Oak Grove 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	100,333	2380.7	− 2432	−51.3	× 95 / 277	−17.6
4	100,336	2424.5	− 2473	−48.5	× 89 / 277	−15.6
5	100,337	2449.7	− 2502	−52.3	× 93 / 277	−17.6
Sum, rounded to a whole point						−51

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	93,041	2388.0	− 2432	−44	× 83 / 333	−11
4	93,043	2465.6	− 2473	−7.4	× 78 / 333	−1.7
5	93,044	2460.0	− 2502	−42	× 82 / 333	−10.3
6	93,046	2480.9	− 2531	−50.1	× 90 / 333	−13.5
Sum, rounded to a whole point						−37

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	95,806	2404.0	− 2432	−28	× 77 / 328	−6.6
4	95,808	2440.6	− 2473	−32.4	× 84 / 328	−8.3
5	95,810	2495.1	− 2502	−6.9	× 80 / 328	−1.7
6	95,813	2489.5	− 2531	−41.5	× 87 / 328	−11
Sum, rounded to a whole point						−28

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	95,996	2397.4	− 2432	−34.6	× 77 / 350	−7.6
4	95,999	2465.5	− 2473	−7.5	× 84 / 350	−1.8
5	96,000	2463.1	− 2502	−38.9	× 101 / 350	−11.2
6	96,003	2530.1	− 2531	−0.9	× 88 / 350	−0.2
Sum, rounded to a whole point						−21

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	96,661	2399.2	− 2432	−32.8	× 83 / 350	−7.8
4	96,662	2463.6	− 2473	−9.4	× 77 / 350	−2.1
5	96,663	2501.9	− 2502	−0.1	× 89 / 350	0
6	96,664	2516.0	− 2531	−15	× 101 / 350	−4.3
Sum, rounded to a whole point						−14

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	96,851	2395.9	− 2432	−36.1	× 60 / 280	−7.7
4	96,852	2425.8	− 2473	−47.2	× 62 / 280	−10.5
5	96,853	2486.8	− 2502	−15.2	× 78 / 280	−4.2
6	96,854	2486.9	− 2531	−44.1	× 80 / 280	−12.6
Sum, rounded to a whole point						−35

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	96,704	2395.4	− 2432	−36.6	× 57 / 247	−8.4
4	96,705	2451.7	− 2473	−21.3	× 60 / 247	−5.2
5	96,706	2461.7	− 2502	−40.3	× 62 / 247	−10.1
6	96,707	2505.1	− 2531	−25.9	× 68 / 247	−7.1
Sum, rounded to a whole point						−31

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	96,596	2367.8	− 2432	−64.2	× 48 / 230	−13.4
4	96,597	2443.4	− 2473	−29.6	× 56 / 230	−7.2
5	96,598	2494.8	− 2502	−7.2	× 62 / 230	−1.9
6	96,599	2473.7	− 2531	−57.3	× 64 / 230	−15.9
Sum, rounded to a whole point						−38

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	96,324	2368.0	− 2432	−64	× 56 / 225	−15.9
4	96,325	2452.6	− 2473	−20.4	× 50 / 225	−4.5
5	96,326	2497.2	− 2502	−4.8	× 58 / 225	−1.2
6	96,327	2519.1	− 2531	−11.9	× 61 / 225	−3.2
Sum, rounded to a whole point						−25

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −51, −37, −28, −21, −14, −35, −31, −38, −25 → −31.1
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 14 · 2016→2017: 9 · 2017→2018: 7 · 2018→2019: 7 · 2019→2022: 21 · 2022→2023: 4 · 2023→2024: 7 · 2024→2025: 13 → average 10.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 10.3 × 2.66 = 27.4. Upper limit −3.7, lower limit −58.5.

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