← All proof trees · FOX CHASE SCHOOL

1. 1
   What you seeKeystone Algebra I proficiency

   17.9%

   the share of students scoring proficient or advanced on the Keystone Algebra I end-of-course exam.

   vs. peers

   79th percentile

   vs. citywide

   90th percentile

   unit

   percent

   direction

   higher is better

2. 2
   How it was computedvalue = the state's published percentage for the school × subgroup, as-is

   1. Read the state's wide-format datafile: one row per Pennsylvania school, one column per measure × subgroup (e.g. PercentPersistentAttendance_Black).
   2. Keep Philadelphia rows by mapping the state's AUN + Schl codes to the district's ULCS code through the Master School List.
   3. Unpivot each recognized measure × subgroup column into one served cell; state suppression codes ('IS', '--', '*') are stored as suppressed.

   Citywide percentile, reconstructed right now

   Among 264 default-included schools with a value for this metric, year, and subgroup, this school has a higher value than 236 and ties 2. Midrank rule: (236 + 2/2) / (264 − 1) = 0.901.Stored: 0.901. ✓ 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 Elementary / catchment / district schools; 36 of 40 peers have a value this year. This school is above 28 and ties 1 of them. Midrank: (28 + 1/2) / (37 − 1) = 0.792; stored 0.792. ✓ matches

   The peers and their values (36)

   Peer school	Value
   WATSON COMLY SCHOOL	28.1%
   WILLIAM H. LOESCHE SCHOOL	25.0%
   JOHN MOFFET SCHOOL	23.3%
   HENRY W. LAWTON SCHOOL	21.9%
   HACKETT SCHOOL	18.6%
   LAURA H. CARNELL SCHOOL	18.6%
   ANNE FRANK SCHOOL	18.5%
   GLORIA CASAREZ ELEMENTARY SCHOOL	17.9%
   RICHARD WRIGHT SCHOOL	14.8%
   JAMES LOGAN SCHOOL	13.8%
   JOHN B. KELLY SCHOOL	13.5%
   WILLIAM CRAMP SCHOOL	12.9%
   ELEANOR C. EMLEN SCHOOL	10.9%
   BAYARD TAYLOR SCHOOL	10.9%
   SAMUEL POWEL SCHOOL	10.5%
   RICHMOND SCHOOL	8.1%
   ELLWOOD SCHOOL	7.7%
   J. HAMPTON MOORE SCHOOL	7.6%
   CAYUGA SCHOOL	7.1%
   JOHN MARSHALL SCHOOL	7.1%
   SOLOMON SOLIS-COHEN SCHOOL	6.3%
   JOHN H. WEBSTER SCHOOL	6.2%
   THOMAS G. MORTON SCHOOL	5.8%
   FELTONVILLE INTERMEDIATE	5.6%
   JAMES J. SULLIVAN SCHOOL	5.4%
   JOHN M. PATTERSON SCHOOL	5.0%
   EDWIN FORREST SCHOOL	4.5%
   KENNEDY C. CROSSAN SCHOOL	4.0%
   FRANCIS SCOTT KEY SCHOOL	3.7%
   JOSEPH W. CATHARINE SCHOOL	3.3%
   LEWIS ELKIN SCHOOL	2.3%
   HOWE ACADEMICS PLUS SCHOOL	0.0%
   JAMES R. LOWELL SCHOOL	0.0%
   ALEXANDER MCCLURE SCHOOL	0.0%
   RHAWNHURST SCHOOL	0.0%
   FRANCES E. WILLARD SCHOOL	0.0%

   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: Keystone Algebra I proficiency

3. 3
   The stored cellThe stored cell

   table

   philly_school_year_metrics

   value

   17.9

   denominator

   null (not published)

   suppressed

   false

   citywide_percentile

   0.9011

   comparison_group_percentile

   0.7917

   source_load_id

   2fdcb9ea-d4af-4a48-a7cf-a8e6166696b3

   Evidence: data model overview

4. 4
   The load that wrote itWritten on 2026-09-08 by futurereadypa_performance.ts

   source id

   futurereadypa_performance_2023-24

   file URL

   https://futurereadypa.org/home/getdatafile?id=49

   SHA-256 of the file read

   89219f7a7ffbc6adc14f54e87f2872ab04ce12a9e0749c448cf54998e4930e90Copy hash

   bytes

   4,861,549

   year covered

   2023-24

   code commit

   c19ea6ec845c65bcc40eb49644be1c7e67b05f25

   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 fileFuture Ready PA Index datafile, 2023-24

   Pennsylvania Department of Education (Future Ready PA Index). Same structure as the 2024-25 file.

   format

   XLSX (wide)

   join key

   AUN + Schl → ULCS

   landing page

   https://futurereadypa.org/Home/DataFiles

   • Same as 2024-25.
6. 6
   How it was checkedChecks: 1 passed, 1 flagged

   • ✓ passedBase case (district file, 2024-25): 54 of 54 unsuppressed cells match
   • ⚠ flaggedCross-publisher sanity check (state vs district)

   Checked at ±1: 0 mismatches, 0 cells served but absent from the file, 0 in the file but not served (ALL, acct, latest year).

   Evidence: Base case (district file, 2024-25) · Cross-publisher sanity check (state vs district)

7. 7
   Assumptions & caveatsAssumptions and caveats

   • The state's AUN + Schl → ULCS mapping from the 2024-25 Master School List is correct. State rows for schools not in that directory — district schools that closed before 2024-25 — are not loaded, so every year of state data is a survivor-only panel; cyber charters have their own AUNs and are outside the district's directory.
   • Where two directory schools share a state code (a school and its Continuation Academy), the state's single row belongs to the main school (deterministic rule; the full absenteeism QA lists every shared code).

   • Served from both the district's file (district-run schools) and the state's file (all schools); check the load record on a cell to see which.

   Algorithms involved: Reading the state's wide-format datafile, Citywide and peer-group percentiles, Peer groups: 40 nearest neighbors on demographics