Anonymous wrote:I'm 15:55. Thanks PP for the explanation. With that in hand, I'm going to sort through the data we have to see if things make sense. Just as a test, I'll focus on Key Elementary, because it's entirely within Ward 3, so that will keep things cleaner.
1. According to your data from Cheh, Key ES is 93% Ward 3 students.
2. Key's 2016-17 enrollment is 386.
http://profiles.dcps.dc.gov/pdf/272_ES_16-17.pdf
3. Key's enrollment in 2015-16 was also 386.
https://goo.gl/Un9DF7
4. Key has 359 students living in Ward 3, and 27 not living in Ward 3. (93% of 386 = 359)
5. The 27 not living in Ward 3 are OOB students.
6. In theory, some of the 358 Ward 3 students might also be OOB for Key, even if they're living in Ward 3.
7. Key's IB enrollment is 83%.
https://goo.gl/Un9DF7
8. 320 of Key's students live IB for Key. (83% of 386 = 320)
9. 66 of Key's students are OOB. (386-320=66)
10. 39 Key students live in Ward 3, but are OOB for Key. (66-27=39)
11. Key's IB participation rate is 91%.
https://goo.gl/Un9DF7
12. There are 352 public school students living IB for Key. (91% of 352 = 320)
13. In 2014-15, when the school boundaries were being revised, DCPS predicted that the new Key boundary would have 310 IB public school students.
https://goo.gl/e5UDbd
14. In 2014-15, DCPS predicted some small growth, which likely accounts for the increase from 310 to 320 IB public school students.
15. Key's building capacity is 320 students.
https://goo.gl/e5UDbd
16. Key is even more overcapacity now than it was before the boundaries shrank.
https://goo.gl/e5UDbd
17. Without the OOB students (whether Ward 3 or not), Key would be right at building capacity. (Items 8 & 15)
I'm guessing a lot of the 39 students who are in Ward 3 but OOB for Key are ones who were previously within Key's boundary, but we pushed to OOB status when the boundaries changed. I'm not sure what to make of the 27 non-Ward 3 OOB students.
It would be interesting to do this same exercise with each of the schools, to see whether the boundary changes had the expected impact or made any improvements.