# Acct vs Actual population-cut diff — Philly PSSA

Per O.8 (locked 2026-06-03): SDP publishes PSSA in two population cuts;

Acct is canonical, Actual is co-loaded. This report lists per-school deltas

at every (school, year, metric, subgroup) where both have a non-null served

value. NYC had to reverse-engineer this gap; Philly publishes both natively.


## Finding (2026-09-07): the two published cuts are the same file

SDP's 2024-25 archive ships PSSA_Keystone_Schools_Acct_Suppressed.csv and
PSSA_Keystone_Schools_Actual_Suppressed.csv with identical byte counts; sorted,
the two files are line-for-line identical (28,525 rows; 0 differing denominators,
0 differing proficiency values). The zero-delta result below is therefore NOT
evidence that the accountability cohort and all-tested populations agree — it is
evidence that one dataset was published under two names. Until SDP clarifies,
the served 'acct' and 'actual' cuts carry the same numbers and this check has no
discriminating power. Flagged on every PSSA/Keystone proof tree.


## Overall

```json
{
  "name": "ALL",
  "n": 9078,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 9078,
  "n_le_1pp": 9078,
  "n_gt_5pp": 0
}
```

## By metric

### keystone_algebra_proficiency
```json
{
  "name": "keystone_algebra_proficiency",
  "n": 298,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 298,
  "n_le_1pp": 298,
  "n_gt_5pp": 0
}
```
### keystone_biology_proficiency
```json
{
  "name": "keystone_biology_proficiency",
  "n": 293,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 293,
  "n_le_1pp": 293,
  "n_gt_5pp": 0
}
```
### keystone_literature_proficiency
```json
{
  "name": "keystone_literature_proficiency",
  "n": 294,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 294,
  "n_le_1pp": 294,
  "n_gt_5pp": 0
}
```
### pssa_all_ela_proficiency
```json
{
  "name": "pssa_all_ela_proficiency",
  "n": 1018,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 1018,
  "n_le_1pp": 1018,
  "n_gt_5pp": 0
}
```
### pssa_all_math_proficiency
```json
{
  "name": "pssa_all_math_proficiency",
  "n": 1018,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 1018,
  "n_le_1pp": 1018,
  "n_gt_5pp": 0
}
```
### pssa_grade3_ela_proficiency
```json
{
  "name": "pssa_grade3_ela_proficiency",
  "n": 544,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 544,
  "n_le_1pp": 544,
  "n_gt_5pp": 0
}
```
### pssa_grade3_math_proficiency
```json
{
  "name": "pssa_grade3_math_proficiency",
  "n": 550,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 550,
  "n_le_1pp": 550,
  "n_gt_5pp": 0
}
```
### pssa_grade4_ela_proficiency
```json
{
  "name": "pssa_grade4_ela_proficiency",
  "n": 566,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 566,
  "n_le_1pp": 566,
  "n_gt_5pp": 0
}
```
### pssa_grade4_math_proficiency
```json
{
  "name": "pssa_grade4_math_proficiency",
  "n": 567,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 567,
  "n_le_1pp": 567,
  "n_gt_5pp": 0
}
```
### pssa_grade5_ela_proficiency
```json
{
  "name": "pssa_grade5_ela_proficiency",
  "n": 559,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 559,
  "n_le_1pp": 559,
  "n_gt_5pp": 0
}
```
### pssa_grade5_math_proficiency
```json
{
  "name": "pssa_grade5_math_proficiency",
  "n": 559,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 559,
  "n_le_1pp": 559,
  "n_gt_5pp": 0
}
```
### pssa_grade6_ela_proficiency
```json
{
  "name": "pssa_grade6_ela_proficiency",
  "n": 478,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 478,
  "n_le_1pp": 478,
  "n_gt_5pp": 0
}
```
### pssa_grade6_math_proficiency
```json
{
  "name": "pssa_grade6_math_proficiency",
  "n": 478,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 478,
  "n_le_1pp": 478,
  "n_gt_5pp": 0
}
```
### pssa_grade7_ela_proficiency
```json
{
  "name": "pssa_grade7_ela_proficiency",
  "n": 459,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 459,
  "n_le_1pp": 459,
  "n_gt_5pp": 0
}
```
### pssa_grade7_math_proficiency
```json
{
  "name": "pssa_grade7_math_proficiency",
  "n": 456,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 456,
  "n_le_1pp": 456,
  "n_gt_5pp": 0
}
```
### pssa_grade8_ela_proficiency
```json
{
  "name": "pssa_grade8_ela_proficiency",
  "n": 471,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 471,
  "n_le_1pp": 471,
  "n_gt_5pp": 0
}
```
### pssa_grade8_math_proficiency
```json
{
  "name": "pssa_grade8_math_proficiency",
  "n": 470,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 470,
  "n_le_1pp": 470,
  "n_gt_5pp": 0
}
```

## By subgroup

### ALL
```json
{
  "name": "ALL",
  "n": 4118,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 4118,
  "n_le_1pp": 4118,
  "n_gt_5pp": 0
}
```
### FEMALE
```json
{
  "name": "FEMALE",
  "n": 2483,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 2483,
  "n_le_1pp": 2483,
  "n_gt_5pp": 0
}
```
### MALE
```json
{
  "name": "MALE",
  "n": 2477,
  "mean": 0.0,
  "median": 0.0,
  "stdev": 0.0,
  "min": 0.0,
  "max": 0.0,
  "n_zero": 2477,
  "n_le_1pp": 2477,
  "n_gt_5pp": 0
}
```

## Largest 30 absolute deltas

- GEN. GEORGE A. MCCALL SCHOOL     (2340) 2024-25 pssa_grade6_ela_proficiency MALE: acct=67.65 actual=67.65 Δ=+0.00
- ADD B. ANDERSON SCHOOL           (1460) 2024-25 pssa_grade7_math_proficiency ALL: acct=9.52 actual=9.52 Δ=+0.00
- THOMAS G. MORTON SCHOOL          (1380) 2024-25 pssa_grade4_ela_proficiency FEMALE: acct=17.39 actual=17.39 Δ=+0.00
- THOMAS G. MORTON SCHOOL          (1380) 2024-25 pssa_grade5_ela_proficiency MALE: acct=20.00 actual=20.00 Δ=+0.00
- EDWIN M. STANTON SCHOOL          (2450) 2024-25 pssa_grade4_ela_proficiency MALE: acct=50.00 actual=50.00 Δ=+0.00
- WILLIAM C. BRYANT SCHOOL         (1230) 2024-25 pssa_grade3_ela_proficiency ALL: acct=16.13 actual=16.13 Δ=+0.00
- THOMAS G. MORTON SCHOOL          (1380) 2024-25 pssa_grade3_ela_proficiency MALE: acct=17.39 actual=17.39 Δ=+0.00
- D. NEWLIN FELL SCHOOL            (2190) 2024-25 pssa_grade5_ela_proficiency ALL: acct=36.54 actual=36.54 Δ=+0.00
- GEN. GEORGE A. MCCALL SCHOOL     (2340) 2024-25 pssa_grade3_ela_proficiency MALE: acct=76.74 actual=76.74 Δ=+0.00
- EDWIN M. STANTON SCHOOL          (2450) 2024-25 pssa_grade4_ela_proficiency FEMALE: acct=65.22 actual=65.22 Δ=+0.00
- EDWIN M. STANTON SCHOOL          (2450) 2024-25 pssa_all_ela_proficiency FEMALE: acct=63.04 actual=63.04 Δ=+0.00
- EDWIN M. STANTON SCHOOL          (2450) 2024-25 pssa_all_ela_proficiency MALE: acct=50.00 actual=50.00 Δ=+0.00
- ADD B. ANDERSON SCHOOL           (1460) 2024-25 pssa_grade3_math_proficiency ALL: acct=21.95 actual=21.95 Δ=+0.00
- ADD B. ANDERSON SCHOOL           (1460) 2024-25 pssa_grade8_math_proficiency ALL: acct=2.78 actual=2.78 Δ=+0.00
- ADD B. ANDERSON SCHOOL           (1460) 2024-25 pssa_grade6_math_proficiency ALL: acct=2.70 actual=2.70 Δ=+0.00
- ADD B. ANDERSON SCHOOL           (1460) 2024-25 pssa_grade4_math_proficiency ALL: acct=0.00 actual=0.00 Δ=+0.00
- GEN. GEORGE A. MCCALL SCHOOL     (2340) 2024-25 pssa_grade4_ela_proficiency MALE: acct=82.05 actual=82.05 Δ=+0.00
- JOHN BARRY ELEMENTARY SCHOOL     (1200) 2024-25 pssa_all_math_proficiency MALE: acct=4.51 actual=4.51 Δ=+0.00
- PENN ALEXANDER SCHOOL            (1280) 2024-25 pssa_grade6_math_proficiency ALL: acct=86.21 actual=86.21 Δ=+0.00
- MIDDLE YEARS ALTERNATIVE-MYA     (1580) 2024-25 pssa_grade7_math_proficiency ALL: acct=23.08 actual=23.08 Δ=+0.00
- MORTON MC MICHAEL SCHOOL         (1360) 2024-25 pssa_grade4_math_proficiency ALL: acct=28.00 actual=28.00 Δ=+0.00
- GEORGE W CHILDS SCHOOL           (2260) 2024-25 pssa_grade8_ela_proficiency FEMALE: acct=30.00 actual=30.00 Δ=+0.00
- TILDEN MIDDLE SCHOOL             (1130) 2024-25 pssa_all_ela_proficiency ALL: acct=12.02 actual=12.02 Δ=+0.00
- LAURA W. WARING SCHOOL           (2490) 2024-25 pssa_grade4_math_proficiency ALL: acct=20.00 actual=20.00 Δ=+0.00
- LAURA W. WARING SCHOOL           (2490) 2024-25 pssa_all_ela_proficiency FEMALE: acct=39.02 actual=39.02 Δ=+0.00
- MIDDLE YEARS ALTERNATIVE-MYA     (1580) 2024-25 pssa_all_ela_proficiency FEMALE: acct=30.00 actual=30.00 Δ=+0.00
- ROBERT MORRIS SCHOOL             (2390) 2024-25 pssa_grade6_math_proficiency ALL: acct=4.76 actual=4.76 Δ=+0.00
- GEORGE W CHILDS SCHOOL           (2260) 2024-25 pssa_all_ela_proficiency ALL: acct=30.57 actual=30.57 Δ=+0.00
- TILDEN MIDDLE SCHOOL             (1130) 2024-25 pssa_grade8_ela_proficiency FEMALE: acct=9.38 actual=9.38 Δ=+0.00
- PENROSE SCHOOL                   (1440) 2024-25 pssa_grade3_ela_proficiency ALL: acct=12.00 actual=12.00 Δ=+0.00