Trinity: 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	99,683	2418.5	− 2432	−13.5	× 113 / 809	−1.9
4	99,684	2445.2	− 2473	−27.8	× 146 / 809	−5
5	99,687	2481.9	− 2502	−20.1	× 104 / 809	−2.6
6	99,688	2512.5	− 2531	−18.5	× 126 / 809	−2.9
7	99,691	2544.6	− 2552	−7.4	× 116 / 809	−1.1
8	99,692	2546.0	− 2567	−21	× 119 / 809	−3.1
11	99,695	2535.8	− 2583	−47.2	× 85 / 809	−5
Sum, rounded to a whole point						−21

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	92,444	2426.5	− 2432	−5.5	× 117 / 842	−0.8
4	92,446	2456.8	− 2473	−16.2	× 115 / 842	−2.2
5	92,449	2490.8	− 2502	−11.2	× 148 / 842	−2
6	92,451	2538.3	− 2531	7.3	× 103 / 842	0.9
7	92,453	2549.5	− 2552	−2.5	× 135 / 842	−0.4
8	92,455	2576.7	− 2567	9.7	× 120 / 842	1.4
11	92,457	2589.4	− 2583	6.4	× 104 / 842	0.8
Sum, rounded to a whole point						−2

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	95,237	2424.9	− 2432	−7.1	× 105 / 834	−0.9
4	95,238	2460.9	− 2473	−12.1	× 110 / 834	−1.6
5	95,240	2485.5	− 2502	−16.5	× 114 / 834	−2.3
6	95,243	2538.2	− 2531	7.2	× 147 / 834	1.3
7	95,245	2556.8	− 2552	4.8	× 110 / 834	0.6
8	95,246	2572.5	− 2567	5.5	× 121 / 834	0.8
11	95,248	2552.3	− 2583	−30.7	× 127 / 834	−4.7
Sum, rounded to a whole point						−7

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	95,402	2414.5	− 2432	−17.5	× 94 / 808	−2
4	95,405	2441.7	− 2473	−31.3	× 109 / 808	−4.2
5	95,407	2500.1	− 2502	−1.9	× 106 / 808	−0.2
6	95,409	2530.9	− 2531	−0.1	× 115 / 808	0
7	95,411	2552.6	− 2552	0.6	× 147 / 808	0.1
8	95,412	2562.1	− 2567	−4.9	× 114 / 808	−0.7
11	95,414	2558.3	− 2583	−24.7	× 123 / 808	−3.8
Sum, rounded to a whole point						−11

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	96,059	2434.2	− 2432	2.2	× 103 / 766	0.3
4	96,060	2466.7	− 2473	−6.3	× 96 / 766	−0.8
5	96,061	2501.4	− 2502	−0.6	× 101 / 766	−0.1
6	96,062	2543.6	− 2531	12.6	× 117 / 766	1.9
7	96,063	2571.1	− 2552	19.1	× 115 / 766	2.9
8	96,064	2574.9	− 2567	7.9	× 139 / 766	1.4
11	96,065	2570.6	− 2583	−12.4	× 95 / 766	−1.5
Sum, rounded to a whole point						4

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	93,952	2411.1	− 2432	−20.9	× 108 / 682	−3.3
4	93,953	2437.5	− 2473	−35.5	× 107 / 682	−5.6
5	93,954	2514.9	− 2502	12.9	× 106 / 682	2
6	93,955	2540.5	− 2531	9.5	× 95 / 682	1.3
7	93,956	2578.9	− 2552	26.9	× 72 / 682	2.8
8	93,957	2592.7	− 2567	25.7	× 103 / 682	3.9
11	93,958	2584.5	− 2583	1.5	× 91 / 682	0.2
Sum, rounded to a whole point						1

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	96,215	2437.1	− 2432	5.1	× 99 / 759	0.7
4	96,216	2456.9	− 2473	−16.1	× 108 / 759	−2.3
5	96,217	2500.9	− 2502	−1.1	× 105 / 759	−0.2
6	96,218	2545.2	− 2531	14.2	× 106 / 759	2
7	96,219	2587.2	− 2552	35.2	× 95 / 759	4.4
8	96,220	2578.2	− 2567	11.2	× 105 / 759	1.5
11	96,221	2557.9	− 2583	−25.1	× 141 / 759	−4.7
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	96,082	2416.7	− 2432	−15.3	× 110 / 748	−2.3
4	96,083	2457.5	− 2473	−15.5	× 106 / 748	−2.2
5	96,084	2503.6	− 2502	1.6	× 108 / 748	0.2
6	96,085	2529.6	− 2531	−1.4	× 104 / 748	−0.2
7	96,086	2574.7	− 2552	22.7	× 107 / 748	3.2
8	96,087	2596.2	− 2567	29.2	× 103 / 748	4
11	96,088	2536.2	− 2583	−46.8	× 110 / 748	−6.9
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	95,964	2451.6	− 2432	19.6	× 100 / 778	2.5
4	95,965	2466.1	− 2473	−6.9	× 119 / 778	−1.1
5	95,966	2505.8	− 2502	3.8	× 110 / 778	0.5
6	95,967	2528.2	− 2531	−2.8	× 114 / 778	−0.4
7	95,968	2557.0	− 2552	5	× 101 / 778	0.6
8	95,969	2572.2	− 2567	5.2	× 109 / 778	0.7
11	95,970	2522.1	− 2583	−60.9	× 125 / 778	−9.8
Sum, rounded to a whole point						−7

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	95,700	2420.6	− 2432	−11.4	× 109 / 761	−1.6
4	95,701	2482.6	− 2473	9.6	× 106 / 761	1.3
5	95,702	2528.0	− 2502	26	× 110 / 761	3.8
6	95,703	2531.9	− 2531	0.9	× 107 / 761	0.1
7	95,704	2550.1	− 2552	−1.9	× 105 / 761	−0.3
8	95,705	2585.2	− 2567	18.2	× 98 / 761	2.3
11	95,706	2538.6	− 2583	−44.4	× 126 / 761	−7.4
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. −21, −2, −7, −11, 4, 1, 1, −4, −7, −2 → −4.8
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 19 · 2016→2017: 5 · 2017→2018: 4 · 2018→2019: 15 · 2019→2021: 3 · 2021→2022: 0 · 2022→2023: 5 · 2023→2024: 3 · 2024→2025: 5 → average 6.6
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 6.6 × 2.66 = 17.6. Upper limit 12.8, lower limit −22.4.

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.