← All proof trees · HORACE FURNESS HIGH SCHOOL

1. 1
   What you seeEnrollment

   1,792

   the school's October 1 enrollment (all grades).

   vs. peers

   65th percentile

   vs. citywide

   85th percentile

   unit

   count

   direction

   neither direction is 'better'

2. 2
   How it was computedvalue = Σ enrollment across the school's grade rows

   1. Read the district's enrollment file (one row per school × grade).
   2. Sum counts across grades to the school level.
   3. Divide the group count by total enrollment to get a share; storing shares re-derived from counts (rather than averaging per-grade percentages) weights grades by their size.

   Citywide percentile, reconstructed right now

   Among 330 default-included schools with a value for this metric, year, and subgroup, this school has a higher value than 281. Midrank rule: (281 + 0/2) / (330 − 1) = 0.854.Stored: 0.854. ✓ matches

   How percentiles are computed · How peer groups are chosen

   Peer percentile, reconstructed right now

   Peer group: up to 40 of the demographically nearest schools among High / catchment / district schools; 20 of 20 peers have a value this year. This school is above 13 of them. Midrank: (13 + 0/2) / (21 − 1) = 0.650; stored 0.650. ✓ matches

   The peers and their values (20)

   Peer school	Value
   NORTHEAST HIGH SCHOOL	6,934
   ABRAHAM LINCOLN HIGH SCHOOL	4,878
   GEORGE WASHINGTON HIGH SCHOOL	3,526
   SAMUEL S. FELS HIGH SCHOOL	2,518
   OLNEY HIGH SCHOOL	2,296
   THOMAS EDISON HIGH SCHOOL	2,040
   FRANKFORD HIGH SCHOOL	1,822
   WEST PHILADELPHIA HIGH SCHOOL	1,438
   SOUTH PHILADELPHIA HIGH SCHOOL	1,312
   ROXBOROUGH HIGH SCHOOL	1,226
   JOHN BARTRAM HIGH SCHOOL	1,178
   BENJAMIN FRANKLIN HIGH SCHOOL	1,140
   MARTIN L. KING HIGH SCHOOL	1,092
   KENSINGTON CAPA	1,018
   KENSINGTON HIGH SCHOOL	918
   KENSINGTON HEALTH SCIENCES	914
   SAYRE HIGH SCHOOL	894
   OVERBROOK HIGH SCHOOL	882
   STRAWBERRY MANSION HIGH SCHOOL	614
   VAUX BIG PICTURE HIGH SCHOOL	574

   Note: stored percentiles are computed by a batch script after loads; a difference from the live reconstruction means a newer load changed the comparison set and the batch has not been re-run.

   Evidence: metric tree: Enrollment

3. 3
   The stored cellThe stored cell

   table

   philly_school_year_metrics

   value

   1792

   denominator

   null (not published)

   suppressed

   false

   citywide_percentile

   0.8541

   comparison_group_percentile

   0.6500

   source_load_id

   f4c317af-16df-4cfe-8454-7b9361cd81cd

   Evidence: data model overview

4. 4
   The load that wrote itWritten on 2026-06-03 by sdp_enrollment_demographics.ts

   source id

   sdp_enrollment_demographics_school_2024-25

   file URL

   https://cdn.philasd.org/offices/performance/Open_Data/School_Information/Enrollment_Demographics_School/2024-2025%20Enrollment%20&%20Demographics.csv

   SHA-256 of the file read

   80f169f31c3e31f7f7a4d84138a46caa45f9b16162208c5b02784349fb2f133dCopy hash

   bytes

   492,606

   year covered

   2024-25

   code commit

   63ddc08c2a63170cecb6e78b991559cef9aa3926

   To confirm you have the same file: download it from the URL above, then run shasum -a 256 <downloaded file> Copy command — the output should equal the hash above. If the publisher has since replaced the file, the hashes will differ, which is itself useful to know.

   Evidence: loader script · first-fetch findings for this file · source registry

5. 5
   The publisher's fileEnrollment & Demographics, 2024-25

   School District of Philadelphia. October 1 enrollment counts by school and grade, with counts by race/ethnicity, gender, economic disadvantage, English-learner status, and special education.

   format

   CSV (one row per school × grade)

   join key

   ULCS Code

   landing page

   https://opendataphilly.org/datasets/sdp-school-enrollment-and-demographics/

   • Economic disadvantage is recorded as 100% at most district schools (community-eligibility meal reporting), so it can't distinguish schools.
6. 6
   How it was checkedChecks: 0 passed, 1 not run

   • ○ not runNo base-case report yet for demographics (aggregation is arithmetic on published counts; see the algorithm page)
7. 7
   Assumptions & caveatsAssumptions and caveats

   • October 1 enrollment is the reference population for the whole school year.

   • 2024-25 only.

   Algorithms involved: School demographic shares from per-grade counts