédia dumps from July 1, 2025 (including revision history and pageviews for previous years).

The table below shows the language versions of the article with the highest quality.

Languages with the highest quality

#LanguageQuality gradeQuality score
1Ukrainian (uk)
Індекс збігів
25.2052
2Russian (ru)
Индекс совпадений
23.5942
3English (en)
Index of coincidence
18.7961
4Vietnamese (vi)
Chỉ số trùng hợp
8.8828
5German (de)
Koinzidenzindex
8.3669
6French (fr)
Indice de coïncidence
6.5484
7Arabic (ar)
مؤشر التطابق
6.1537
8Spanish (es)
Índice de coincidencia
2.0845
9Hungarian (hu)
Egybeesés-számlálás
1.0491
More...

The following table shows the most popular language versions of the article.

Most popular in all the time

The most popular language versions of the article "Index of coincidence" in all the time
#LanguagePopularity awardRelative popularity
1English (en)
Index of coincidence
423 542
2French (fr)
Indice de coïncidence
91 311
3Russian (ru)
Индекс совпадений
71 085
4German (de)
Koinzidenzindex
49 957
5Spanish (es)
Índice de coincidencia
29 857
6Hungarian (hu)
Egybeesés-számlálás
5 520
7Vietnamese (vi)
Chỉ số trùng hợp
5 204
8Ukrainian (uk)
Індекс збігів
3 013
9Arabic (ar)
مؤشر التطابق
318
More...

The following table shows the language versions of the article with the highest popularity in the last month.

Most popular in June 2025

The most popular language versions of the article "Index of coincidence" in June 2025
#LanguagePopularity awardRelative popularity
1English (en)
Index of coincidence
944
2French (fr)
Indice de coïncidence
228
3Russian (ru)
Индекс совпадений
200
4German (de)
Koinzidenzindex
81
5Spanish (es)
Índice de coincidencia
29
6Hungarian (hu)
Egybeesés-számlálás
28
7Vietnamese (vi)
Chỉ số trùng hợp
11
8Ukrainian (uk)
Індекс збігів
5
9Arabic (ar)
مؤشر التطابق
4
More...

The following table shows the language versions of the article with the highest Authors’ Interest.

The highest AI

Language versions of the article "Index of coincidence" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.
#LanguageAI awardRelative AI
1English (en)
Index of coincidence
56
2French (fr)
Indice de coïncidence
35
3German (de)
Koinzidenzindex
23
4Vietnamese (vi)
Chỉ số trùng hợp
10
5Spanish (es)
Índice de coincidencia
9
6Hungarian (hu)
Egybeesés-számlálás
9
7Russian (ru)
Индекс совпадений
8
8Ukrainian (uk)
Індекс збігів
7
9Arabic (ar)
مؤشر التطابق
4
More...

The following table shows the language versions of the article with the highest Authors’ Interest in the last month.

The highest AI in June 2025

Language versions of the article "Index of coincidence" with the highest AI in June 2025
#LanguageAI awardRelative AI
1English (en)
Index of coincidence
1
2Arabic (ar)
مؤشر التطابق
0
3German (de)
Koinzidenzindex
0
4Spanish (es)
Índice de coincidencia
0
5French (fr)
Indice de coïncidence
0
6Hungarian (hu)
Egybeesés-számlálás
0
7Russian (ru)
Индекс совпадений
0
8Ukrainian (uk)
Індекс збігів
0
9Vietnamese (vi)
Chỉ số trùng hợp
0
More...

The following table shows the language versions of the article with the highest number of citations.

The highest CI

Language versions of the article "Index of coincidence" with the highest Citation Index (CI)
#LanguageCI awardRelative CI
1French (fr)
Indice de coïncidence
81
2English (en)
Index of coincidence
75
3Arabic (ar)
مؤشر التطابق
64
4Hungarian (hu)
Egybeesés-számlálás
28
5Vietnamese (vi)
Chỉ số trùng hợp
18
6German (de)
Koinzidenzindex
16
7Russian (ru)
Индекс совпадений
7
8Spanish (es)
Índice de coincidencia
4
9Ukrainian (uk)
Індекс збігів
1
More...

Scores

Estimated value for Wikipedia:
English:
Global:
Popularity in June 2025:
English:
Global:
Popularity in all years:
English:
Global:
Authors in June 2025:
English:
Global:
Registered authors in all years:
English:
Global:
Citations:
English:
Global:

Quality measures

Interwikis

#LanguageValue
arArabic
مؤشر التطابق
deGerman
Koinzidenzindex
enEnglish
Index of coincidence
esSpanish
Índice de coincidencia
frFrench
Indice de coïncidence
huHungarian
Egybeesés-számlálás
ruRussian
Индекс совпадений
ukUkrainian
Індекс збігів
viVietnamese
Chỉ số trùng hợp

Popularity rank trends

Best Rank English:
#227139
10.2019
Global:
#282541
03.2009

AI rank trends

Best Rank English:
#8139
12.2002
Global:
#11761
12.2002

Local AI rank history

Languages comparison

Important global interconnections (July 2024 – June 2025)

Wikipedia readers most often find their way to information on Index of coincidence from Wikipedia articles about Vigenère cipher, Frequency analysis, Kasiski examination, William Frederick Friedman and Rényi entropy. Whereas reading the article about Index of coincidence people most often go to Wikipedia articles on Vigenère cipher, William Frederick Friedman, Kasiski examination, Letter frequency and Bible code.

Cumulative results of quality and popularity of the Wikipedia article

List of Wikipedia articles in different languages (starting with the most popular):

News from 15 February 2026

On 15 February 2026 in multilingual Wikipedia, Internet users most often read articles on the following topics: Jeffrey Epstein, Wuthering Heights, 2026 Winter Olympics, Epstein files, Ilia Malinin, Wuthering Heights, Ghislaine Maxwell, Lucas Pinheiro Braathen, 2026 Winter Olympics medal table, Valentine's Day.

In English Wikipedia the most popular articles on that day were: Jeffrey Epstein, Wuthering Heights, Wuthering Heights (2026 film), 2026 Winter Olympics, Lucas Pinheiro Braathen, Ice hockey at the 2026 Winter Olympics – Men's tournament, Epstein files, John F. Kennedy Jr., Anthony Kim, James Van Der Beek.

About WikiRank

The WikiRank project is intended for automatic relative evaluation of the articles in the various language versions of Wikipedia. At the moment the service allows to compare over 44 million Wikipedia articles in 55 languages. Quality scores of articles are based on Wikipedia dumps from July, 2025. When calculating current popularity and AI of articles data from June 2025 was taken into account. For historical values of popularity and AI WikiRank used data from 2001 to 2025... More information