Wikidata

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

< Wikidata:Database reports‎ | identical birth and death dates

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: 2,638,279 ref
  • (B) Items for people with two people with the same date of birth and date of death (Q20978290): 2,283 ref
  • Ratio (B/A): 0.87 ‰
  • (C) There are 231,809 ref redirects to items with both dates, i.e. two items were merged
  • Ratio (C/A): 8.79 %
  • False positives (B/C): 0.98 % (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
8 December 1917
8 December 1917		 8 January 2009
8 January 2009		 Irène Mélikoff İrene Melikoff human human female female France linguist, turkologist scientist - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
24 June 1921
24 June 1921		 11 April 1979
11 April 1979, 1979		 Nasser Moghadam Ali Hojjat Kashani human human male male Iran Iran politician politician - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2

24 October 1933
17 March 1995		 Kray twins Ronnie Kray identical twins, sibling duo, crime family human, twin male United Kingdom gangster - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
21 October 1851
1851, 21 October 1851		 24 May 1918
1918, 24 May 1918		 Francisco Sánchez Araciel Manuel Sanchez Araciel human human male male Spain Spain sculptor sculptor - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
1 January 1893
 1 January 1973, 1 January 1972
 Karel Korecký Józef Czapran human human male male Czechoslovakia pedagogue, violinist, musician, teacher, composer - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
1893
 1972
 Ilya Vepritski Józef Czapran human human male male Ukraine - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2

1904
1981		 Olga Čepkova Yevdokia Mikhailova human human female female Czech Republic Ukraine farmer - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2

1904
1981		 Olga Čepkova Antonina Działoszyńska human human female female Czech Republic Poland farmer peasant - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
29 May 1904
1904		 25 December 1991
1991		 Jean-Baptist Feilen Napoleonas Šaulys human human male male Germany Lithuania miner - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
6 September 1905
1905		 7 March 2000
2000		 Kató Eőry Anna Schaafsma human human female female Hungary Kingdom of the Netherlands actor - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
1 January 1914
1914		 1 January 1992
1992		 James W. B. Douglas Karel Eckhart human human male male United Kingdom, United Kingdom of Great Britain and Ireland Kingdom of the Netherlands academic, writer - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
18 June 1922
18 June 1922		 4 February 2008
4 February 2008		 Barbro Jansson Richard J. Reed human human female Sweden politician - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
26 August 1923
26 August 1923		 4 December 1997
4 December 1997		 Ferenc Holló Ferenc Holló human human male male Hungary professor, parasitologist, editor-in-chief, veterinarian, university teacher - •correct dates
•merge
•markasduplicate
•markdifferent
•MxM1 MxM2
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