Oakland School For The Arts: math

The shaded band is this school'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
6	2,683	2521.6	− 2552	−30.4	× 102 / 381	−8.1
7	2,685	2596.2	− 2567	29.2	× 101 / 381	7.7
8	2,687	2566.6	− 2586	−19.4	× 102 / 381	−5.2
11	2,689	2604.1	− 2628	−23.9	× 76 / 381	−4.8
Sum, rounded to a whole point						−10

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	2,387	2560.7	− 2552	8.7	× 97 / 405	2.1
7	2,389	2582.7	− 2567	15.7	× 107 / 405	4.1
8	2,390	2627.0	− 2586	41	× 106 / 405	10.7
11	2,392	2593.2	− 2628	−34.8	× 95 / 405	−8.2
Sum, rounded to a whole point						9

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	2,459	2555.2	− 2552	3.2	× 102 / 408	0.8
7	2,460	2595.9	− 2567	28.9	× 102 / 408	7.2
8	2,463	2558.6	− 2586	−27.4	× 108 / 408	−7.3
11	2,464	2554.3	− 2628	−73.7	× 96 / 408	−17.3
Sum, rounded to a whole point						−17

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	2,462	2564.4	− 2552	12.4	× 88 / 402	2.7
7	2,464	2563.7	− 2567	−3.3	× 107 / 402	−0.9
8	2,466	2609.3	− 2586	23.3	× 101 / 402	5.9
11	2,468	2590.1	− 2628	−37.9	× 106 / 402	−10
Sum, rounded to a whole point						−2

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	2,485	2552.4	− 2552	0.4	× 89 / 386	0.1
7	2,486	2596.3	− 2567	29.3	× 92 / 386	7
8	2,487	2599.9	− 2586	13.9	× 108 / 386	3.9
11	2,488	2604.1	− 2628	−23.9	× 97 / 386	−6
Sum, rounded to a whole point						5

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	2,399	2487.1	− 2552	−64.9	× 118 / 431	−17.8
7	2,400	2557.4	− 2567	−9.6	× 106 / 431	−2.4
8	2,401	2539.4	− 2586	−46.6	× 111 / 431	−12
11	2,402	2583.0	− 2628	−45	× 96 / 431	−10
Sum, rounded to a whole point						−42

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	2,353	2500.5	− 2552	−51.5	× 113 / 407	−14.3
7	2,354	2496.4	− 2567	−70.6	× 112 / 407	−19.4
8	2,355	2560.5	− 2586	−25.5	× 99 / 407	−6.2
11	2,356	2613.0	− 2628	−15	× 83 / 407	−3.1
Sum, rounded to a whole point						−43

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	2,317	2475.5	− 2552	−76.5	× 108 / 431	−19.2
7	2,318	2525.4	− 2567	−41.6	× 111 / 431	−10.7
8	2,319	2513.4	− 2586	−72.6	× 112 / 431	−18.9
11	2,320	2598.1	− 2628	−29.9	× 100 / 431	−6.9
Sum, rounded to a whole point						−56

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	2,293	2505.1	− 2552	−46.9	× 113 / 441	−12
7	2,294	2504.7	− 2567	−62.3	× 113 / 441	−16
8	2,295	2535.7	− 2586	−50.3	× 113 / 441	−12.9
11	2,296	2583.6	− 2628	−44.4	× 102 / 441	−10.3
Sum, rounded to a whole point						−51

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −10, 9, −17, −2, 5, −42, −43, −56, −51 → −23
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 19 · 2016→2017: 26 · 2017→2018: 15 · 2018→2019: 7 · 2019→2022: 47 · 2022→2023: 1 · 2023→2024: 13 · 2024→2025: 5 → average 16.6
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 16.6 × 2.66 = 44.2. Upper limit 21.2, lower limit −67.2.

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. From 2014–15, 2015–16, 2016–17, 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.