[Wikidata-bugs] [Maniphest] [Changed Subscribers] T68580: Better support for exact values in Quantity DataType

2015-08-31 Thread Jc3s5h 
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[Wikidata-bugs] [Maniphest] [Changed Subscribers] T68580: Better support for exact values in Quantity DataType

2015-10-15 Thread Tobias1984 
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[Wikidata-bugs] [Maniphest] [Changed Subscribers] T68580: Better support for exact values in Quantity DataType

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[Wikidata-bugs] [Maniphest] [Changed Subscribers] T68580: Better support for exact values in Quantity DataType

2015-10-30 Thread mgrabovsky 
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[Wikidata-bugs] [Maniphest] [Changed Subscribers] T68580: Better support for exact values in Quantity DataType

2015-12-31 Thread ResMar 
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[Wikidata-bugs] [Maniphest] [Changed Subscribers] T68580: Better support for exact values in Quantity DataType

2015-05-04 Thread Bugreporter 
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[Wikidata-bugs] [Maniphest] [Changed Subscribers] T68580: Better support for exact values in Quantity DataType

2015-05-04 Thread Ayack 
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[Wikidata-bugs] [Maniphest] [Changed Subscribers] T68580: Better support for exact values in Quantity DataType

2015-05-04 Thread Gareth 
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[Wikidata-bugs] [Maniphest] [Changed Subscribers] T68580: Better support for exact values in Quantity DataType

2015-07-08 Thread AmaryllisGardener 
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[Wikidata-bugs] [Maniphest] [Changed Subscribers] T68580: Better support for exact values in Quantity DataType

2015-07-08 Thread Sjoerddebruin 
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[Wikidata-bugs] [Maniphest] [Changed Subscribers] T68580: Better support for exact values in Quantity DataType

2015-07-08 Thread Mbch331 
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[Wikidata-bugs] [Maniphest] [Changed Subscribers] T68580: Better support for exact values in Quantity DataType

2015-07-10 Thread Stryn 
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[Wikidata-bugs] [Maniphest] [Changed Subscribers] T68580: Better support for exact values in Quantity DataType

2015-07-12 Thread daniel 
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daniel added a comment.

In https://phabricator.wikimedia.org/T68580#1447920, @kaldari wrote:

> @daniel: Wikipedia manages to do sensible automatic unit conversion without 
> specifying uncertainty (probably by looking at the number of digits), so why 
> can't Wikidata?


No it doesn't - have a look at https://en.wikipedia.org/wiki/Template:Convert
It uses a sensible default, but in many cases, you actually have to specify the 
precision explicitly.

> I realize that setting the default uncertainty to 0 is wrong for 
> measurements, but couldn't null be the default, and the conversion script 
> switch to using number of digits in the case of null uncertainty?


That's pretty much what we do: if no uncertainty is specified, we look at the 
number of digits to determine it.
We could also do this upon conversion, but then we'd need to store an extra 
flag for "auto precision" - using 0 for this would make it impossible to force 
absolute exactness in the cases it is required (these are rare but important - 
one use case is the definition of units in relation to other units, see 
Significance_arithmetic 
).

> Also, I believe the implied uncertainty of whole number measurements is 
> +/-0.5, not +/-1.


That was also my intuition, but @Denny convinced me that this was wrong. 
Reading up on this now, Accuracy_and_precision#Quantification 
 seems to 
support your (and my) intuition. The only thing I could quickly find in support 
of Denny's version is Significant_figures#Estimating_tenths 
, but it 
doesn't really seem to apply.


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[Wikidata-bugs] [Maniphest] [Changed Subscribers] T68580: Better support for exact values in Quantity DataType

2015-02-14 Thread DSGalaktos 
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