Roberts Ferry Union Elementary: 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	97,441	2411.5	− 2432	−20.5	× 13 / 60	−4.4
5	97,444	2539.9	− 2502	37.9	× 12 / 60	7.6
6	97,447	2475.9	− 2531	−55.1	× 19 / 60	−17.4
8	97,451	2534.3	− 2567	−32.7	× 16 / 60	−8.7
Sum, rounded to a whole point						−23

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	90,339	2432.2	− 2432	0.2	× 13 / 88	0
4	90,341	2455.1	− 2473	−17.9	× 17 / 88	−3.5
5	90,342	2515.5	− 2502	13.5	× 11 / 88	1.7
6	90,344	2494.3	− 2531	−36.7	× 19 / 88	−7.9
7	90,346	2544.7	− 2552	−7.3	× 15 / 88	−1.2
8	90,348	2538.7	− 2567	−28.3	× 13 / 88	−4.2
Sum, rounded to a whole point						−15

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	92,991	2419.5	− 2432	−12.5	× 11 / 87	−1.6
4	92,992	2508.4	− 2473	35.4	× 16 / 87	6.5
5	92,994	2518.1	− 2502	16.1	× 20 / 87	3.7
6	92,997	2533.7	− 2531	2.7	× 11 / 87	0.3
7	92,998	2526.5	− 2552	−25.5	× 18 / 87	−5.3
8	93,001	2555.8	− 2567	−11.2	× 11 / 87	−1.4
Sum, rounded to a whole point						2

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	93,193	2443.0	− 2432	11	× 21 / 87	2.7
5	93,197	2513.2	− 2502	11.2	× 14 / 87	1.8
6	93,200	2529.1	− 2531	−1.9	× 23 / 87	−0.5
7	93,201	2565.6	− 2552	13.6	× 12 / 87	1.9
8	93,204	2566.9	− 2567	−0.1	× 17 / 87	0
Sum, rounded to a whole point						6

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,859	2409.8	− 2432	−22.2	× 15 / 99	−3.4
4	91,860	2478.9	− 2473	5.9	× 15 / 99	0.9
5	91,861	2507.1	− 2502	5.1	× 17 / 99	0.9
6	91,862	2537.3	− 2531	6.3	× 23 / 99	1.5
7	91,863	2551.4	− 2552	−0.6	× 16 / 99	−0.1
8	91,864	2595.8	− 2567	28.8	× 13 / 99	3.8
Sum, rounded to a whole point						4

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	94,079	2428.8	− 2432	−3.2	× 20 / 97	−0.7
4	94,080	2436.7	− 2473	−36.3	× 20 / 97	−7.5
5	94,081	2532.0	− 2502	30	× 13 / 97	4
6	94,082	2521.4	− 2531	−9.6	× 18 / 97	−1.8
7	94,083	2598.6	− 2552	46.6	× 15 / 97	7.2
8	94,084	2533.8	− 2567	−33.2	× 11 / 97	−3.8
Sum, rounded to a whole point						−2

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	93,985	2388.4	− 2432	−43.6	× 23 / 102	−9.8
4	93,986	2504.3	− 2473	31.3	× 23 / 102	7.1
5	93,987	2522.9	− 2502	20.9	× 20 / 102	4.1
6	93,988	2510.1	− 2531	−20.9	× 14 / 102	−2.9
7	93,989	2528.5	− 2552	−23.5	× 22 / 102	−5.1
Sum, rounded to a whole point						−7

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	93,870	2395.1	− 2432	−36.9	× 27 / 127	−7.8
4	93,871	2502.3	− 2473	29.3	× 23 / 127	5.3
5	93,872	2542.4	− 2502	40.4	× 27 / 127	8.6
6	93,873	2550.2	− 2531	19.2	× 18 / 127	2.7
7	93,874	2583.8	− 2552	31.8	× 12 / 127	3
8	93,875	2535.9	− 2567	−31.1	× 20 / 127	−4.9
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	93,598	2436.0	− 2432	4	× 26 / 126	0.8
4	93,599	2499.7	− 2473	26.7	× 25 / 126	5.3
5	93,600	2528.8	− 2502	26.8	× 21 / 126	4.5
6	93,601	2556.0	− 2531	25	× 24 / 126	4.8
7	93,602	2555.5	− 2552	3.5	× 17 / 126	0.5
8	93,603	2604.6	− 2567	37.6	× 13 / 126	3.9
Sum, rounded to a whole point						20

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −23, −15, 2, 6, 4, −2, −7, 7, 20 → −0.9
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 8 · 2016→2017: 17 · 2017→2018: 4 · 2018→2021: 2 · 2021→2022: 6 · 2022→2023: 5 · 2023→2024: 14 · 2024→2025: 13 → average 8.6
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 8.6 × 2.66 = 22.9. Upper limit 22, lower limit −23.8.

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 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.