daniel created this task.
daniel added subscribers: Wolfvoll, Klortho, MSGJ, Kelson, Ricordisamoa,
Wikidata-bugs, Bene, He7d3r, Denny, Micru, mgrabovsky, Ash_Crow, Event, Snipre,
Liuxinyu970226, Lydia_Pintscher, Stryn, daniel.
daniel added projects: Epic, Wikidata, Tracking,
MediaWiki-extensions-WikibaseRepository.
Herald added a subscriber: Aklapper.
TASK DESCRIPTION
We currently assume an uncertainty interval of +/-1 or the least significant
digit of a given quantity:
10.2 => 10.2 +/- 0.1 => interval [ 10.1, 10.3 ] => uncertainty
magnitude 0.2
13e3 => 13e3 +/- 1e3 => interval [ 12e3, 14e3 ] => uncertainty magnitude
2e3
This means the //magnitude// of the uncertainty interval is //twice// the
magnitude of the least significant digit. It seems more intuitive to assume the
size of the interval to be one order of magnitude:
10.2 => 10.2 +/- 0.05 => interval [ 10.15, 10.25 ] => uncertainty
magnitude 0.1
13e3 => 13e3 +/- 0.5e3 => interval [ 12.5e3, 13.5e3 ] => uncertainty
magnitude 1e3
This is also supported by the Wikipedia article on the quantification of
accuracy and precision:
https://en.wikipedia.org/wiki/Accuracy_and_precision#Quantification
Perhaps the current implementation came about due to confusion about the
magnitude of the uncertainty, and the +/- notation.
TASK DETAIL
https://phabricator.wikimedia.org/T105623
EMAIL PREFERENCES
https://phabricator.wikimedia.org/settings/panel/emailpreferences/
To: daniel
Cc: daniel, Stryn, Lydia_Pintscher, Liuxinyu970226, Snipre, Event, Ash_Crow,
mgrabovsky, Micru, Denny, He7d3r, Bene, Wikidata-bugs, Ricordisamoa, Kelson,
MSGJ, Klortho, Wolfvoll, Aklapper, aude, Malyacko, P.Copp
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