Reply to 26-27 Lottery data up

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[quote=Anonymous][quote=Anonymous]Huh. This doesn’t line up with my results in a weird way.

My K matched at John Lewis (our #5 choice). Her brother was waitlisted there with waitlist #1 for 1st grade (and he matched with our #6 choice). Both kids’ lists were exactly the same.

I assumed this was because Lewis either didn’t offer any seats for 1st grade or offered one or two and they got taken by siblings. Fine.

But looking at this dashboard, Lewis took FIVE kids for 1st grade, four of whom were no preference. How on earth did four kids with no preference match when my kid, whose results clearly show a preference of “Sibling Offered” wasn’t offered a seat?

I was under them impression that this could only happen if my kid had matched to a school he ranked higher (then he’d be #1 on the waitlist where his sister matched). But that’s not the case - he matched with our #6 school.

Anyone have any idea how this could have happened? This is messing with my whole understanding of how the lottery works. [/quote]

I'm this PP, and I wanted to follow up with an update. I just got off the phone with the MySchoolDC folks. The short version of the story is that, while the algorithm is complicated and things are definitely happening quickly and at overlapping times, as a generally rule, "sibling offered" preference is applied from the top down. Essentially that means that the lottery is run not all at exactly the same time, but starting with 12th graders and working its way down to PK3. Generally, this works out pretty well, as older siblings pull in their younger siblings. But in my case, my K got a WAY better number than my 1st grader and was the one who matched, but too late to pull in the 1st grader.

That also means that with twins, they're much more likely to pull each other in via "Sibling Offered" because they're in the same grade and thus getting pulled into the algorithm at the same time.

Pretty interesting![/quote]

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