To evaluate the completeness of items, there are currently several lists at Wikidata:
- a. [[ https://www.wikidata.org/wiki/Wikidata:WikiProject_Movies/Numbers#Key_indicators | WikiProject_Movies/Numbers#Key_indicators ]]
- b. [[ https://www.wikidata.org/wiki/Wikidata:WikiProject_Movies/Numbers#Film_items_with_a_given_property | WikiProject_Movies/Numbers#Film_items_with_a_given_property ]]
- c. [[ https://www.wikidata.org/wiki/Wikidata:WikiProject_Virtual_Twins#Numbers | WikiProject_Virtual_Twins#Numbers ]] (percentage column and links to items missing them)
- d. [[ https://www.wikidata.org/wiki/Wikidata:Wikivoyage/Lists/Embassies | Wikidata:Wikivoyage/Lists/Embassies ]] ("completeness" column and definition)
- e. [[ https://www.wikidata.org/wiki/Wikidata:WikiProject_Q5/lists/riders_and_their_horse | lists: riders and their horse]] ("completeness" column and definition)
Measuring could be done:
- 1. compared to properties present on other items in the same result. @Magnus 's tool [[https://tools.wmflabs.org/wikidata-todo/related_properties.php | "Related Properties"]] used to work well for that. See samples b. and c. above.
- 2. compared to a theoretical list included in the query. See samples a., d., and e. above.
- 3. compared to a theoretical list defined in [[ https://www.wikidata.org/wiki/Property:P1963 | properties for this type (P1963) ]]. Given that the property isn't used much, this might correspond to #1 or #2
- 4. compared to the percentage of uses in a larger set (e.g. items for politicians compared to items for people in general) or a comparable set (e.g. US senators compared to US presidents).
- 5. (maybe) compared to some completeness marker
- 6. etc . [ please add more ]
Ideally this would go beyond an empty / non empty cell in a table, but not be based on a 1-by-1 manual evaluation of completeness of items. T145531, T127475 cover other aspects.