The wiki one is interesting. Correspondences with openEHR (see
information model at
http://www.openehr.org/uml/release-1.0.1/Browsable/_9_0_76d0249_1109599337877_94556_1510Report.html):
* nominal 'scale' - this is not really a scale, but a classification
concept, expressed using DV_CODED_TEXT
* ordinal scale - DV_ORDINAL
* interval scale - this is formalised by the abstract type
DV_ABSOLUTE_QUANTITY, whose only current subtypes are DV_DATE,
DV_DATE_TIME and DV_TIME. These types don't have + or - defined in
the normal way, although add and subtract operations (different
semantics do apply).
* ratio scale - this is formalised in the type DV_AMOUNT, which
models exactly the concept of quantities with a meaningful 0 point
and for which + and - operations are defined. Concrete subtypes
are DV_QUANTITY, DV_COUNT, DV_DURATION and DV_PROPORTION.
this article doesn't seem to mention non integer 'ordinals' though...
- thomas
On 22/04/2010 10:13, Mark Leaning wrote:
> This Wikipedia article is not bad:
> http://en.wikipedia.org/wiki/Level_of_measurement
>
*
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