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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.

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
7	67,175	2504.8	− 2552	−47.2	× 18 / 41	−20.7
8	67,177	2525.1	− 2567	−41.9	× 23 / 41	−23.5
Sum, rounded to a whole point						−44

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
7	67,664	2525.6	− 2552	−26.4	× 19 / 35	−14.3
8	67,665	2489.9	− 2567	−77.1	× 16 / 35	−35.2
Sum, rounded to a whole point						−50

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,806	2372.2	− 2432	−59.8	× 41 / 267	−9.2
4	67,807	2470.7	− 2473	−2.3	× 52 / 267	−0.4
5	67,808	2455.5	− 2502	−46.5	× 42 / 267	−7.3
6	67,809	2466.5	− 2531	−64.5	× 43 / 267	−10.4
7	67,810	2527.8	− 2552	−24.2	× 50 / 267	−4.5
8	67,811	2494.2	− 2567	−72.8	× 39 / 267	−10.6
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
3	67,816	2386.6	− 2432	−45.4	× 12 / 171	−3.2
4	67,817	2475.4	− 2473	2.4	× 22 / 171	0.3
5	67,818	2489.8	− 2502	−12.2	× 26 / 171	−1.9
6	67,819	2559.3	− 2531	28.3	× 24 / 171	4
7	67,820	2495.6	− 2552	−56.4	× 31 / 171	−10.2
8	67,821	2543.8	− 2567	−23.2	× 56 / 171	−7.6
Sum, rounded to a whole point						−19

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,810	2379.1	− 2432	−52.9	× 20 / 146	−7.2
4	67,811	2398.8	− 2473	−74.2	× 11 / 146	−5.6
5	67,812	2422.7	− 2502	−79.3	× 17 / 146	−9.2
6	67,813	2508.5	− 2531	−22.5	× 28 / 146	−4.3
7	67,814	2523.3	− 2552	−28.7	× 33 / 146	−6.5
8	67,815	2565.8	− 2567	−1.2	× 37 / 146	−0.3
Sum, rounded to a whole point						−33

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
4	67,569	2466.7	− 2473	−6.3	× 19 / 96	−1.2
6	67,571	2485.2	− 2531	−45.8	× 17 / 96	−8.1
7	67,572	2526.7	− 2552	−25.3	× 25 / 96	−6.6
8	67,573	2569.3	− 2567	2.3	× 35 / 96	0.8
Sum, rounded to a whole point						−15

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −44, −50, −42, −19, −33, −15 → −33.8
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2018→2019: 6 · 2019→2022: 8 · 2022→2023: 23 · 2023→2024: 14 · 2024→2025: 18 → average 13.8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 13.8 × 2.66 = 36.7. Upper limit 2.9, lower limit −70.5.

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.