Reply to DC CAS popular schools summary

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[quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous]Here's the sad part: The number being reported is the percentage scoring "proficient" or above. The cut-off for proficient on the DC-CAS puts you at the 16th percentile nationwide. Basically, if your school isn't scoring 84% proficient or higher, it's below average for a US school. I count ten schools that meet that level.[/quote]

Did you attend Capitol Hill Montessori with your math skills or taught math there?

If the cut-off for "proficient" is the equivalent of the 16th percentile nationwide and a school scores 34% proficient math - it means that 34% of the students are at the 16th percentile or above nationwide for math.

Not that you need 84% of the students to be proficient or above to beat the national avg.  You cannot simple subtract  100%-16%=84%.  Those numbers are talking about 2 entirely different things.[/quote]

"The cut-off for proficient on the DC-CAS puts you at the 16th percentile nationwide" means that nationwide, 84% of students score proficient or above. I'll agree, it was a little imprecise to say that a school scoring below 84% proficient is "below average for a US school." What would be more correct would be to say that a school scoring below 84% is below what you would expect if you selected a group of US citizens at random. But you're way off base saying "those numbers are talking about 2 entirely different things." A typical student at the school in your example, where 34% score proficient, is clearly behind a typical US student.

Which brings up a peeve of mine, the way in which DC-CAS scores are reported. Specifically, they are reported in a way to obscure as much information as possible. Kids take the test, they get a percent correct. It would be very easy just to report the average percent correct for each school -- and perhaps throw in the standard deviation for the statistically minded. But instead they collect them into groups, and report the percentage in each group -- which is more work, and provides less information. Since it is more work, I have to conclude that DCPS does this deliberately, because they don't want people knowing the raw test scores.[/quote]

No, those DCPS schools scoring 84% proficient reading/math on the DC-CAS has 84% of its students scoring in the 16th percentile in reading/math nationally according to your numbers.  I agree not a high standard by any means.  I hope you are not a math teacher...[/quote]

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