Reply to Common Lottery Algorithm

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[quote=Anonymous][quote=Anonymous]It would be nice if this thread was just obliterated and replaced with one full of facts directly from the MySchoolDC Team.

Anyway, this is article: http://www.washingtonpost.com/local/education/dc-rolls-out-unified-enrollment-lottery-for-traditional-charter-schools/2013/11/19/448ee1e0-4ca7-11e3-9890-a1e0997fb0c0_story.html

Leads me to this website: 
http://iipsc.org/publications.htm

Which leads me to this article:
http://www.nola.com/education/index.ssf/2012/04/centralized_enrollment_in_reco.html

which seems to spell it out pretty clear:

You rank the schools.  The schools rank you.  The two are weighed against each other in a sorting algorithm and the optimal placement is achieved. [/quote]

Thanks for the link, the key there for me to understand it was in the graphic, where it describes the process.  "highest rank for THAT PARTICULAR SCHOOL...based on that student's random lottery number, sibling preference, and proximity"  Therefore, this is how I see it:

1.  All of the students who apply for a particular school are ordered by their preference group, and then randomly ordered inside each preference group. In that way, yes, there is a lottery for each school independently.  You aren't given a system-wide lottery number that places you really high on all of the schools or really low.

2.  This gives the school an ordered list of IT'S priorities, based on preference groups and then random assignments inside each group.

3.  Then the matching process starts as in the diagram.

I wrote yesterday about the idea of "first going through all of the students who ranked the school first, then all of them who ranked it second, etc".  I don't think that is right now.  It still matters how you ranked your schools.  But if you are first in the random lottery for a particular school and have it listed 10th, you will get in, as long as you don't get in to the 9 schools above it.

That's how I read it.  Could be wrong.

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