← All proof trees · W. B. SAUL HIGH SCHOOL

1. 1
   What you seeKeystone Biology proficiency

   30.2%

   the share of students scoring proficient or advanced on the Keystone Biology exam. Based on 43 students.

   vs. peers

   18th percentile

   vs. citywide

   65th 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 47 default-included schools with a value for this metric, year, and subgroup, this school has a higher value than 30. Midrank rule: (30 + 0/2) / (47 − 1) = 0.652.Stored: 0.652. ✓ 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 / selective / district schools; 11 of 13 peers have a value this year. This school is above 2 of them. Midrank: (2 + 0/2) / (12 − 1) = 0.182; stored 0.182. ✓ matches

   The peers and their values (11)

   Peer school	Value
   CENTRAL HIGH SCHOOL	87.9%
   ACADEMY AT PALUMBO	81.3%
   SCIENCE LEADERSHIP ACADEMY	75.4%
   PARKWAY C.C. MIDDLE COLLEGE	73.9%
   WILLIAM W. BODINE HIGH SCHOOL	69.4%
   ARTS ACADEMY AT BENJAMIN RUSH	61.5%
   CREATIVE AND PERFORMING ARTS	57.6%
   FRANKLIN LEARNING CENTER	46.6%
   LANKENAU HIGH SCHOOL	34.8%
   PARKWAY-NORTHWEST HIGH SCHOOL	20.7%
   MOTIVATION HIGH SCHOOL	10.3%

   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 Biology proficiency

3. 3
   The stored cellThe stored cell

   table

   philly_school_year_metrics

   value

   30.23

   denominator

   43

   suppressed

   false

   citywide_percentile

   0.6522

   comparison_group_percentile

   0.1818

   source_load_id

   96e07ea5-c26b-4f50-acf8-e159bd17d2e0

   Evidence: data model overview

4. 4
   The load that wrote itWritten on 2026-06-04 by sdp_pssa_keystone_2023-24.ts

   source id

   sdp_pssa_keystone_2023-24

   file URL

   https://cdn.philasd.org/offices/performance/Open_Data/School_Performance/PSSA_Keystone/2023_2024_PSSA_Keystone_All_Data.zip

   SHA-256 of the file read

   d89570e75caa9d30bd32f41de7a654b1df298e1a27a8bf6538f6dc4a6cfa9261Copy hash

   bytes

   802,929

   year covered

   2023-24

   code commit

   de835926d57d5e04d34ef3f4666df5b66fa57672

   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 filePSSA & Keystone results, 2023-24

   School District of Philadelphia (Performance Office). Same structure as the 2024-25 file, one year earlier.

   format

   ZIP of CSVs

   join key

   id_eos (= ULCS Code)

   landing page

   https://opendataphilly.org/datasets/sdp-pssa-keystone-performance/

   • Same as the 2024-25 file.
6. 6
   How it was checkedChecks: 0 passed, 1 not run

   • ○ not runBase case against the state file not yet run for this metric (the loader is shared with keystone_algebra_proficiency, whose SDP-side base case passed)
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).

   • The state publishes no student counts for most measures, so served cells carry no denominator.
   • Served from both the district's and the state's files; check the cell's load record.

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