Orange: english · Schoolio

The shaded band is this county'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	47,703	2419.2	− 2432	−12.8	× 36005 / 254654	−1.8
4	47,704	2464.7	− 2473	−8.3	× 36036 / 254654	−1.2
5	47,707	2506.0	− 2502	4	× 36318 / 254654	0.6
6	47,709	2534.7	− 2531	3.7	× 36740 / 254654	0.5
7	47,710	2554.3	− 2552	2.3	× 36269 / 254654	0.3
8	47,713	2576.0	− 2567	9	× 36958 / 254654	1.3
11	47,715	2615.3	− 2583	32.3	× 36328 / 254654	4.6
Sum, rounded to a whole point						4

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	44,345	2430.0	− 2432	−2	× 34763 / 254550	−0.3
4	44,348	2475.2	− 2473	2.2	× 36129 / 254550	0.3
5	44,350	2516.2	− 2502	14.2	× 36213 / 254550	2
6	44,351	2543.2	− 2531	12.2	× 36600 / 254550	1.8
7	44,353	2565.1	− 2552	13.1	× 36968 / 254550	1.9
8	44,356	2583.1	− 2567	16.1	× 36481 / 254550	2.3
11	44,357	2620.8	− 2583	37.8	× 37396 / 254550	5.6
Sum, rounded to a whole point						14

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	45,436	2430.6	− 2432	−1.4	× 34726 / 255632	−0.2
4	45,439	2474.4	− 2473	1.4	× 34929 / 255632	0.2
5	45,440	2510.2	− 2502	8.2	× 36323 / 255632	1.2
6	45,443	2542.1	− 2531	11.1	× 36585 / 255632	1.6
7	45,444	2565.2	− 2552	13.2	× 36910 / 255632	1.9
8	45,447	2582.3	− 2567	15.3	× 37041 / 255632	2.2
11	45,449	2625.1	− 2583	42.1	× 39118 / 255632	6.4
Sum, rounded to a whole point						13

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	45,451	2439.9	− 2432	7.9	× 32692 / 250976	1
4	45,454	2483.7	− 2473	10.7	× 34875 / 250976	1.5
5	45,455	2518.1	− 2502	16.1	× 35049 / 250976	2.2
6	45,458	2543.9	− 2531	12.9	× 36408 / 250976	1.9
7	45,459	2566.6	− 2552	14.6	× 36809 / 250976	2.1
8	45,462	2580.3	− 2567	13.3	× 37052 / 250976	2
11	45,463	2613.4	− 2583	30.4	× 38091 / 250976	4.6
Sum, rounded to a whole point						15

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	45,586	2441.6	− 2432	9.6	× 32551 / 245874	1.3
4	45,587	2485.7	− 2473	12.7	× 32751 / 245874	1.7
5	45,588	2524.4	− 2502	22.4	× 34801 / 245874	3.2
6	45,589	2548.6	− 2531	17.6	× 35159 / 245874	2.5
7	45,590	2570.8	− 2552	18.8	× 36568 / 245874	2.8
8	45,591	2583.7	− 2567	16.7	× 36783 / 245874	2.5
11	45,592	2619.1	− 2583	36.1	× 37261 / 245874	5.5
Sum, rounded to a whole point						19

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	44,221	2389.5	− 2432	−42.5	× 823 / 44037	−0.8
4	44,222	2445.4	− 2473	−27.6	× 842 / 44037	−0.5
5	44,223	2487.9	− 2502	−14.1	× 860 / 44037	−0.3
6	44,224	2488.2	− 2531	−42.8	× 513 / 44037	−0.5
7	44,225	2552.8	− 2552	0.8	× 5448 / 44037	0.1
8	44,226	2557.7	− 2567	−9.3	× 5509 / 44037	−1.2
11	44,227	2629.9	− 2583	46.9	× 30042 / 44037	32
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	45,276	2431.8	− 2432	−0.2	× 29955 / 227032	0
4	45,277	2481.5	− 2473	8.5	× 31100 / 227032	1.2
5	45,278	2517.7	− 2502	15.7	× 31348 / 227032	2.2
6	45,279	2542.0	− 2531	11	× 32146 / 227032	1.6
7	45,280	2568.1	− 2552	16.1	× 32240 / 227032	2.3
8	45,281	2577.7	− 2567	10.7	× 34392 / 227032	1.6
11	45,282	2618.5	− 2583	35.5	× 35851 / 227032	5.6
Sum, rounded to a whole point						14

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	45,238	2435.3	− 2432	3.3	× 29500 / 222066	0.4
4	45,239	2480.7	− 2473	7.7	× 30068 / 222066	1
5	45,240	2520.1	− 2502	18.1	× 30961 / 222066	2.5
6	45,241	2541.0	− 2531	10	× 31288 / 222066	1.4
7	45,242	2566.3	− 2552	14.3	× 32100 / 222066	2.1
8	45,243	2575.3	− 2567	8.3	× 32401 / 222066	1.2
11	45,244	2618.3	− 2583	35.3	× 35748 / 222066	5.7
Sum, rounded to a whole point						14

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	45,083	2434.2	− 2432	2.2	× 28817 / 219261	0.3
4	45,084	2480.1	− 2473	7.1	× 29843 / 219261	1
5	45,085	2520.1	− 2502	18.1	× 30428 / 219261	2.5
6	45,086	2546.9	− 2531	15.9	× 31208 / 219261	2.3
7	45,087	2565.1	− 2552	13.1	× 31504 / 219261	1.9
8	45,088	2576.5	− 2567	9.5	× 32302 / 219261	1.4
11	45,089	2615.7	− 2583	32.7	× 35159 / 219261	5.2
Sum, rounded to a whole point						15

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	44,825	2437.3	− 2432	5.3	× 28315 / 216851	0.7
4	44,826	2485.1	− 2473	12.1	× 29141 / 216851	1.6
5	44,827	2524.9	− 2502	22.9	× 30279 / 216851	3.2
6	44,828	2551.5	− 2531	20.5	× 30669 / 216851	2.9
7	44,829	2573.0	− 2552	21	× 31548 / 216851	3.1
8	44,830	2580.6	− 2567	13.6	× 31929 / 216851	2
11	44,831	2616.0	− 2583	33	× 34970 / 216851	5.3
Sum, rounded to a whole point						19

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. 4, 14, 13, 15, 19, 29, 14, 14, 15, 19 → 15.6
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 10 · 2016→2017: 1 · 2017→2018: 2 · 2018→2019: 4 · 2019→2021: 10 · 2021→2022: 15 · 2022→2023: 0 · 2023→2024: 1 · 2024→2025: 4 → average 5.2
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 5.2 × 2.66 = 13.8. Upper limit 29.4, lower limit 1.8.

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 — for a county, the total across its schools. From 2014–15, 2015–16, 2016–17, 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.