Reply to MCPS percentiles based on current school and not county or home school?

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[quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous](Re-posted from another similar thread: https://www.dcurbanmom.com/jforum/posts/list/0/781550.page#14429226)

My husband actually called the central office and they said that the CES students's percentiles were calculated based on their current elementary school's SES. They then use the outcome of that ES-based calculation to identify a cohort at the middle school (which may also have a different feeder group and SES that the CES from which the student was calculated, but that's not taken into account). They also said that there may be a difference in the calculation at our home school, but it's unlikely to be much of a difference as to final outcome of cohort, but they can't be sure without a recalculation, which they won't do unless specifically requested on an appeal. (In our case, the CES ES has about 50% FARMS, but our home ES has about 80% FARMS.) This supports the suspicion that students in the CES are less likely to be accepted into the magnets, especially if their "cohorts" are being determined based on numbers that are skewed in different ways from the home schools.[/quote]
Let me get this straight-
So a poor FARMS child at Chevy Chase CES which is not high FARMS would be compared to those in the the high SES group so this child who is very bright ends up at only 80th percentile.
Let's say that child is supposed to go to Silver Creek MS which is middle SES. 
She's competing against children from Rock Creek Forest which is middle SES. They have lower scores nationally than the Chevy Chase child but because they are being compared to a different peer group they are 99th percentile.

Are you saying that they would compare the Chevy Chase CES child's 80th percentile against the Rock Creek Forest child's 99th percentile in admissions for magnets? If so, that makes no sense and supports this idea that kids at CES are being penalized. [/quote]

Well, you are making a huge assumption that the difference between the high SES and middle SES groups could make a student who is lower percentile nationally 19 percentage points higher than a student in the other group who is actually higher nationally.  I think that's really unlikely, but only someone with access to all the numbers could say for sure.  If you have two students who are both 98% nationally and one from a low SES group ends up with an MCPS 99% and one from a high SES group ends up with an MCPS 96% do you still think that makes no sense?  We don't know what these numbers actually are and how much the national % and MCPS % are different, but based on what 5th grade parents were reporting on other threads I don't think you can be 98 or 99% nationally and be 80% MCPS.  I don't think it changes that much.  They are reporting both scores to parents, so if there are differences that large, there should be people here who can attest to it (of course, anonymous, so...)[/quote]

My child's national verbal percentile was 97% and MCPS percentile was 78%. That seems like a large swing. The difference in quantitative was smaller - 99% national and 92% MCPS. The nonverbal was overall lower but also a large spread 79% and 49%
 
So yes, it can be a big change between national and MCPS percentiles.

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