ABC Unified: math · Schoolio

The shaded band is this district's normal range. If nothing about how it works changes, nearly every future year should land inside it. Zero means the typical student just meets the state standard. The small numbers under the years are how many students were tested.

Step 1 · Each year's result

For each grade tested, take the average (mean) scale score from the California Department of Education's results file, and subtract the lowest score that counts as "Standard Met" for that grade. That is the grade's distance from standard. Weight each grade by its share of the students tested, then add the grades up. Grades where the state hides the average because ten or fewer students tested are left out entirely.

2015 from sb_ca2015_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	20,390	2444.0	− 2436	8	× 1532 / 10928	1.1
4	20,391	2480.8	− 2485	−4.2	× 1535 / 10928	−0.6
5	20,394	2512.0	− 2528	−16	× 1538 / 10928	−2.3
6	20,395	2546.8	− 2552	−5.2	× 1599 / 10928	−0.8
7	20,398	2551.0	− 2567	−16	× 1595 / 10928	−2.3
8	20,399	2584.0	− 2586	−2	× 1520 / 10928	−0.3
11	20,402	2602.9	− 2628	−25.1	× 1609 / 10928	−3.7
Sum, rounded to a whole point						−9

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	19,346	2452.8	− 2436	16.8	× 1542 / 11023	2.4
4	19,348	2491.9	− 2485	6.9	× 1559 / 11023	1
5	19,350	2520.9	− 2528	−7.1	× 1539 / 11023	−1
6	19,352	2557.8	− 2552	5.8	× 1567 / 11023	0.8
7	19,354	2571.8	− 2567	4.8	× 1608 / 11023	0.7
8	19,355	2585.0	− 2586	−1	× 1585 / 11023	−0.1
11	19,358	2617.2	− 2628	−10.8	× 1623 / 11023	−1.6
Sum, rounded to a whole point						2

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	19,642	2456.9	− 2436	20.9	× 1469 / 11074	2.8
4	19,643	2490.3	− 2485	5.3	× 1592 / 11074	0.8
5	19,646	2516.3	− 2528	−11.7	× 1586 / 11074	−1.7
6	19,648	2560.9	− 2552	8.9	× 1611 / 11074	1.3
7	19,650	2576.1	− 2567	9.1	× 1561 / 11074	1.3
8	19,652	2599.2	− 2586	13.2	× 1610 / 11074	1.9
11	19,653	2619.0	− 2628	−9	× 1645 / 11074	−1.3
Sum, rounded to a whole point						5

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	19,637	2460.2	− 2436	24.2	× 1409 / 10711	3.2
4	19,639	2491.0	− 2485	6	× 1468 / 10711	0.8
5	19,641	2511.9	− 2528	−16.1	× 1576 / 10711	−2.4
6	19,643	2558.4	− 2552	6.4	× 1610 / 10711	1
7	19,645	2575.8	− 2567	8.8	× 1593 / 10711	1.3
8	19,647	2607.6	− 2586	21.6	× 1563 / 10711	3.2
11	19,649	2621.6	− 2628	−6.4	× 1492 / 10711	−0.9
Sum, rounded to a whole point						6

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	19,823	2460.9	− 2436	24.9	× 1471 / 10803	3.4
4	19,824	2495.5	− 2485	10.5	× 1448 / 10803	1.4
5	19,825	2520.6	− 2528	−7.4	× 1475 / 10803	−1
6	19,826	2558.4	− 2552	6.4	× 1612 / 10803	1
7	19,827	2575.0	− 2567	8	× 1644 / 10803	1.2
8	19,828	2607.6	− 2586	21.6	× 1585 / 10803	3.2
11	19,829	2622.0	− 2628	−6	× 1568 / 10803	−0.9
Sum, rounded to a whole point						8

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	19,317	2619.8	− 2552	67.8	× 415 / 520	54.1
7	19,318	2683.0	− 2567	116	× 54 / 520	12
8	19,319	2685.3	− 2586	99.3	× 51 / 520	9.7
Sum, rounded to a whole point						76

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	19,860	2451.8	− 2436	15.8	× 1319 / 9860	2.1
4	19,861	2485.0	− 2485	0	× 1376 / 9860	0
5	19,862	2512.5	− 2528	−15.5	× 1372 / 9860	−2.2
6	19,863	2554.8	− 2552	2.8	× 1440 / 9860	0.4
7	19,864	2549.3	− 2567	−17.7	× 1394 / 9860	−2.5
8	19,865	2577.1	− 2586	−8.9	× 1466 / 9860	−1.3
11	19,866	2614.4	− 2628	−13.6	× 1493 / 9860	−2.1
Sum, rounded to a whole point						−6

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	19,819	2456.3	− 2436	20.3	× 1259 / 9630	2.7
4	19,820	2503.2	− 2485	18.2	× 1330 / 9630	2.5
5	19,821	2523.0	− 2528	−5	× 1387 / 9630	−0.7
6	19,822	2544.4	− 2552	−7.6	× 1386 / 9630	−1.1
7	19,823	2564.4	− 2567	−2.6	× 1402 / 9630	−0.4
8	19,824	2567.7	− 2586	−18.3	× 1377 / 9630	−2.6
11	19,825	2619.6	− 2628	−8.4	× 1489 / 9630	−1.3
Sum, rounded to a whole point						−1

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	19,749	2457.3	− 2436	21.3	× 1220 / 9524	2.7
4	19,750	2499.1	− 2485	14.1	× 1253 / 9524	1.9
5	19,751	2524.7	− 2528	−3.3	× 1349 / 9524	−0.5
6	19,752	2549.0	− 2552	−3	× 1415 / 9524	−0.4
7	19,753	2565.4	− 2567	−1.6	× 1344 / 9524	−0.2
8	19,754	2587.6	− 2586	1.6	× 1438 / 9524	0.2
11	19,755	2608.3	− 2628	−19.7	× 1505 / 9524	−3.1
Sum, rounded to a whole point						1

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	19,700	2459.5	− 2436	23.5	× 1200 / 9143	3.1
4	19,701	2500.6	− 2485	15.6	× 1241 / 9143	2.1
5	19,702	2527.5	− 2528	−0.5	× 1275 / 9143	−0.1
6	19,703	2555.7	− 2552	3.7	× 1376 / 9143	0.6
7	19,704	2565.7	− 2567	−1.3	× 1345 / 9143	−0.2
8	19,705	2586.1	− 2586	0.1	× 1324 / 9143	0
11	19,706	2619.2	− 2628	−8.8	× 1382 / 9143	−1.3
Sum, rounded to a whole point						4

2026 from sb_ca2026_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	19,774	2454.8	− 2436	18.8	× 1170 / 8909	2.5
4	19,775	2499.3	− 2485	14.3	× 1199 / 8909	1.9
5	19,776	2522.5	− 2528	−5.5	× 1254 / 8909	−0.8
6	19,777	2552.6	− 2552	0.6	× 1293 / 8909	0.1
7	19,778	2585.9	− 2567	18.9	× 1345 / 8909	2.9
8	19,779	2592.8	− 2586	6.8	× 1347 / 8909	1
11	19,780	2612.8	− 2628	−15.2	× 1301 / 8909	−2.2
Sum, rounded to a whole point						5

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −9, 2, 5, 6, 8, 76, −6, −1, 1, 4, 5 → 8.3
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 11 · 2016→2017: 3 · 2017→2018: 1 · 2018→2019: 2 · 2019→2021: 68 · 2021→2022: 82 · 2022→2023: 5 · 2023→2024: 2 · 2024→2025: 3 · 2025→2026: 1 → average 17.8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 17.8 × 2.66 = 47.3. Upper limit 55.6, lower limit −39.

Why 2.66? It is the standard factor from quality control, the work of Walter Shewhart and W. Edwards Deming. It turns "how much the result typically changes in a year" into "how far it can wander by chance alone".

Years with no result (no state tests were given in spring 2020) are skipped: the year-to-year change runs from the last year with a result to the next one.

Step 3 · Free or reduced-price meals

The share of enrolled students eligible for free or reduced-price meals — for a district, the total across its schools. From 2014–15, 2015–16, 2016–17, 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.

ABC Unified