User:DexDor/Finding miscategorizations

This page contains links to a category intersection tool (Petscan) to check whether there are pages at some combinations of namespace and high level categories. For a table showing which combinations of namespace and category are valid see User:DexDor/NSCat. For more information about how pages become miscategorized and how to fix them see User:DexDor/FHL.

The table shown below (in which the rows roughly correspond to the columns of the NSCat table) includes links to a category intersection tool that can identify any pages at certain combinations of namespace and category.

Category/ies	Namespace(s)	Query	Notes
CA	User	PetScan	This tends to find a lot of sandbox subpages that have been (prematurely) placed in article categories. It also finds user pages that are violations of WP:USERNOCAT (example fix) and user books that are categorized as community books. If the query could be restricted to only find non-subpages or to only find pages that have not been edited for a period (e.g. a week) it would be easier to identify pages that are priority to fix.
	Talk (most) Wikipedia Help etc (not Template)	PetScan	Just a few (e.g. Wikipedia:WikiProject Spoken Wikipedia) as of August 2016. It's generally best to work on a subcategory of Category:Articles - e.g. Science, People.
	Template	Petscan	This query looks at a particular content (articles) category and excludes stub templates (Stub templates are in stub categories which are in article categories).
CA+CD	Mainspace User Wikipedia File MediaWiki Template Help Category Portal Book ... Talk	PetScan	As of August 2016 depth=4 has 326 pages (mostly in mainspace).
CB	User Almost every namespace (apart from Book, Category and Module Talk)	PetScan	As of September 2016 at depth=5 this has 16 pages in User namespace.
CD	Talk File Template ...	PetScan	As of 17/8/2016 at depth=7 has 8 pages (e.g. Template:Expand).
CDr redirects	Talk File Template ...	[?? PetScan]	As of September 2016 at depth=??? has ?? pages - Does not work (PetScan selects things that aren't redirects).
CE	Talk Lots (excluding User, Wikipedia, Help, Category)	PetScan	As of August 2016 at depth=7 has just two pages.
CF	Mainspace	PetScan	Note: (As of August 2016) Category:Articles containing image maps puts some articles under Category:Wikipedia files. (As of September 2016) a query that excludes that category (PetScan) at depth=3 has 18 files.
CH	File MediaWiki Portal Book Draft Ed Prog Most talk pages	PetScan
	Mainspace	x
	Template	x
	Talk User talk Wikipedia talk	x
CI	Mainspace MediaWiki Book Draft Ed.Prog. TimedText Talk ...	PetScan	As of September 2016 at depth=6 this has 288 pages (mostly in talk namespaces).
	Portal	x
CP (non-redirects)	Mainspace User Help Book +???	PetScan	As of March 2017 at depth=8 has 5 pages (e.g. sandboxes).
CP (redirects)	User MediaWiki Help Book Draft ...	PetScan	As of August 2016 at depth=7 has 3 pages (e.g. sandboxes).
CR+CD	Mainspace Other namespaces	PetScan	As of August 2016 at depth=7 has 15 pages.
CT	Mainspace Book?? Portal?? ...	PetScan	As of August 2016 at depth=3 has 619 pages (including pages in Category:Ill-formatted IPAc-cmn transclusions - to be fixed).
CU	Mainspace Talk (excluding user talk, Wikipedia Talk) Help Portal Book Ed. Prog.	PetScan	As of September 2016 at depth=8 this has 0 pages. Book:WikiFauna
	Wikipedia Talk +	PetScan	As of August 2016 at depth=7 this has 81 pages (e.g. via Category:Wikipedia Arbitration Committee archives).
CW	Book Portal Topic MediaWiki Ed. Prog. TimedText	PetScan	As of September 2016 at depth=4 this has 153 pages (all in portal namespace - typically because a portal page transcludes a wikiproject page).