Museum: english · Schoolio

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	75,168	2455.0	− 2432	23	× 25 / 152	3.8
4	75,171	2483.4	− 2473	10.4	× 24 / 152	1.6
5	75,172	2540.0	− 2502	38	× 26 / 152	6.5
6	75,175	2572.5	− 2531	41.5	× 26 / 152	7.1
7	75,176	2552.9	− 2552	0.9	× 24 / 152	0.1
8	75,179	2592.9	− 2567	25.9	× 27 / 152	4.6
Sum, rounded to a whole point						24

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	69,872	2447.0	− 2432	15	× 26 / 148	2.6
4	69,875	2495.8	− 2473	22.8	× 25 / 148	3.9
5	69,876	2509.9	− 2502	7.9	× 24 / 148	1.3
6	69,878	2560.5	− 2531	29.5	× 26 / 148	5.2
7	69,880	2599.5	− 2552	47.5	× 25 / 148	8
8	69,882	2567.1	− 2567	0.1	× 22 / 148	0
Sum, rounded to a whole point						21

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	71,708	2461.6	− 2432	29.6	× 25 / 149	5
4	71,710	2496.5	− 2473	23.5	× 26 / 149	4.1
5	71,712	2553.2	− 2502	51.2	× 27 / 149	9.3
6	71,714	2552.3	− 2531	21.3	× 24 / 149	3.4
7	71,716	2605.3	− 2552	53.3	× 23 / 149	8.2
8	71,717	2632.0	− 2567	65	× 24 / 149	10.5
Sum, rounded to a whole point						40

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	71,853	2487.4	− 2432	55.4	× 25 / 149	9.3
4	71,855	2512.0	− 2473	39	× 27 / 149	7.1
5	71,857	2522.1	− 2502	20.1	× 24 / 149	3.2
6	71,859	2566.5	− 2531	35.5	× 26 / 149	6.2
7	71,861	2575.5	− 2552	23.5	× 26 / 149	4.1
8	71,863	2623.4	− 2567	56.4	× 21 / 149	7.9
Sum, rounded to a whole point						38

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	72,334	2406.9	− 2432	−25.1	× 24 / 158	−3.8
4	72,335	2529.3	− 2473	56.3	× 28 / 158	10
5	72,336	2546.9	− 2502	44.9	× 27 / 158	7.7
6	72,337	2536.0	− 2531	5	× 28 / 158	0.9
7	72,338	2587.9	− 2552	35.9	× 27 / 158	6.1
8	72,339	2594.3	− 2567	27.3	× 24 / 158	4.1
Sum, rounded to a whole point						25

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	70,819	2458.9	− 2432	26.9	× 22 / 139	4.3
4	70,820	2529.1	− 2473	56.1	× 24 / 139	9.7
5	70,821	2490.6	− 2502	−11.4	× 22 / 139	−1.8
6	70,822	2566.2	− 2531	35.2	× 23 / 139	5.8
7	70,823	2592.0	− 2552	40	× 26 / 139	7.5
8	70,824	2587.5	− 2567	20.5	× 22 / 139	3.2
Sum, rounded to a whole point						29

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	72,424	2454.7	− 2432	22.7	× 24 / 140	3.9
4	72,425	2518.5	− 2473	45.5	× 26 / 140	8.5
5	72,426	2595.0	− 2502	93	× 26 / 140	17.3
6	72,427	2477.3	− 2531	−53.7	× 19 / 140	−7.3
7	72,428	2574.2	− 2552	22.2	× 24 / 140	3.8
8	72,429	2567.1	− 2567	0.1	× 21 / 140	0
Sum, rounded to a whole point						26

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	72,418	2492.3	− 2432	60.3	× 27 / 150	10.9
4	72,419	2500.6	− 2473	27.6	× 28 / 150	5.2
5	72,420	2556.5	− 2502	54.5	× 25 / 150	9.1
6	72,421	2544.4	− 2531	13.4	× 25 / 150	2.2
7	72,422	2541.2	− 2552	−10.8	× 23 / 150	−1.7
8	72,423	2614.7	− 2567	47.7	× 22 / 150	7
Sum, rounded to a whole point						33

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	72,400	2429.7	− 2432	−2.3	× 26 / 136	−0.4
4	72,401	2481.8	− 2473	8.8	× 23 / 136	1.5
5	72,402	2517.9	− 2502	15.9	× 25 / 136	2.9
6	72,403	2530.9	− 2531	−0.1	× 28 / 136	0
7	72,404	2573.5	− 2552	21.5	× 19 / 136	3
8	72,405	2587.7	− 2567	20.7	× 15 / 136	2.3
Sum, rounded to a whole point						9

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	72,116	2453.8	− 2432	21.8	× 19 / 144	2.9
4	72,117	2487.2	− 2473	14.2	× 29 / 144	2.9
5	72,118	2519.9	− 2502	17.9	× 27 / 144	3.4
6	72,119	2555.9	− 2531	24.9	× 24 / 144	4.2
7	72,120	2558.3	− 2552	6.3	× 25 / 144	1.1
8	72,121	2584.7	− 2567	17.7	× 20 / 144	2.5
Sum, rounded to a whole point						17

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. 24, 21, 40, 38, 25, 29, 26, 33, 9, 17 → 26.2
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 3 · 2016→2017: 19 · 2017→2018: 2 · 2018→2019: 13 · 2019→2021: 4 · 2021→2022: 3 · 2022→2023: 7 · 2023→2024: 24 · 2024→2025: 8 → average 9.2
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 9.2 × 2.66 = 24.5. Upper limit 50.7, lower limit 1.7.

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.