Oakbrook Elementary: math

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	93,152	2409.1	− 2436	−26.9	× 57 / 303	−5.1
4	93,153	2451.1	− 2485	−33.9	× 63 / 303	−7
5	93,156	2484.9	− 2528	−43.1	× 58 / 303	−8.3
6	93,157	2485.8	− 2552	−66.2	× 87 / 303	−19
7	93,160	2492.1	− 2567	−74.9	× 38 / 303	−9.4
Sum, rounded to a whole point						−49

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	86,567	2422.5	− 2436	−13.5	× 75 / 402	−2.5
4	86,570	2447.1	− 2485	−37.9	× 68 / 402	−6.4
5	86,571	2493.7	− 2528	−34.3	× 66 / 402	−5.6
6	86,573	2466.6	− 2552	−85.4	× 99 / 402	−21
7	86,575	2504.5	− 2567	−62.5	× 60 / 402	−9.3
8	86,577	2489.6	− 2586	−96.4	× 34 / 402	−8.2
Sum, rounded to a whole point						−53

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	88,963	2413.3	− 2436	−22.7	× 58 / 374	−3.5
4	88,964	2459.1	− 2485	−25.9	× 83 / 374	−5.7
5	88,966	2490.0	− 2528	−38	× 66 / 374	−6.7
6	88,969	2498.0	− 2552	−54	× 71 / 374	−10.3
7	88,970	2475.7	− 2567	−91.3	× 50 / 374	−12.2
8	88,972	2485.2	− 2586	−100.8	× 46 / 374	−12.4
Sum, rounded to a whole point						−51

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	89,181	2444.3	− 2436	8.3	× 51 / 330	1.3
4	89,182	2461.2	− 2485	−23.8	× 53 / 330	−3.8
5	89,185	2509.9	− 2528	−18.1	× 72 / 330	−3.9
6	89,186	2494.7	− 2552	−57.3	× 64 / 330	−11.1
7	89,189	2531.2	− 2567	−35.8	× 53 / 330	−5.7
8	89,190	2480.1	− 2586	−105.9	× 37 / 330	−11.9
Sum, rounded to a whole point						−35

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	89,790	2479.5	− 2436	43.5	× 67 / 350	8.3
4	89,791	2477.9	− 2485	−7.1	× 55 / 350	−1.1
5	89,792	2504.1	− 2528	−23.9	× 46 / 350	−3.1
6	89,793	2512.9	− 2552	−39.1	× 76 / 350	−8.5
7	89,794	2523.0	− 2567	−44	× 53 / 350	−6.7
8	89,795	2527.8	− 2586	−58.2	× 53 / 350	−8.8
Sum, rounded to a whole point						−20

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	90,056	2442.6	− 2436	6.6	× 66 / 314	1.4
4	90,057	2462.6	− 2485	−22.4	× 46 / 314	−3.3
5	90,058	2490.3	− 2528	−37.7	× 60 / 314	−7.2
6	90,059	2465.3	− 2552	−86.7	× 59 / 314	−16.3
7	90,060	2533.3	− 2567	−33.7	× 47 / 314	−5
8	90,061	2495.8	− 2586	−90.2	× 36 / 314	−10.3
Sum, rounded to a whole point						−41

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	89,950	2420.8	− 2436	−15.2	× 66 / 367	−2.7
4	89,951	2464.3	− 2485	−20.7	× 70 / 367	−3.9
5	89,952	2475.6	− 2528	−52.4	× 57 / 367	−8.1
6	89,953	2489.6	− 2552	−62.4	× 59 / 367	−10
7	89,954	2517.5	− 2567	−49.5	× 60 / 367	−8.1
8	89,955	2485.5	− 2586	−100.5	× 55 / 367	−15.1
Sum, rounded to a whole point						−48

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	89,909	2410.4	− 2436	−25.6	× 56 / 361	−4
4	89,910	2462.8	− 2485	−22.2	× 66 / 361	−4.1
5	89,911	2492.1	− 2528	−35.9	× 63 / 361	−6.3
6	89,912	2494.6	− 2552	−57.4	× 56 / 361	−8.9
7	89,913	2488.6	− 2567	−78.4	× 56 / 361	−12.2
8	89,914	2500.4	− 2586	−85.6	× 64 / 361	−15.2
Sum, rounded to a whole point						−51

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	89,605	2423.5	− 2436	−12.5	× 66 / 366	−2.3
4	89,606	2439.9	− 2485	−45.1	× 57 / 366	−7
5	89,607	2477.7	− 2528	−50.3	× 66 / 366	−9.1
6	89,608	2501.6	− 2552	−50.4	× 67 / 366	−9.2
7	89,609	2505.2	− 2567	−61.8	× 49 / 366	−8.3
8	89,610	2528.6	− 2586	−57.4	× 61 / 366	−9.6
Sum, rounded to a whole point						−45

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −49, −53, −51, −35, −20, −41, −48, −51, −45 → −43.7
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 4 · 2016→2017: 2 · 2017→2018: 16 · 2018→2019: 15 · 2019→2022: 21 · 2022→2023: 7 · 2023→2024: 3 · 2024→2025: 6 → average 9.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 9.3 × 2.66 = 24.7. Upper limit −19, lower limit −68.4.

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.