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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	14,306	2423.6	− 2432	−8.4	× 17 / 108	−1.3
4	14,309	2465.8	− 2473	−7.2	× 24 / 108	−1.6
5	14,310	2439.3	− 2502	−62.7	× 16 / 108	−9.3
6	14,313	2525.3	− 2531	−5.7	× 21 / 108	−1.1
7	14,314	2568.8	− 2552	16.8	× 14 / 108	2.2
8	14,317	2587.5	− 2567	20.5	× 16 / 108	3
Sum, rounded to a whole point						−8

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	13,329	2483.6	− 2432	51.6	× 23 / 118	10.1
4	13,331	2484.7	− 2473	11.7	× 17 / 118	1.7
5	13,332	2466.8	− 2502	−35.2	× 27 / 118	−8.1
6	13,334	2507.6	− 2531	−23.4	× 19 / 118	−3.8
7	13,337	2559.8	− 2552	7.8	× 16 / 118	1.1
8	13,338	2586.3	− 2567	19.3	× 16 / 118	2.6
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	13,661	2423.7	− 2432	−8.3	× 17 / 129	−1.1
4	13,664	2503.5	− 2473	30.5	× 24 / 129	5.7
5	13,666	2532.1	− 2502	30.1	× 17 / 129	4
6	13,667	2499.5	− 2531	−31.5	× 27 / 129	−6.6
7	13,669	2524.4	− 2552	−27.6	× 26 / 129	−5.6
8	13,671	2533.5	− 2567	−33.5	× 18 / 129	−4.7
Sum, rounded to a whole point						−8

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	13,651	2436.4	− 2432	4.4	× 15 / 122	0.5
4	13,653	2461.2	− 2473	−11.8	× 16 / 122	−1.5
5	13,656	2572.0	− 2502	70	× 24 / 122	13.8
6	13,657	2512.7	− 2531	−18.3	× 16 / 122	−2.4
7	13,659	2542.8	− 2552	−9.2	× 28 / 122	−2.1
8	13,662	2537.3	− 2567	−29.7	× 23 / 122	−5.6
Sum, rounded to a whole point						3

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	13,770	2483.7	− 2432	51.7	× 23 / 119	10
4	13,771	2465.9	− 2473	−7.1	× 15 / 119	−0.9
5	13,772	2510.8	− 2502	8.8	× 16 / 119	1.2
6	13,773	2540.5	− 2531	9.5	× 25 / 119	2
7	13,774	2568.6	− 2552	16.6	× 17 / 119	2.4
8	13,775	2551.0	− 2567	−16	× 23 / 119	−3.1
Sum, rounded to a whole point						12

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	13,462	2426.7	− 2432	−5.3	× 15 / 100	−0.8
4	13,463	2433.0	− 2473	−40	× 16 / 100	−6.4
5	13,464	2559.5	− 2502	57.5	× 18 / 100	10.4
6	13,465	2481.9	− 2531	−49.1	× 15 / 100	−7.4
7	13,466	2555.5	− 2552	3.5	× 15 / 100	0.5
8	13,467	2604.1	− 2567	37.1	× 21 / 100	7.8
Sum, rounded to a whole point						4

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	13,789	2392.4	− 2432	−39.6	× 16 / 111	−5.7
4	13,790	2468.3	− 2473	−4.7	× 23 / 111	−1
5	13,791	2500.5	− 2502	−1.5	× 24 / 111	−0.3
6	13,792	2456.6	− 2531	−74.4	× 12 / 111	−8
7	13,793	2519.2	− 2552	−32.8	× 20 / 111	−5.9
8	13,794	2583.0	− 2567	16	× 16 / 111	2.3
Sum, rounded to a whole point						−19

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	13,764	2422.2	− 2432	−9.8	× 12 / 100	−1.2
4	13,765	2476.6	− 2473	3.6	× 12 / 100	0.4
5	13,766	2517.6	− 2502	15.6	× 22 / 100	3.4
6	13,767	2510.1	− 2531	−20.9	× 20 / 100	−4.2
7	13,768	2556.8	− 2552	4.8	× 18 / 100	0.9
8	13,769	2546.3	− 2567	−20.7	× 16 / 100	−3.3
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	13,729	2433.1	− 2432	1.1	× 14 / 106	0.1
4	13,730	2488.7	− 2473	15.7	× 14 / 106	2.1
5	13,731	2509.9	− 2502	7.9	× 14 / 106	1
6	13,732	2525.9	− 2531	−5.1	× 22 / 106	−1.1
7	13,733	2531.4	− 2552	−20.6	× 20 / 106	−3.9
8	13,734	2562.3	− 2567	−4.7	× 22 / 106	−1
Sum, rounded to a whole point						−3

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	13,683	2424.8	− 2432	−7.2	× 18 / 93	−1.4
4	13,684	2437.2	− 2473	−35.8	× 13 / 93	−5
5	13,685	2498.0	− 2502	−4	× 16 / 93	−0.7
6	13,686	2514.5	− 2531	−16.5	× 13 / 93	−2.3
7	13,687	2533.1	− 2552	−18.9	× 15 / 93	−3
8	13,688	2567.2	− 2567	0.2	× 18 / 93	0
Sum, rounded to a whole point						−12

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −8, 4, −8, 3, 12, 4, −19, −4, −3, −12 → −3.1
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 12 · 2016→2017: 12 · 2017→2018: 11 · 2018→2019: 9 · 2019→2021: 8 · 2021→2022: 23 · 2022→2023: 15 · 2023→2024: 1 · 2024→2025: 9 → average 11.1
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 11.1 × 2.66 = 29.5. Upper limit 26.4, lower limit −32.6.

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.