← All proof trees · ROBERT B. POLLOCK SCHOOL

1. 1
   What you seePVAAS growth — Algebra I

   100.00

   the state's PVAAS growth index for math/Algebra I.

   vs. peers

   91th percentile

   vs. citywide

   91th percentile

   unit

   index (publisher's scale)

   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 90 default-included schools with a value for this metric, year, and subgroup, this school has a higher value than 73 and ties 16. Midrank rule: (73 + 16/2) / (90 − 1) = 0.910.Stored: 0.910. ✓ 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-Middle / catchment / district schools; 23 of 40 peers have a value this year. This school is above 19 and ties 4 of them. Midrank: (19 + 4/2) / (24 − 1) = 0.913; stored 0.913. ✓ matches

   The peers and their values (23)

   Peer school	Value
   COPPIN, FANNY JACKSON SCHOOL	100.00
   NORTHEAST COMMUNITY PROPEL ACADEMY	100.00
   GEORGE W. NEBINGER SCHOOL	100.00
   LOUIS H. FARRELL SCHOOL	100.00
   MAYFAIR SCHOOL	97.70
   SOUTHWARK SCHOOL	97.30
   VARE-WASHINGTON ELEMENTARY	95.20
   STEPHEN DECATUR SCHOOL	95.00
   JOHN H. TAGGART SCHOOL	95.00
   BENJAMIN FRANKLIN ELEM. SCHOOL	94.00
   GILBERT SPRUANCE SCHOOL	94.00
   JOSEPH GREENBERG SCHOOL	91.00
   WILLIAM H. ZIEGLER SCHOOL	90.00
   ELIZA B. KIRKBRIDE SCHOOL	88.20
   ETHAN ALLEN SCHOOL	87.00
   THOMAS HOLME SCHOOL	85.00
   GEN. GEORGE A. MCCALL SCHOOL	85.00
   D. NEWLIN FELL SCHOOL	81.00
   ANDREW J. MORRISON SCHOOL	80.00
   GEORGE W CHILDS SCHOOL	80.00
   A.L. FITZPATRICK SCHOOL	77.00
   OLNEY ELEMENTARY SCHOOL	76.00
   HAMILTON DISSTON SCHOOL	72.00

   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: PVAAS growth — Algebra I

3. 3
   The stored cellThe stored cell

   table

   philly_school_year_metrics

   value

   100

   denominator

   null (not published)

   suppressed

   false

   citywide_percentile

   0.9101

   comparison_group_percentile

   0.9130

   source_load_id

   e032c169-8d6b-41ae-acc1-d1662894df3e

   Evidence: data model overview

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

   source id

   futurereadypa_performance_2022-23

   file URL

   https://futurereadypa.org/home/getdatafile?id=44

   SHA-256 of the file read

   81fdf381405cc672abedc15bd58df21600418ca60df5c72dcf5e865581afb79dCopy hash

   bytes

   4,888,926

   year covered

   2022-23

   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, 2022-23

   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: 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.

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