On Tue, 27 Aug 2013 10:03:26 +0100, scott wrote:

>> The 700k population of students perhaps doesn't fluctuate much, but the
>> difficulty of the questions surely does. But how to control for that?
> 
> Isn't that a perfect reason to have a fixed % of people getting each
> grade?

Depends on whether you need an absolute measurement of skill/knowledge or 
a relative measurement.

Jim

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