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Re: dwbp-ISSUE-222: Multiple/Derived values of a metric [Quality & Granularity Vocabulary]

From: Annette Greiner <amgreiner@lbl.gov>
Date: Mon, 7 Dec 2015 10:15:36 -0800
Message-Id: <9F15FFE0-9384-4059-8A78-9A34E755738B@lbl.gov>
To: Data on the Web Best Practices Working Group <public-dwbp-wg@w3.org>
It looks to me from the spec[1] that there was a plan to add more statistics. I think we could add things like minima and maxima as separate statistics if they are deemed useful. I would like to see each named statistic remain comparable across instances of the same statistic, so variants like max and min would need their own names. 

I’d also like to suggest we include some statistics that are more directly related to quality than the examples, which seem text-centric. Percentage of empty values and percantage of nulls come to mind.
-Annette

[1] http://w3c.github.io/dwbp/vocab-dqg.html#statistics

> On Dec 6, 2015, at 8:28 AM, Data on the Web Best Practices Working Group Issue Tracker <sysbot+tracker@w3.org> wrote:
> 
> dwbp-ISSUE-222: Multiple/Derived values of a metric [Quality & Granularity Vocabulary]
> 
> http://www.w3.org/2013/dwbp/track/issues/222
> 
> Raised by: Antoine Isaac
> On product: Quality & Granularity Vocabulary
> 
> Raised in public comment by Werner Bailer
> https://lists.w3.org/Archives/Public/public-dwbp-comments/2015Oct/0019.html
> 
> [
> a. multiple values of one metric
> 
> We found that there are metrics where a single output value may not be sufficient. In particular, this applies to statistics (which are listed as one dimension in the draft spec). For example, one may want to express the mean, min or max of a metric over a dataset, or providing an absolute and a relative (normalized) value for the same metric. Of course this could be done by defining multiple metrics, but then one would need a mechanism to group/link them or express their dependency. 
> 
> In the EBU, the working group on quality control [2] has defined a data model for the somewhat related problem of describing quality of audiovisual content (with XML serialisations so far, not RDF). This model supports multiple output values, that can be typed. For DQV, this could for example be achieved by having multiple values, and defining subproperties of daq:value.
> 
> 
> [2] https://tech.ebu.ch/groups/qc
> ]
> 
> 
> 
Received on Monday, 7 December 2015 18:16:04 UTC

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