River Delta Joint Unified: english

The shaded band is this district'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	61,044	2408.2	− 2432	−23.8	× 129 / 1077	−2.9
4	61,046	2433.9	− 2473	−39.1	× 138 / 1077	−5
5	61,048	2487.1	− 2502	−14.9	× 142 / 1077	−2
6	61,050	2495.3	− 2531	−35.7	× 154 / 1077	−5.1
7	61,052	2485.4	− 2552	−66.6	× 152 / 1077	−9.4
8	61,054	2521.8	− 2567	−45.2	× 195 / 1077	−8.2
11	61,056	2582.3	− 2583	−0.7	× 167 / 1077	−0.1
Sum, rounded to a whole point						−33

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	56,628	2397.9	− 2432	−34.1	× 139 / 1037	−4.6
4	56,629	2438.8	− 2473	−34.2	× 123 / 1037	−4.1
5	56,632	2489.5	− 2502	−12.5	× 125 / 1037	−1.5
6	56,634	2504.0	− 2531	−27	× 133 / 1037	−3.5
7	56,636	2499.3	− 2552	−52.7	× 185 / 1037	−9.4
8	56,638	2501.2	− 2567	−65.8	× 158 / 1037	−10
11	56,640	2591.6	− 2583	8.6	× 174 / 1037	1.4
Sum, rounded to a whole point						−32

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,274	2429.7	− 2432	−2.3	× 105 / 968	−0.2
4	58,277	2433.1	− 2473	−39.9	× 129 / 968	−5.3
5	58,279	2469.1	− 2502	−32.9	× 117 / 968	−4
6	58,281	2498.8	− 2531	−32.2	× 126 / 968	−4.2
7	58,283	2525.0	− 2552	−27	× 177 / 968	−4.9
8	58,285	2521.1	− 2567	−45.9	× 181 / 968	−8.6
11	58,287	2590.9	− 2583	7.9	× 133 / 968	1.1
Sum, rounded to a whole point						−26

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,408	2415.8	− 2432	−16.2	× 129 / 1012	−2.1
4	58,410	2460.1	− 2473	−12.9	× 111 / 1012	−1.4
5	58,412	2481.8	− 2502	−20.2	× 130 / 1012	−2.6
6	58,414	2514.1	− 2531	−16.9	× 124 / 1012	−2.1
7	58,416	2512.8	− 2552	−39.2	× 183 / 1012	−7.1
8	58,418	2536.9	− 2567	−30.1	× 180 / 1012	−5.4
11	58,420	2563.4	− 2583	−19.6	× 155 / 1012	−3
Sum, rounded to a whole point						−24

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,642	2415.3	− 2432	−16.7	× 108 / 1015	−1.8
4	58,643	2458.0	− 2473	−15	× 135 / 1015	−2
5	58,644	2486.5	− 2502	−15.5	× 115 / 1015	−1.8
6	58,645	2523.1	− 2531	−7.9	× 138 / 1015	−1.1
7	58,646	2509.5	− 2552	−42.5	× 171 / 1015	−7.2
8	58,647	2514.2	− 2567	−52.8	× 185 / 1015	−9.6
11	58,648	2567.4	− 2583	−15.6	× 163 / 1015	−2.5
Sum, rounded to a whole point						−26

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,721	2394.4	− 2432	−37.6	× 100 / 907	−4.1
4	58,722	2436.8	− 2473	−36.2	× 99 / 907	−4
5	58,723	2502.2	− 2502	0.2	× 124 / 907	0
6	58,724	2504.8	− 2531	−26.2	× 108 / 907	−3.1
7	58,725	2525.6	− 2552	−26.4	× 161 / 907	−4.7
8	58,726	2536.5	− 2567	−30.5	× 147 / 907	−4.9
11	58,727	2556.0	− 2583	−27	× 168 / 907	−5
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	58,675	2380.1	− 2432	−51.9	× 105 / 869	−6.3
4	58,676	2430.6	− 2473	−42.4	× 102 / 869	−5
5	58,677	2469.0	− 2502	−33	× 102 / 869	−3.9
6	58,678	2505.4	− 2531	−25.6	× 125 / 869	−3.7
7	58,679	2504.2	− 2552	−47.8	× 135 / 869	−7.4
8	58,680	2490.0	− 2567	−77	× 159 / 869	−14.1
11	58,681	2547.6	− 2583	−35.4	× 141 / 869	−5.7
Sum, rounded to a whole point						−46

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,590	2382.0	− 2432	−50	× 104 / 859	−6.1
4	58,591	2402.8	− 2473	−70.2	× 100 / 859	−8.2
5	58,592	2462.7	− 2502	−39.3	× 112 / 859	−5.1
6	58,593	2502.3	− 2531	−28.7	× 105 / 859	−3.5
7	58,594	2495.9	− 2552	−56.1	× 151 / 859	−9.9
8	58,595	2481.4	− 2567	−85.6	× 132 / 859	−13.2
11	58,596	2506.1	− 2583	−76.9	× 155 / 859	−13.9
Sum, rounded to a whole point						−60

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,347	2389.1	− 2432	−42.9	× 129 / 864	−6.4
4	58,348	2431.2	− 2473	−41.8	× 99 / 864	−4.8
5	58,349	2455.9	− 2502	−46.1	× 103 / 864	−5.5
6	58,350	2511.5	− 2531	−19.5	× 111 / 864	−2.5
7	58,351	2504.7	− 2552	−47.3	× 131 / 864	−7.2
8	58,352	2522.0	− 2567	−45	× 152 / 864	−7.9
11	58,353	2548.3	− 2583	−34.7	× 139 / 864	−5.6
Sum, rounded to a whole point						−40

2026 from sb_ca2026_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,272	2390.1	− 2432	−41.9	× 87 / 781	−4.7
4	58,273	2446.3	− 2473	−26.7	× 120 / 781	−4.1
5	58,274	2476.3	− 2502	−25.7	× 89 / 781	−2.9
6	58,275	2498.5	− 2531	−32.5	× 100 / 781	−4.2
7	58,276	2496.4	− 2552	−55.6	× 121 / 781	−8.6
8	58,277	2498.3	− 2567	−68.7	× 127 / 781	−11.2
11	58,278	2559.8	− 2583	−23.2	× 137 / 781	−4.1
Sum, rounded to a whole point						−40

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −33, −32, −26, −24, −26, −26, −46, −60, −40, −40 → −35.3
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 1 · 2016→2017: 6 · 2017→2018: 2 · 2018→2019: 2 · 2019→2022: 0 · 2022→2023: 20 · 2023→2024: 14 · 2024→2025: 20 · 2025→2026: 0 → average 7.2
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 7.2 × 2.66 = 19.2. Upper limit −16.1, lower limit −54.5.

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 — for a district, 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.

River Delta Joint Unified