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[quote=Anonymous][quote=Anonymous]10:00 is wrong.  There is a set score for proficient.  [/quote]

10:00 here: Glad to stand corrected but what would that "set" score be, please? Or maybe we actually mean the same thing? What I'm saying is that, say, the 5th grade DC-CAS test comprises a number of questions yielding a maximum of 100 points, and 25% of the test takers score at least 68 out of 100, 50% score at least 54, and 75% score 36, then the "set" score for "advanced" in 5th grade that year is 68. A score of 54 to 67 gets you a "proficient" rating. And a score of 36 to 53 is rated basics. Anything below 36 is below basics.

Maybe what I'm getting wrong is that it's not as empirical as that and the "set" scores are predefined on the basis of expected or least year's quartiles rather than actually observed quartiles. But unless someone gives me better details then I'm quite certain that this is more or less how it works.
Of course, my statistical conscience would much prefer averages than quartiles. In the above example, scoring 54 or scoring 67 is actually a huge difference. And schools that have a large portion of students below proficient may have a lot just below the 54 mark or they may have a lot near the 36 mark, which is a whole different story.[/quote]

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