Del Roble Elementary: english

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	88,376	2393.3	− 2432	−38.7	× 72 / 265	−10.5
4	88,377	2439.8	− 2473	−33.2	× 68 / 265	−8.5
5	88,380	2474.1	− 2502	−27.9	× 59 / 265	−6.2
6	88,381	2501.8	− 2531	−29.2	× 66 / 265	−7.3
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	82,048	2420.3	− 2432	−11.7	× 54 / 244	−2.6
4	82,050	2446.6	− 2473	−26.4	× 66 / 244	−7.1
5	82,051	2465.7	− 2502	−36.3	× 68 / 244	−10.1
6	82,054	2527.3	− 2531	−3.7	× 56 / 244	−0.8
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	84,333	2380.6	− 2432	−51.4	× 62 / 241	−13.2
4	84,335	2443.8	− 2473	−29.2	× 55 / 241	−6.7
5	84,337	2460.7	− 2502	−41.3	× 59 / 241	−10.1
6	84,339	2499.4	− 2531	−31.6	× 65 / 241	−8.5
Sum, rounded to a whole point						−39

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	84,552	2424.0	− 2432	−8	× 47 / 214	−1.8
4	84,554	2404.1	− 2473	−68.9	× 60 / 214	−19.3
5	84,556	2460.4	− 2502	−41.6	× 47 / 214	−9.1
6	84,558	2520.1	− 2531	−10.9	× 60 / 214	−3.1
Sum, rounded to a whole point						−33

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	85,143	2394.9	− 2432	−37.1	× 85 / 228	−13.8
4	85,144	2455.0	− 2473	−18	× 40 / 228	−3.2
5	85,145	2433.5	− 2502	−68.5	× 53 / 228	−15.9
6	85,146	2510.3	− 2531	−20.7	× 50 / 228	−4.5
Sum, rounded to a whole point						−37

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	85,336	2415.9	− 2432	−16.1	× 72 / 277	−4.2
4	85,337	2471.7	− 2473	−1.3	× 66 / 277	−0.3
5	85,338	2513.3	− 2502	11.3	× 67 / 277	2.7
6	85,339	2487.0	− 2531	−44	× 72 / 277	−11.4
Sum, rounded to a whole point						−13

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	85,273	2395.6	− 2432	−36.4	× 54 / 265	−7.4
4	85,274	2454.7	− 2473	−18.3	× 68 / 265	−4.7
5	85,275	2527.6	− 2502	25.6	× 66 / 265	6.4
6	85,276	2517.5	− 2531	−13.5	× 61 / 265	−3.1
7	85,277	2536.9	− 2552	−15.1	× 16 / 265	−0.9
Sum, rounded to a whole point						−10

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	85,260	2392.2	− 2432	−39.8	× 57 / 267	−8.5
4	85,261	2429.6	− 2473	−43.4	× 56 / 267	−9.1
5	85,262	2511.4	− 2502	9.4	× 65 / 267	2.3
6	85,263	2529.4	− 2531	−1.6	× 65 / 267	−0.4
7	85,264	2504.2	− 2552	−47.8	× 13 / 267	−2.3
8	85,265	2568.2	− 2567	1.2	× 11 / 267	0
Sum, rounded to a whole point						−18

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	84,952	2387.2	− 2432	−44.8	× 55 / 225	−11
4	84,953	2461.6	− 2473	−11.4	× 49 / 225	−2.5
5	84,954	2469.5	− 2502	−32.5	× 55 / 225	−7.9
6	84,955	2528.9	− 2531	−2.1	× 66 / 225	−0.6
Sum, rounded to a whole point						−22

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −33, −21, −39, −33, −37, −13, −10, −18, −22 → −25.1
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 12 · 2016→2017: 18 · 2017→2018: 6 · 2018→2019: 4 · 2019→2022: 24 · 2022→2023: 3 · 2023→2024: 8 · 2024→2025: 4 → average 9.9
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 9.9 × 2.66 = 26.3. Upper limit 1.2, lower limit −51.4.

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. From 2014–15, 2015–16, 2016–17, 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.