← All proof trees · THURGOOD MARSHALL SCHOOL

1. 1
   What you seeAverage daily attendance

   87.9%

   the school's year-to-date average daily attendance rate — the share of enrolled student-days actually attended.

   vs. peers

   45th percentile

   vs. citywide

   40th percentile

   unit

   percent

   direction

   higher is better

2. 2
   How it was computedvalue = published 'Average Daily Attendance (YTD)'

   1. Read the district's ADA CSV; keep directory schools; store the published rate (all students only).

   Citywide percentile, reconstructed right now

   Among 216 default-included schools with a value for this metric, year, and subgroup, this school has a higher value than 87. Midrank rule: (87 + 0/2) / (216 − 1) = 0.405.Stored: 0.405. ✓ 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; 40 of 40 peers have a value this year. This school is above 18 of them. Midrank: (18 + 0/2) / (41 − 1) = 0.450; stored 0.450. ✓ matches

   The peers and their values (40)

   Peer school	Value
   GEORGE W. NEBINGER SCHOOL	92.9%
   ANNA L. LINGELBACH SCHOOL	92.7%
   JENKS ACADEMY ARTS & SCIENCES	92.6%
   EDWIN M. STANTON SCHOOL	91.7%
   SHAWMONT SCHOOL	91.7%
   ANDREW J. MORRISON SCHOOL	91.5%
   THOMAS K. FINLETTER SCHOOL	91.2%
   AMEDEE F. BREGY SCHOOL	91.0%
   HENRY C. LEA SCHOOL	91.0%
   GILBERT SPRUANCE SCHOOL	90.9%
   J.H. BROWN ACADEMICS PLUS SCHL	90.9%
   BENJAMIN FRANKLIN ELEM. SCHOOL	90.5%
   ROBERT B. POLLOCK SCHOOL	90.4%
   OLNEY ELEMENTARY SCHOOL	90.4%
   MIFFLIN, THOMAS SCHOOL	90.1%
   WILLIAM H. ZIEGLER SCHOOL	89.9%
   GEORGE W CHILDS SCHOOL	89.6%
   ROBERT E. LAMBERTON ELEMENTARY	89.2%
   GEN. PHILIP KEARNY SCHOOL	88.6%
   SPRING GARDEN SCHOOL	88.3%
   PAUL L. DUNBAR SCHOOL	88.2%
   H.A. BROWN ACADEMICS PLUS SCH	88.2%
   EDWARD T. STEEL SCHOOL	87.8%
   HAMILTON DISSTON SCHOOL	87.6%
   COOKE ELEMENTARY SCHOOL	87.3%
   MARY BETHUNE SCHOOL	87.3%
   PENROSE SCHOOL	87.0%
   JAMES R. LUDLOW SCHOOL	86.9%
   ALLEN M. STEARNE SCHOOL	86.8%
   WILLIAM MCKINLEY SCHOOL	86.7%
   KENDERTON ELEMENTARY	86.6%
   JOHN WELSH SCHOOL	86.3%
   ALAIN LOCKE SCHOOL	86.2%
   ROBERT MORRIS SCHOOL	85.7%
   LAURA W. WARING SCHOOL	84.9%
   JOHN F. HARTRANFT SCHOOL	84.8%
   LEWIS C CASSIDY ACADEMICS PLUS	83.8%
   GEN. GEORGE G. MEADE SCHOOL	83.7%
   DELAPLAINE MCDANIEL SCHOOL	83.6%
   RHODES ELEMENTARY SCHOOL	82.8%

   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: Average daily attendance

3. 3
   The stored cellThe stored cell

   table

   philly_school_year_metrics

   value

   87.93

   denominator

   null (not published)

   suppressed

   false

   citywide_percentile

   0.4047

   comparison_group_percentile

   0.4500

   source_load_id

   991bf9c1-3c0a-4123-a2e4-047cd97088e6

   Evidence: data model overview

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

   source id

   sdp_attendance_ada_school

   file URL

   https://cdn.philasd.org/offices/performance/Open_Data/School_Performance/Attendance/Student_ADA_Yearly_School_20260211.csv

   SHA-256 of the file read

   04e0893c5f84e6280c21682db3f653c2578ad68c7d12ded39f6e3f3165cb50c7Copy hash

   bytes

   59,816

   year covered

   —

   code commit

   f75e33137e8166eec3f8b5a4b39463d306ef710c

   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 fileAverage daily attendance, by school and year

   School District of Philadelphia (Performance Office). Each school's year-to-date average daily attendance rate (share of enrolled days attended), all students only.

   format

   CSV

   join key

   ULCS Code

   landing page

   https://opendataphilly.org/datasets/sdp-school-performance/

   • District sector only.
6. 6
   How it was checkedChecks: 0 passed, 1 not run

   • ○ not runNo separate base-case report; same loader and file family as attendance_rate_above_90
7. 7
   Assumptions & caveatsAssumptions and caveats

   Stored as published; no modeling assumptions.

   • District-run schools only.
   • All-students figure only; no subgroups published.

   Algorithms involved: Citywide and peer-group percentiles, Peer groups: 40 nearest neighbors on demographics