Dear Everyone, here is a nice 1946 paper on this:
http://web.duke.edu/philosophy/bio/Papers/Stevens_Measurement.pdf /Daniel Thomas Beale skrev: > 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 >> >> >> > * > > * -------------- next part -------------- A non-text attachment was scrubbed... Name: Daniel_Karlsson.vcf Type: text/x-vcard Size: 387 bytes Desc: not available URL: <http://lists.openehr.org/mailman/private/openehr-clinical_lists.openehr.org/attachments/20100425/2f3af238/attachment.vcf>
