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    $\begingroup$ The practical distinction between ordinal and other scales is much fuzzier than many of the more doctrinaire treatments of measurement scales imply. If I and my colleagues grade (mark) academic work on a percent scale giving say 68 or 74 is assigning marks on what might be called an ordinal scale with 101 allowed integer levels, but we have criteria for marks and mechanisms for cross-checking each other's grades and at my workplace (and many others) averaging grades is the start of summarizing students' work. $\endgroup$ Commented Feb 20 at 8:24
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    $\begingroup$ It is routine that universities apply data analysis methods condemned in some of their own departments. $\endgroup$ Commented Feb 20 at 8:24
  • $\begingroup$ Indeed. Of course, marking on a "percent scale" is often not really a percent of any particular thing, depending on the format of the test. $\endgroup$ Commented Feb 20 at 12:25
  • $\begingroup$ Agreed. Some times 100 means "all correct" and sometimes it means as good as could be expected, except that it is not awarded often. Equally 0 doesn't usually meaning completely ignorant.... $\endgroup$ Commented Feb 20 at 13:46