An RfC has come along proposing to do away with Persondata. As someone who has invested a lot of time in using Persondata I am in principle against this proposal. Wikipedia:Village pump (proposals)#RfC: Should Persondata template be removed from articles?

The alternative of Wikidata is certainly the way forward, but my impression is that it will not be kept up to date. This is just a gut feeling, so I have produced statistics to see the actual position.

My database extracted from Persondata

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I have a personal database of every article that holds a Persondata template, currently 1153424 records. For easier handling, each record is randomly allocated to one of 255 blocks. I have randomly chosen block 177 for my analysis, which contains 4548 records.

The current status of this block is

1226 Complete living  Complete = full date of birth
514 Complete non-living  and full date of death
204 Validated  All checks pass, but accurate birth/death dates are not known
2604 Various errors 

Apart from extracting the birth and death dates, my software does various validations, such as categories not agreeing with the data. 2604 seems a high percentage, but the majority of these are minor such as no place of death but not in the missing place of death category. Note, dates that are just a year are counted as not known.

Comparison of Persondata and Wikidata

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I took all the articles in block 177, and looked up birth/death dates on Wikidata.

96 Birth dates do not match between databases
141 Birth date only on Persondata
187 Birth date only on Wikidata
* 424 in error (somewhere)
40 Death dates do not match between databases
47 Death date only on Persondata
125 Death date only on Wikidata
* 212 in error (somewhere)

Out of the 4548 records analysed,

3140 records have a full date of birth in Persondata, Wikidata or both
1344 records have a full date of death in Persondata, Wikidata or both

The conclusion is that where a birth/death date is known, 13% of births and 15% of deaths show a discrepancy between the two databases.

The full list of discrepancies are listed below. My plan is to correct these and make a note where the fault lies. This should give an indication of work required to make Wikidata reliable.

Results

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I manually check the article to see why there is a difference and make a comment. The correct column shows which database was correct, P = Persondata, D = Wikidata, ? = unknown due to conflicting information.

Mismatched birth dates between Persondata and Wikidata

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Wikipedia article Persondata d.o.b. Wikidata d.o.b. Correct Comment
Paul Martin (baseball) 1932-03-09 1932-03-10 P Wikipedia edited 22 June 2013‎ with comment according to Baseball Reference, Retrosheet
Laine MacNeil 1996-10-28 1997-11-21 P Wikipedia edited 6 September 2013, referring to a tweet made by the actress
Charmaine Brooks 1971-02-07 1970-02-07 D Persondata out of sync with article following edit by IP on 4 June 2012
Adhemar (footballer) 1972-04-27 1972-04-22 ? Date varies between interwikis
Nikolai Stoletov 1834-11-13 1831-11-14 ? Wikidata sourced from Russian Wikipedia, which shows a different data to enwiki.
Marietta Alboni 1823-03-06 1826-03-06 ? Sources show different birth years.
Ricardo Ernesto Ahlf 1986-12-23 1986-10-23 ? Article has 2 different date of birth since its creation
Andy Smailes 1986-05-21 1896-05-21 D Mistype in Persondata
Sergei Winogradsky 1856-09-01 1856-09-13 ? Russian wikipedia has a different date than enwiki
Delphine von Schauroth 1814-03-13 1813-03-13 D Mistype in Persondata
Petr Kouba 1969-01-28 1969-11-28 ? Article has two different dates
Jannie van Eyck-Vos 1944-06-21 1936-01-19 D Wrong date in Persondata
Reinaldo Ventura 1978-05-16 1978-05-26 D Wrong date in Persondata
Amy Tuck 1963-07-09 1963-07-08 D Persondata not synced with article
Ahmed bin Saeed Al Maktoum 1958-12-22 1958-11-03 ? dewiki disagrees with enwiki
Robert Morris (financier) 1734-01-20 1734-01-31 P Infobox correction not corrected on Wikidata
Pascual Pérez (boxer) 1926-03-04 1926-05-04 D Incorrect figure in Persondata
Georges de la Nézière 1878-07-18 1878-07-31 ? Date varies between wikis
Aleksandr Lopukhin 1852-10-10 1852-10-22 P Wikidata appears to have used Russian calendar but called it Gregorian
Adam Gontier 1978-05-25 1978-05-21 D Persondata out of sync with article
Friedrich Hitzig 1811-11-08 1811-04-08 ? Wikidata has used a date from LCCN, which does not match date in article.
Baptiste Giabiconi 1989-12-09 1989-11-09 D Persondata out of sync with article
Ismaila Lassissi 1969-09-11 1985-02-16 P Incorrect date in infobox
Igor Cavalera 1970-09-04 1970-09-24 P Birth date on enwiki edited 4 September 2013 - other wikis show this date.
Tony Beckley 1927-10-07 1929-10-07 D Persondata not synced with article
Starling Marte 1988-10-10 1988-10-09 D Persondata not synced with article
Ms. Triniti 1974-03-06 1978-03-06 D Vandalism? on Persondata
Pierre Guérin de Tencin 1679-08-22 1680-08-22 ? Different years from different sources.
Heinrich Riso 1883-05-18 1882-06-30 D Persondata out of sync with article
Paul Bogart 1919-11-13 1919-11-21 D Persondata out of sync with article
Gianfranco Baraldi 1935-09-29 1935-08-26 ? Two dates in article
Lar Foley 1938-11-04 1938-11-23 D Persondata out of sync with article
Pete Holohan 1959-07-25 1298-07-25 P Dodgy bot gave football player a medieval birth date!
Matthew Porterfield 1977-10-06 1977-10-07 ? dewiki different to enwiki
Sandy Mutch 1884-12-09 1884-08-13 P Wikipedia updated, Wikidata still shows old date.
Hector Tiberghien 1888-02-19 1890-02-18 ? Dates differ between wikis
Sudha Shivpuri 1938-07-14 1937-07-14 D Persondata out of sync with article
William Patrick Fyfe 1955-02-27 1955-02-22 ? Two different dates in article
Arthur Mignault 1866-09-29 1865-09-29 D Persondata out of sync with article
Paolo Frascatore 1992-02-04 1992-01-04 D Persondata out of sync with article
Michael Halika 1978-10-11 1978-11-11 D Persondata out of sync with article
Omar Ali Juma 1941-06-26 1941-06-21 P Can not find where wikidata got date from
Gerald Phiri 1988-06-10 1988-10-06 D ydm format incorrectly used on Persondata
Rudolf Potsch 1937-05-15 1937-06-15 P Correction to date did not reach wikidata
Oleg Artemyev 1971-12-28 1970-12-28 D Persondata not synced with article
Countess Louise Henriette of Nassau 1627-12-07 1627-11-27 ? Conflicting dates in article
Sharad Yadav 1947-07-01 1947-10-01 P No idea where wikidata date came from, except that I have seen a few strange entries by GPUBot.
Yaseen Al-Bakhit 1989-03-24 1988-01-01 P Date was vandalised a few months ago.
Pacita Abad 1946-10-05 1946-09-05 P Article updated, did not reach wikidata
Ayoub Skouma 1987-03-22 1988-07-09 ? Multiple dates
Jules Jamin 1818-05-31 1818-05-30 ? enwiki different to ruwiki
Marco Pérez (Liechtenstein footballer) 1978-03-21 1976-04-21 P revised date not on wikidata
René-Pierre Quentin 1943-08-05 1943-07-05 ? itwiki is different to enwiki
Don Wildman 1961-03-27 1961-03-21 ? Two dates in article
Laban Coblentz 1961-07-21 1960-07-21 P GPUbot again seems to have added an incorrect year?
Georgi Todorov (weightlifter) 1951-12-04 1952-12-04 ? Different years on different wikis
Jan Rokita 1959-06-18 1959-07-18 ? Two dates on Wikidates (I had not allowed for this)
Lucrezia Bori 1887-12-24 1887-02-24 ? Two dates on Wikidata
June Hutton 1919-08-11 1920-08-11 ? enwiki updated with new information, other wikis not updated.
Pom (comics) 1919-11-16 1919-11-06 P Looks like a mistype into wikidata
Henry Koning 1960-06-20 1960-06-29 D Persondata out of sync
Dennis Flores 1993-09-18 1993-09-23 D Persondata out of sync
Àngel Rangel 1982-10-28 1982-11-28 P Month updated in January 2014, not updated in wikidata
Facundo Crovo 1975-12-11 1987-12-11 D Persondata out of sync
Fady Maalouf 1979-04-20 1976-04-20 ? Integrated Authority File has different year to Wikipedia
Frank Pietrangelo 1964-12-17 1965-12-17 ? Italian and English Wikipedias have differing dates
Camille Mana 1986-09-01 1983-09-01 ? Wikipedia article keeps changing dates, but no reliable reference given
Andrea Beltratti 1959-02-19 1959-02-09 D Persondata out of sync
Matt Freeman 1966-04-23 1966-06-14 ? Edit warring with a "Personal friend"
Theodor Krancke 1893-03-30 1893-03-20 ? Two dates on Wikidata
Antal Nagy (footballer born 1956) 1957-10-17 1956-10-17 D Persondata out of sync
Leon Jakimič 1975-02-23 1975-05-23 P Czech Wikipedia had been updated, not wikidata
Alexander Valeryevich Dyukov 1967-12-03 1967-12-13 ? Russian Wikipedia different to English
Paul Whitehouse 1958-05-20 1958-05-17 D Persondata out of sync with article
Ernst G. Straus 1922-02-25 1922-02-15 ? Integrated Authority File has a different date to Wikipedia
Saigon (rapper) 1977-07-13 1977-06-01 P Wikipedia updated, not wikidata
Heine Totland 1970-06-19 1970-10-16 D Persondata out of sync
Karl-Adolf Hollidt 1891-04-25 1891-04-28 ? Two dates in article
Robert Jeangerard 1933-06-20 1932-06-20 P Date of birth correct enwiki, not wikidata
Dominick Cruz 1985-03-09 1985-09-03 D Persondata had incorrect date
Jon Secada 1961-10-04 1962-10-04 D Persondata out of sync
Kristy Wu 1982-10-12 1982-10-11 D Persondata out of sync
Katherine of England 1523-11-25 1253-11-25 D Persondata out of sync
Jonny Magallón 1981-11-21 1981-10-21 ? Russian and English wikipedia showing different dates
Lekain 1728-04-14 1729-03-31 ? Wikidata has multiple dates
Alec Blakeman 1918-06-11 1936-04-01 ? Conflicting dates in Wikipedia article
Fikret Orman 1967-01-01 1967-11-04 D Article was using 1st January as a default
Thanasis Kolitsidakis 1966-11-20 1966-11-21 D Persondata was out of sync
Jennifer Hanson 1976-08-10 1973-08-10 D Wikipedia was updated to 1976 by a user called jenniferhanson, but the source shows 1973
Rhea Chakraborty 1992-07-01 1988-07-01 P Again GPUBot picked up incorrect year which I cannot find in history
Aleksei Maklakov 1962-01-06 1961-01-06 ? Russian Wikipedia disagrees with English version
Karl Davydov 1838-03-03 1838-03-17 D Persondata not using Gregorian date and no qualifiers
Edward B. Teague III 1949-11-25 1949-11-15 ? Different dates in article
Cindy Rondón 1988-11-12 1987-11-12 ? Date varies between English and other language Wikis
José Andreu García 1937-09-18 1924-09-18 ? Different dates in article
George Raynor 1907-01-13 1907-07-13 P Another wikidata insert with an incorrect date

Mismatched death dates between Persondata and Wikidata

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Wikipedia article Persondata d.o.d. Wikidata d.o.d.
Carl Friedberg 1955-09-09 1955-09-08
Leopold Lichtenberg 1935-05-16 1935-05-17
Ann Richards 2006-09-13 2006-09-14
Hawa Yakubu 2007-03-19 2007-03-20
Joe Stecher 1974-04-29 1974-03-29
Mohammad Mohammadullah 1999-11-11 1999-11-12
Sergei Winogradsky 1953-02-25 1953-02-24
William Giffard 1129-01-25 1129-01-23
Joseph Sterling Bridwell 1966-05-09 1966-05-08
Susenyos I 1632-09-07 1632-09-17
Robert Morris (financier) 1806-05-08 1806-05-09
Vladimir Rebikov 1920-10-01 1920-08-04
Einar Gerhardsen 1987-11-19 1987-09-19
Jean-Joseph Mouret 1738-12-22 1738-12-20
Photius, Metropolitan of Moscow 1431-02-07 1431-07-02
Georg von Metaxa 1944-12-12 1945-04-12
Lar Foley 2003-03-04 2003-05-04
Conrad I, Duke of Merania 1159-02-18 1159-02-08
Hector Tiberghien 1951-08-17 1951-08-16
John I. Cox 1946-09-05 1946-09-04
Howard Purcell 1981-04-01 1981-04-24
Kaúlza de Arriaga 2004-02-02 2004-02-03
Antoine François, comte de Fourcroy 1809-12-17 1809-12-16
Magdalena Sibylla of Neidschutz 1694-04-14 1694-04-04
Pierre Naville 1993-04-24 1993-03-24
Nino Pirrotta 1998-01-20 1998-01-22
Sybil Plumlee 2012-01-06 1911-04-29
Tomás Regalado (Salvadoran politician) 1906-07-07 1906-07-11
Jovan Grković-Gapon 1912-10-08 1912-10-09
Emil Schlagintweit 1904-10-29 1904-10-20
Henry Havelock 1857-11-29 1857-11-24
Hugo Blaschke 1959-12-06 1960-09-15
Shlomo Carlebach (musician) 1994-10-21 1994-10-20
Besik Kudukhov 2013-12-28 2013-12-29
Adhemar Schwitzguébel 1895-07-23 1895-01-23
Katherine of England 1527-05-03 1257-05-03
Gusty Spence 2011-09-24 2011-09-25
Karl Davydov 1889-02-14 1889-02-25
Gottlieb von Jagow 1935-01-01 1935-01-11
Anouar Abdel-Malek 2012-06-15 2012-06-17

Birth dates only on Persondata

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Wikipedia article Persondata d.o.b. Correct Comment
Michel Tremblay (politician) 1933-03-28 P Not copied across
Wharton Barker 1846-05-01 P Not copied across
Kenneth Weishuhn 1997-05-27 P Not copied across
Patricia Verne Kailis 1933-08-19 P Not copied across
Zara Northover 1984-03-06 P Not copied across
Yang Dong-hyun 1986-03-28 P Not copied across
Percival Barnett 1889-10-08 P Not copied across
Poul Erik Petersen 1927-05-07 P Not copied across
John Wesley Fitzgerald 1850-10-22 P Not copied across
Zhang Na (footballer) 1984-03-10 P Not copied across
William Lorenz 1882-02-15 P Not copied across
Floyd Curry 1925-08-11 P Not copied across
Paul Atkinson (guitarist) 1946-03-19 P Not copied across
William Johnston Almon 1816-01-27 P Not copied across
Numskull 1975-01-31 P Not copied across
Ambrose Flack 1902-03-16 P Not copied across
Hawa Yakubu 1948-03-24 P Not copied across
William R. Furlong 1881-05-26 P Not copied across
Murray Golden 1912-10-24 P Not copied across
Umetsugu Inoue 1923-05-31 P Not copied across
Ramesh Agarwal 1962-09-06 P Not copied across
Alexander Scoles 1844-11-30 P Not copied across
Álvaro Velasco (weightlifter) 1971-03-03 P Not copied across
Allen G. Debus 1926-08-16 P Wikidata only has year of birth
Saimir Tahiri 1979-10-30 P Not copied across
Harvey Picker 1915-12-08 P Not copied across
Örlygur Smári 1971-06-30 P Not copied across
Henri René 1906-12-29 P Not copied across
Charlton Monypenny 1867-11-04 P Not copied across
Arthur Tunstall 1922-02-22 P Not copied across
Fred White (footballer born 1916) 1916-12-05 P Not copied across
Percival Kinnear Wise 1885-04-17 P Not copied across
Prasad Sinha 1911-09-26 P Not copied across
Emjo Basshe 1898-01-20 P Not copied across
Theodore Sedgwick Fay 1807-02-10 P Not copied across
Władysław Siemaszko 1919-06-08 P Not copied across
Claude Cornish 1888-08-31 P Not copied across
Pascal Richard (skeleton racer) 1972-03-27 P Not copied across
Johannes Nolton 1888-10-27 P Not copied across
Harold Elverston 1866-12-26 P Not copied across
Nicolas Minorsky 1885-09-24 P Not copied across
Jørgen Blydt 1868-03-14 P Not copied across
Eileen Hendriks 1887-11-03 P Not copied across (was copied by bot in last few days)
Edmundo Prati 1889-04-17 P Not copied across
Yehuda Chitrik 1899-08-28 P Not copied across
Walter Spencer-Stanhope (1749–1822) 1749-02-04 P Not copied across
Henry Sweetser Burrage 1837-01-07 P Not copied across (was copied by bot in last few days)
Herbert Marcus 1878-09-06 P Wikidata only has year of birth
Yu Horiuchi 1990-12-23
Imran Hussain 1981-03-10
Ole Moe (editor) 1918-10-09
Walt Tauscher 1902-11-22
Paul Meyers 1895-11-19
William Sidebottom (RAF officer) 1893-10-11
Tom Crosskey 1905-07-04
William Matthews (poet) 1942-11-11
John Brigg 1834-09-21
George Hawking 1902-03-22
Henry Avory 1848-10-04
Wolfgang Kaden 1899-12-05
Alison Jackson 1970-05-15
Howard Purcell 1918-11-10
Brian Nissen 1927-10-20
Johan O. Jarnæs 1867-08-05
Arthur René Jean Baptiste Bavay 1840-04-29
Eduardo Schaerer 1873-12-02
William Roupell 1831-04-07
Ramon Collazo 1901-01-01
Norman Schofield 1944-01-30
Miguel Olivera 1946-07-05
Eiichi Goto 1931-01-26
William T. Shorey 1859-07-13
Vernon L. Walker 1894-05-02
Jürgen Harder 1918-06-13
Fitz James O'Brien 1828-12-31
Wilhelm Fulda 1909-05-21
Henry Hannon 1882-08-21
Roy Proebstel 1893-04-04
Jørgen Meinich 1820-03-24
Charles Henville Bayly 1807-03-13
William A. S. Ouderland 1917-12-06
Bernie McCarthy 1943-08-21
Sir Thomas Gascoigne, 8th Baronet 1745-03-07
Amritlal Hargovinddas 1889-08-29
Fred Grabber 1931-04-14
Lewis Teague (painter) 1917-11-30
Jules Bouquet 1888-11-30
Stuart Spencer (political consultant) 1927-02-20
Alessandra Ammara 1972-07-09
Edward Francis Ryan 1879-03-10
Duygu Asena 1946-04-19
Charles Wyndham, 3rd Baron Leconfield 1872-02-17
Matteo Agosta 1922-01-18
Yoon Won-il (born 1986) 1986-10-23
Henrik Morén 1887-01-05
Roger Ferris 1950-05-18
László Muskát 1903-01-26
Ernest S. Brown 1903-09-25
Lothar Friedrich von Metternich-Burscheid 1617-09-29
Jim Cook 1921-10-02
Ellis Ryan 1904-06-07
Heinrich Kaup 1912-07-25
Paul Hamilton (footballer born 1941) 1941-07-31
Johann Gustav Fischer 1819-03-01
William Worthington (actor) 1872-04-08
William George Hoskins 1908-05-22
Alfred Cheeke 1810-03-10
Ernest Jacquet 1886-09-25
William W. "Bill" Kirtley 1897-12-10
Zepherinus Joseph 1975-08-13
Robert J. Horner 1894-09-14
Amin Sweeney 1938-12-13
William Cadogan, 7th Earl Cadogan 1914-02-13
Augusto H. Álvarez 1914-12-24
Arthur Cotton (politician) 1913-01-23
Herbert Studd 1870-12-26
John P. Kirk 1867-09-20
Deborah Scaling Kiley 1958-01-21
Justus Falckner 1672-11-22
William Penman 1917-05-12
William Milnor 1769-06-26
Luis Hierro Gambardella 1915-09-01
Andreas Loverdos 1956-05-15
Roy Evans (disambiguation) 1913-11-10
Joseph Przybylski 1897-06-09
William Connell (Australian politician) 1891-01-21
Hilary Bardwell 1928-07-21
Mike Bongiorno 1924-05-26
Sharon Slann 1966-02-12
James Bowen (railroad executive) 1808-02-25
William Gallant 1915-01-20
Samuel A. Schreiner, Jr. 1921-06-06
Margaret of Bavaria, Electress Palatine 1456-11-07
Nalini Ambady 1959-03-20
Tom Kelly (footballer, born 1919) 1919-11-22
Bill Bartley 1885-01-08
Henri Sévérin Béland 1869-10-11
Asuman Güzelce 1969-04-01
Renato Ardovino 1968-11-29
Irving Harper 1916-07-14

Birth dates only on Wikidata

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Wikipedia article Wikidata d.o.b. Correct Comment
Dumitru Dragomir 1946-05-30 D Persondata not updated
Jack Kornfield 1945-07-16 D Persondata only had year, not full date
Jesper Larsen 1972-10-29 D Birth on dewiki, not on enwiki
Jeanne Demessieux 1921-02-14 D Persondata only contained year
Rajiv Mehrotra 1953-03-04 P Invalid date format in Persondata. Unreferenced and not mentioned in article.
Matthias de Visch 1701-03-22 D Russian Wiki has full date, enwiki only has year
Mitch Fatel 1975-12-20 X Persondata not synced with article. Wikidata also had incorrect year.
Norma Ray 1970-03-21 D Persondata only had year
Gurbani Judge (VJ Bani) 1987-11-29 ? Article birth date changes frequently!
Richard N. Gladstein 1961-06-04 D Date only on dewiki
H. Edward Winter 1908-10-14 D No date in Persondata
Martin Petrásek 1966-03-26 D Date only in cswiki
Bobby Green (fighter) 1986-09-09 D Only year in Persondata
Boyanka Kostova 1993-05-10 D enwiki only wiki not to have date
Kemp Malone 1889-03-14 D Date not added to Persondata
Corrado Pani 1936-03-04 D Date not added to Persondata
Ilisavani Jegesa 1988-11-22 D Date not added to Persondata
Edmond Genet 1896-11-09 D Birth date only on svwiki
Pedro Julio Sánchez 1940-04-08 D Birth data only on eswiki
Levko Lukyanenko 1928-08-24 D Persondata not updated
Jocy de Oliveira 1936-04-11
Wu Yi 1938-11-11
Vittorio Ranuzzi de' Bianchi 1857-07-14
Earle C. Hayes 1885-11-21
Herwin Novianto 1965-11-21
Anthony J. DePace 1892-07-13
Patriarch Christopher II of Alexandria 1876-01-17
Georges Rousse 1947-07-28
Francis Boggs Snavely 1897-04-19
Judit Kormos 1970-05-11
François Coignet 1814-02-11
Gabriela Lena Frank 1972-09-26
James Stevenson-Hamilton 1867-10-02
Lev Oborin 1907-08-28
Tom Bethell 1940-07-17
Frederick Pang 1936-11-16
Rohit Gadia 1984-08-27
Jim Gervais 1938-03-05
Iris Stuart 1903-02-02
Gaetano Previati 1852-08-31
Khalid Shahdan 1964-07-05
James Strachey 1887-09-26
Jeff Bell 1943-12-13
Robert Ramillon 1909-02-24
Vladimir Rebikov 1866-05-31
Anna Fantastic 1970-12-31
Ignatije Midić 1954-10-17
Cecil Wood (cricketer) 1875-11-21
Julius Exner 1825-11-30
Thomas Satinsky 1959-06-07
Charles L. Kane 1951-12-01
Le Grand Kallé 1930-12-16
Henri Tézenas du Montcel 1943-01-08
Gustav Altenhain 1891-12-05
OdiakeS 0000-03-22
Faisal of Saudi Arabia 1906-10-10
Mark Lidzbarski 1868-01-07
John Ashley (bandit) 1888-03-19
Guennady Moisseev 1948-02-03
Adolf Gasser 1903-11-25
Víctor Cancino 1972-06-27
Walter Walford Johnson 1904-04-16
Werner Pusch 1913-08-17
Olivier Weber 1958-06-12
Sukhabodhananda 1955-04-25
Tolib Shakhidi 1946-03-13
Kazuhiko Nishi 1956-02-10
Ludwig Kasper 1893-05-02
Frederick Keeton 1855-10-26
Herman Hupfeld 1894-02-01
Charles Fleming (cricketer) 1887-02-28
Diego Estrada (athlete) 1989-06-01
Erich Haase 1859-01-19
Harri Rovanperä 1966-04-08
Lilyana Tomova 1946-08-09
Michael Rudman 1939-02-14
Armigel Wade 1880-10-17
Joe Meyers 1871-12-05
Sebastián Longo 1983-05-27
Flemming Delfs 1951-09-07
Kanchi Kaul 1982-05-24
Bobby Voelker 1979-04-26
Scott Taylor (journalist) 1960-12-30
Guido Herzfeld 1851-08-14
Lloyd Woodard 1984-11-12
Mati Karmin 1959-02-26
Mark Cameron 1952-10-10
Curt Thesing 1879-04-21
Dan Quinn (American football) 1970-09-11
Fiona McIntosh 1960-03-14
Ramadan Shalah 1958-01-01
James Whitley (alpine skier) 1997-11-17
Joseph Joffo 1931-04-02
Ivan Vandor 1932-10-13
Gregorio Cortez 1875-06-22
Mirjam Kristensen 1978-05-17
Wolfgang Fortner 1907-10-12
Ernest M. Skinner 1866-01-15
Hansjörg Wyss 1935-09-19
Bob Hale (philosopher) 1945-05-04
Pavel Fitin 1907-12-28
G. Ramachandran 1931-05-23
Adolf Zeising 1810-09-24
Saikumar (Malayalam actor) 1963-04-14
Ingo Kindervater 1979-01-01
Cassius Fairchild 1829-12-16
Gustav Blix 1974-08-31
Yuji Shiozaki 1967-09-07
Sam Houser 1972-05-24
Helene Tursten 1954-02-17
Erik Hartvall 1875-02-18
Loane 1978-05-30
Frenc Tal-Gharb 1892-12-03
Aureliano Bolognesi 1930-11-15
Francisco Rolão Preto 1893-02-05
Veli Lehtelä 1935-09-06
Adolfo Marsillach 1928-01-25
Joseph P. Foley 1872-03-02
Andrea Maffei 1798-04-19
Vladimir Litvinenko 1955-08-14
Mushegh Sarvarian 1910-02-15
Mircea Albulescu 1934-10-04
Carlo Airoldi 1869-09-21
Kenn (Japanese actor) 1982-03-24
Sneha Khanwalkar 1983-04-28
Andy Kim 1946-12-05
Dong Huling 1992-11-29
Sam Instone 1977-08-03
Malte Spitz 1984-04-14
Andrey Borovykh 1921-10-30
Mykola Katerynchuk 1967-11-19
Carl Grunert 1865-11-02
Brenda Miller Cooper 1916-02-28
Bruce Russett 1935-01-26
Tina Blau 1845-11-15
Isaak Sigal 1927-03-31
Angus MacDonald (politician) 1963-10-11
Ralph Nuzzo 1954-02-23
Bernhard Gál 1971-11-19
Andrei Knyazev (mathematician) 1959-06-09
Joseph Mayer (antiquary) 1803-02-23
Raymund Schwager 1935-11-11
Ruth Lomon 1930-11-07
Anthony John Cooke 1931-01-29
Devon Morris 1961-01-22
Chris D. 1952-01-15
William Falconer (translator) 1801-12-27
Hugo Reid 1811-04-18
Senkichi Awaya 1893-11-07
Leo Aloysius Pursley 1902-03-12
Fausto Torrefranca 1883-02-01
John Henry Anderson 1814-07-14
Chase Wright Vanek 1996-06-27
Adhemar Schwitzguébel 1844-01-15
Marshall James 1970-10-04
Augustinus Bludau 1862-03-06
Sandy Salmon 1955-10-23
J. Greg Peters 1960-11-15
Madeline Hartog-Bel 1946-06-12
Nikolay Kasatkin 1859-12-25
John McClung 1935-07-15
Carlos de Borja y Centellas 1663-04-29
Daýançgylyç Urazow 1978-12-15
Alma Kruger 1871-09-13
Jean-Pierre Sauvage 1944-10-21
Giuseppe Cominetti 1882-10-28
Eugene Herbert Clay 1881-10-03
Leendert Pieter de Neufville 1729-03-08
Yitzhak Gruenbaum 1879-10-27
Harry Söderman 1902-08-28
Takamura Kōun 1852-03-08
Eric Stokes (composer) 1930-07-14
Markus Toivonen 1979-11-15
Savva Mamontov 1841-10-15
Mara Venier 1950-10-20
Robert M. Nevin 1850-05-05
Abbé Pierre 1912-08-05
Stanisław Rogalski 1904-05-25
Todd Robert Petersen 1969-08-17
Jacques Toja 1929-09-01
Collingwood Ingram 1880-10-28
Heinrich Dorn 1804-11-14
David Hofstein 1889-08-06
Theodore Ushev 1968-02-04
Taylor Welch 1989-11-01

Death dates only on Persondata

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Wikipedia article Persondata d.o.d.
John Wesley Fitzgerald 1908-02-03
Arthur Jolley 1993-04-24
Ambrose Flack 1980-04-01
Alexander Scoles 1920-12-29
AllahDad Bohyo 1994-07-16
Theodore Sedgwick Fay 1898-11-17
Harold Elverston 1941-08-10
Edmundo Prati 1970-11-24
Henry Sweetser Burrage 1926-03-09
Herbert Marcus 1950-12-11
Venerando Pulizzi 1852-10-08
Peter Kelly (GAA) 1908-04-07
Tom Crosskey 1971-03-25
Victor Paranjoti 1967-02-01
John Brigg 1911-09-30
Henry Avory 1918-04-16
Adolph von Pfretzschner 1901-04-27
Eduardo Schaerer 1941-11-12
Karigaila 1390-09-16
Eiichi Goto 2005-06-12
Henry Hannon 1958-12-10
Roy Proebstel 1963-03-03
Charles Henville Bayly 1873-01-25
Gary Chapman (author, educator, and activist) 2010-12-14
Sir Thomas Gascoigne, 8th Baronet 1810-02-11
Sir Arthur Brooke, 2nd Baronet 1854-11-21
Amritlal Hargovinddas 1964-12-12
Fred Grabber 2013-05-19
Lewis Teague (painter) 1978-04-14
Herbert Fortier 1949-02-16
Charles Wyndham, 3rd Baron Leconfield 1952-04-17
Matteo Agosta 1964-05-18
Josephine Schefsky 1912-11-11
Johann Gustav Fischer 1889-01-27
Alfred Cheeke 1876-03-14
Ernest Jacquet 1969-09-30
William W. "Bill" Kirtley 1944-09-23
Amin Sweeney 2010-11-13
Arthur Cotton (politician) 1920-12-06
John P. Kirk 1952-08-22
Deborah Scaling Kiley 2012-08-13
William Connell (Australian politician) 1945-04-14
Ambrose Kyte 1868-11-16
Hilary Bardwell 2010-06-24
William Hutchinson (superintendent) 1846-07-26
James Bowen (railroad executive) 1886-09-29
Robert Richard Randall 1801-06-05
Ioannes Henricus Meibomius 1700-03-26

Death dates only on Wikidata

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Wikipedia article Wikidata d.o.d.
Jeanne Demessieux 1968-11-11
Thomas Chilcot 1766-11-24
Ladislaus of Salzburg 1270-04-27
H. Edward Winter 1976-07-22
Pope Innocent VI 1362-09-20
Kemp Malone 1971-10-13
Jamshīd al-Kāshī 1429-06-22
Corrado Pani 2005-03-02
Edmond Genet 1917-04-17
Vittorio Ranuzzi de' Bianchi 1927-02-16
Jean LeClerc (painter) 1633-10-20
Margaret Benson 1916-05-13
Patriarch Christopher II of Alexandria 1967-07-23
Curt Siodmak 2000-09-02
Francis Boggs Snavely 1979-10-29
Henri Ellenberger 1993-05-01
François Coignet 1888-10-30
David Isaacs (singer) 2009-12-21
James Stevenson-Hamilton 1957-12-10
Lev Oborin 1974-01-05
Gaetano Previati 1920-06-21
James Strachey 1967-04-25
Aleksandr Lopukhin 1904-09-04
François Dufrene 1982-12-12
Cecil Wood (cricketer) 1960-06-05
Julius Exner 1910-11-15
Le Grand Kallé 1983-02-11
Henri Tézenas du Montcel 1994-12-02
Gustav Altenhain 1968-12-23
Thomas Savin 1889-07-23
Brian O'Rourke 1591-11-03
Mark Lidzbarski 1928-11-13
Adolf Gasser 1985-07-15
Walter Walford Johnson 1987-03-23
Werner Pusch 1988-09-16
Dominic Burke (bishop) 1704-01-01
George X of Kartli 1606-09-07
Ludwig Kasper 1945-08-28
Wifred II, Count of Barcelona 0911-04-26
Frederick Keeton 1911-11-27
Herman Hupfeld 1951-06-08
Charles Fleming (cricketer) 1918-09-22
William Campbell (NY surveyor) 1844-10-27
Erich Haase 1894-04-24
Charles Nicholson (flautist) 1837-03-26
L.W.C van den Berg 1927-03-02
Robert Guibé 1513-11-09
Sheng Shicai 1970-07-13
John B. Forester 1845-08-31
Paritala Ravindra 2005-01-24
Lamoral, Count of Egmont 1568-06-05
Michael Rudy Tham 1998-10-05
William Vaux, 3rd Baron Vaux of Harrowden 1595-08-20
Guido Herzfeld 1923-11-16
John "Pondoro" Taylor 1969-10-18
Curt Thesing 1956-05-25
Gregorio Cortez 1916-02-28
Wolfgang Fortner 1987-09-05
Ernest M. Skinner 1960-11-25
Adolf Zeising 1876-04-27
William VII of Chalon 1475-10-27
Cassius Fairchild 1868-10-24
Conrad (Bishop of Utrecht) 1099-04-13
Guillermo Buitrago 1949-04-19
Amico Agnifili 1476-11-09
José Cândido de Carvalho 1989-08-01
Frenc Tal-Gharb 1967-05-19
Francisco Rolão Preto 1977-12-18
Joseph P. Foley 1928-05-11
Alexander Schapiro 1946-12-05
Alfred Nähring 1991-02-15
Andrea Maffei 1885-11-27
Hilliard Beyerstein 1990-09-23
Carlo Airoldi 1929-06-18
Georg von Blumenthal 1550-10-05
Enzo Petito 1967-07-17
Michihiko Hachiya 1980-04-13
Andrey Borovykh 1989-11-07
Mieszko I, Duke of Cieszyn 1315-08-27
Malisa Zini 1985-02-26
Brenda Miller Cooper 2008-04-03
Tina Blau 1916-10-31
Kenneth Cecil Bunch 1942-06-06
Joseph Mayer (antiquary) 1886-01-19
Raymund Schwager 2004-02-27
Ruth Hurmence Green 1981-07-07
Leon Abbey 1975-09-15
William Falconer (translator) 1885-02-09
Senkichi Awaya 1945-08-06
Leo Aloysius Pursley 1998-11-15
Bungo Tsuda 2007-11-08
Fausto Torrefranca 1955-11-26
John Henry Anderson 1874-02-05
Dawson Charlie 1908-12-26
Joseph-Marie Lo Duca 2004-08-06
António Carneiro 1930-03-31
John McClung 2004-10-21
Carlos de Borja y Centellas 1733-08-08
Giuseppe Cominetti 1930-04-21
Eugene Herbert Clay 1923-06-22
Leendert Pieter de Neufville 1797-09-19
Yitzhak Gruenbaum 1970-09-07
Harry Söderman 1956-03-16
Takamura Kōun 1934-10-10
Guthlac of Crowland 0714-04-11
Emil Trinkler 1931-04-19
Frederick I, Duke of Lorraine 1207-04-07
Raphael Falk 1913-04-27
Lauder William Jones 1960-12-28
Savva Mamontov 1918-04-06
João Afonso de Albuquerque 1354-09-28
Robert M. Nevin 1912-12-17
Abbé Pierre 2007-01-22
Stanisław Rogalski 1976-02-06
Abraham op den Graeff 1731-03-25
George Hackwill 1919-04-15
Louis Aleman 1450-09-16
Jacques Toja 1996-03-23
Collingwood Ingram 1981-05-19
Heinrich Dorn 1892-01-10
Juniper (friar) 1258-01-29
Édouard Lockroy 1913-11-22

Conclusion

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My main conclusion is that as far as birth/death date completeness and accuracy goes, there is no significant difference between Wikidata and Persondata. If you want to find a date, both offer a 90% chance of it being available and accurate. I personally have made the decision to switch to utilising Wikidata as I believe it has the potential to improve, whereas Persondata keeps being threatened!

Faults with the Wikidata database

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On the assumption I will be working with Wikidata from this point on, I will list the problems that currently exist and that I hope to be helping to address.

  • Wikipedia is the main source for Wikidata, but nothing seems to be in place to keep Wikidata synchronised
    • There are Wikipedia articles with birth/death dates that have not yet been added to Wikidata
    • There are Wikipedia articles with revised birth/death dates which are not being updated on Wikidata
    • Articles that are deleted on Wikipedia (i.e. not-notable) leave behind an entry on Wikidata
  • Wikipedia articles have problems that are not flagged. Wikidata picks up a date that is not necessarily correct
    • Some Wikipedia articles have conflicting dates within the article
    • Some Wikipedia articles have different dates between different language wikipedias
    • Julian and Soviet calendars are not always been handled correctly
  • Birth dates are rarely referenced on Wikipedia. This makes it impossible to correct any conflicting information. I raised this at WikiProject Biography but did not get much feedback.