Tom: The suggestion of making the numeric attribute real as opposed to integer seems to me a pragmatic approach.
Cheers Mark Mark S Leaning PhD From: [email protected] [mailto:openehr-clinical-bounces at chime.ucl.ac.uk] On Behalf Of Thomas Beale Sent: 22 April 2010 18:45 To: openehr-clinical at openehr.org Subject: Re: ??? DV_CODEDQUANTITY 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_110959933787 7_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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openehr.org/mailman/private/openehr-clinical_lists.openehr.org/attachments/20100426/b8b4cd44/attachment.html>
