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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
3	35,764	2413.6	− 2432	−18.4	× 112 / 642	−3.2
4	35,765	2467.9	− 2473	−5.1	× 113 / 642	−0.9
5	35,768	2509.8	− 2502	7.8	× 106 / 642	1.3
6	35,769	2483.5	− 2531	−47.5	× 109 / 642	−8.1
7	35,772	2573.0	− 2552	21	× 89 / 642	2.9
8	35,773	2579.8	− 2567	12.8	× 113 / 642	2.3
Sum, rounded to a whole point						−6

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	33,417	2414.0	− 2432	−18	× 116 / 633	−3.3
4	33,418	2477.7	− 2473	4.7	× 107 / 633	0.8
5	33,421	2505.4	− 2502	3.4	× 108 / 633	0.6
6	33,422	2514.9	− 2531	−16.1	× 116 / 633	−3
7	33,425	2525.3	− 2552	−26.7	× 96 / 633	−4
8	33,426	2604.3	− 2567	37.3	× 90 / 633	5.3
Sum, rounded to a whole point						−4

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	34,007	2408.8	− 2432	−23.2	× 105 / 615	−4
4	34,010	2484.2	− 2473	11.2	× 114 / 615	2.1
5	34,012	2486.0	− 2502	−16	× 103 / 615	−2.7
6	34,013	2532.0	− 2531	1	× 105 / 615	0.2
7	34,016	2546.6	− 2552	−5.4	× 93 / 615	−0.8
8	34,017	2562.2	− 2567	−4.8	× 95 / 615	−0.7
Sum, rounded to a whole point						−6

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	34,012	2433.6	− 2432	1.6	× 104 / 611	0.3
4	34,014	2490.3	− 2473	17.3	× 105 / 611	3
5	34,016	2502.8	− 2502	0.8	× 113 / 611	0.1
6	34,018	2527.3	− 2531	−3.7	× 97 / 611	−0.6
7	34,020	2540.1	− 2552	−11.9	× 100 / 611	−1.9
8	34,022	2577.0	− 2567	10	× 92 / 611	1.5
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
3	34,189	2426.5	− 2432	−5.5	× 109 / 604	−1
4	34,190	2489.4	− 2473	16.4	× 100 / 604	2.7
5	34,191	2505.7	− 2502	3.7	× 102 / 604	0.6
6	34,192	2535.3	− 2531	4.3	× 102 / 604	0.7
7	34,193	2586.2	− 2552	34.2	× 96 / 604	5.4
8	34,194	2567.9	− 2567	0.9	× 95 / 604	0.1
Sum, rounded to a whole point						9

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	34,102	2450.0	− 2432	18	× 95 / 584	2.9
4	34,103	2478.4	− 2473	5.4	× 105 / 584	1
5	34,104	2483.5	− 2502	−18.5	× 97 / 584	−3.1
6	34,105	2484.2	− 2531	−46.8	× 111 / 584	−8.9
7	34,106	2596.0	− 2552	44	× 86 / 584	6.5
8	34,107	2580.6	− 2567	13.6	× 90 / 584	2.1
Sum, rounded to a whole point						1

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	34,153	2422.7	− 2432	−9.3	× 103 / 617	−1.6
4	34,154	2491.2	− 2473	18.2	× 97 / 617	2.9
5	34,155	2489.8	− 2502	−12.2	× 106 / 617	−2.1
6	34,156	2484.6	− 2531	−46.4	× 125 / 617	−9.4
7	34,157	2568.0	− 2552	16	× 101 / 617	2.6
8	34,158	2596.5	− 2567	29.5	× 85 / 617	4.1
Sum, rounded to a whole point						−4

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	34,009	2434.6	− 2432	2.6	× 114 / 665	0.4
4	34,010	2475.2	− 2473	2.2	× 105 / 665	0.3
5	34,011	2505.2	− 2502	3.2	× 100 / 665	0.5
6	34,012	2515.8	− 2531	−15.2	× 124 / 665	−2.8
7	34,013	2544.6	− 2552	−7.4	× 121 / 665	−1.3
8	34,014	2555.2	− 2567	−11.8	× 101 / 665	−1.8
Sum, rounded to a whole point						−5

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	33,872	2416.1	− 2432	−15.9	× 112 / 667	−2.7
4	33,873	2488.9	− 2473	15.9	× 110 / 667	2.6
5	33,874	2515.0	− 2502	13	× 102 / 667	2
6	33,875	2501.3	− 2531	−29.7	× 114 / 667	−5.1
7	33,876	2583.5	− 2552	31.5	× 113 / 667	5.3
8	33,877	2542.4	− 2567	−24.6	× 116 / 667	−4.3
Sum, rounded to a whole point						−2

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −6, −4, −6, 2, 9, 1, −4, −5, −2 → −1.7
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 2 · 2016→2017: 2 · 2017→2018: 8 · 2018→2019: 7 · 2019→2022: 8 · 2022→2023: 5 · 2023→2024: 1 · 2024→2025: 3 → average 4.5
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 4.5 × 2.66 = 12. Upper limit 10.3, lower limit −13.7.

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.