Wikidata:Database reports/identical birth and death dates/1

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These are pairs of items with identical dates in date of birth (P569) and date of death (P570). Some should be merged (duplicates), others not: different persons with the same dates (coincidence or virtual twins) or incorrect dates (mixup).

The list is updated regularly (daily?) by bot (items with corrected or removed dates can take a few days to be removed from the list).

How probable are false positives?

  • (A) Items for people with both dates: 3,009,985 ref
  • (B) Items for people with two people with the same date of birth and date of death (Q20978290): 3,145 ref
  • Ratio (B/A): 1.04 ‰
  • (C) There are 301,172 ref redirects to items with both dates, i.e. two items were merged
  • Ratio (C/A): 10.01 %
  • False positives (B/C): 1.04 % (This underestimates it as it assumes that all items had both dates before being merged).

Items in the list below could be:

Type Sample Suggested approach
Items about the same person merge the two items
Items about the same person merge the two items
Items about the same person delete the redirect-sitelink and merge the two items. Special:MergeItems can sometimes merge them directly.
Items about the same person merge the two items
Items about the same person delete the sitelink to the disambiguation page and merge the two items (sitelink didn't get updated on pagemove)
find a new item for the disambiguation page or create it
Items about likely about the same person, but this isn't conclusive add said to be the same as (P460) to each, do not merge them
Items about different people, with incorrect dates and possibly mixed-up sitelinks correct dates and/or fix sitelinks. Don't merge. If in doubt, use the articles' talk pages or WD:IWC
Items about a person and items with dates they shouldn't have remove dates from the item that shouldn't have them
Items for identical persons, but with two articles at the same Wikipedia possibly suggest to Wikipedia to merge both adding Template:Merge (Q6919004) to each article
mark one with instance of (P31): Wikimedia duplicated page (Q17362920) and qualifier of (P642) linking to the other item
Alternatively, interlink both with said to be the same as (P460)
possibly move statements to the one item that isn't marked with Wikimedia duplicated page (Q17362920)
Once the merge of the articles completed, the items can be merged
False positives: two different persons, with same dates of birth and death

double-check dates, ideally with references
interlink both items with different from (P1889) and qualify with criterion used (P1013) = two people with the same date of birth and date of death (Q20978290)
add items to False_positives

Already merged/fixed some of the below (items redirected, labels and statements appear then as identical) do nothing ;)

Steps:

  • Are both items about the same person?
    • If yes:
      • Can the items be merged?
        • If yes: merge them. In the next update, the pair will disappear from the list
        • If no: tag the two articles at Wikipedia for merging. In the next update, the pair will be moved to the "marked for merging" section of the main list.
    • If no:
      • Are the instance of (P31) values correct?
        • If no: correct them
      • Should the item have date of birth (P569)/date of death (P570)?
        • If no: remove them. In one of the next updates, the pair will disappear from the list.
      • Are the dates correct?
        • If no: correct them. In one of the next updates, the pair will disappear from the list.
        • If yes: add the pair to "false positives". In the next update, the pair will disappear from the list.

Update frequency:

  • Removal of merged items: generally daily
  • Removal of items marked as different: generally daily
  • Removal of items with corrected dates: generally weekly (based on Wikidata dumps)
  • Merge of items identified as duplicates and marked for merging at a Wikipedia (if they still include identical dates): occasionally by bot once the merger at Wikipedia is completed.
  • Addition of newly identified items: generally weekly (based on Wikidata dumps)

Tools:

DOBDOD Merged Person 1 Person 2 P31 (#1) P31 (#2) P21 (#1) P21 (#2) P27 (#1) P27 (#2) P106 (#1) P106 (#2) Diff from TO DO
7 October 1853, 4 November 1868
4 November 1868		 30 May 1917, 20 March 1939
20 March 1939		 František Jaroslav Rypáček Karel Ryska human human male male Austria-Hungary pedagogue, writer, poet, teacher, historian, literary historian, local historian, high school teacher, editing staff technician - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2

28 March 1887		 17 November 1940
17 November 1940		 Jamaluddin Muhammad Kasyful Anwar human human male male Indonesia Indonesia 'ālim 'ālim - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
20 July 1893
20 July 1893		 13 October 1955
13 October 1955		 Eusebio Fernández Muñiz Facundo Pascual Quilis human human male male Spain businessperson, sports executive - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
1 July 1919
 28 May 2015
 Hans Bender Hans Bender human Wikimedia disambiguation page male Germany writer, short story writer, editor - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
27 October 1807
27 October 1807		 1 May 1886
1 May 1886		 Charles Lemettre Amelie Lambelin human human male female cooper - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
16 April 1815
16 April 1815		 8 November 1878, 11 August 1878
8 November 1878		 Edward Laenen Edouard Lavergne human human male visual artist - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
20 July 1875
20 July 1875		 1932, 13 March 1932
13 March 1932		 Antonin Schlesinger Hans Schlesinger human human male male Catholic priest painter - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
20 January 1881
20 January 1881, 10 April 1939		 14 January 1982
14 January 1982		 Ernst Dubach Albert Dubach human human male male Switzerland Switzerland sport cyclist sport cyclist - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
28 January 1903
28 January 1903, 1903		 15 March 1978
15 March 1978, 1978		 Aleksander Kamiński Juliusz Górecki human human male Poland historian - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
21 February 1903
21 February 1903		 10 December 1995
10 December 1995		 Jožka Králíková Josefa Mattesová human human female female opera singer librarian - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
1916
1916		 1993
1993		 Vanda Mozheiko Anna Bogush human human female female Belarus Belarus - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
18 September 1929
1929		 5 August 1986
1986		 Francis Zagorskis Willie Patterson human human male male Latvia United Kingdom scientist, farmer comics artist - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
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