River Oak Charter: 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	43,423	2383.3	− 2432	−48.7	× 25 / 138	−8.8
4	43,426	2405.3	− 2473	−67.7	× 23 / 138	−11.3
5	43,427	2501.7	− 2502	−0.3	× 24 / 138	−0.1
6	43,430	2532.0	− 2531	1	× 25 / 138	0.2
7	43,431	2568.6	− 2552	16.6	× 20 / 138	2.4
8	43,434	2584.5	− 2567	17.5	× 21 / 138	2.7
Sum, rounded to a whole point						−15

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	40,124	2401.4	− 2432	−30.6	× 25 / 143	−5.3
4	40,125	2452.8	− 2473	−20.2	× 25 / 143	−3.5
5	40,128	2448.3	− 2502	−53.7	× 26 / 143	−9.8
6	40,130	2528.0	− 2531	−3	× 24 / 143	−0.5
7	40,131	2561.6	− 2552	9.6	× 23 / 143	1.5
8	40,134	2604.6	− 2567	37.6	× 20 / 143	5.3
Sum, rounded to a whole point						−12

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,135	2373.3	− 2432	−58.7	× 26 / 147	−10.4
4	41,137	2426.2	− 2473	−46.8	× 26 / 147	−8.3
5	41,138	2452.3	− 2502	−49.7	× 25 / 147	−8.5
6	41,140	2504.4	− 2531	−26.6	× 25 / 147	−4.5
7	41,142	2558.2	− 2552	6.2	× 23 / 147	1
8	41,145	2592.5	− 2567	25.5	× 22 / 147	3.8
Sum, rounded to a whole point						−27

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,160	2424.8	− 2432	−7.2	× 26 / 147	−1.3
4	41,161	2395.7	− 2473	−77.3	× 27 / 147	−14.2
5	41,164	2494.4	− 2502	−7.6	× 24 / 147	−1.2
6	41,165	2479.6	− 2531	−51.4	× 24 / 147	−8.4
7	41,168	2525.1	− 2552	−26.9	× 25 / 147	−4.6
8	41,169	2562.8	− 2567	−4.2	× 21 / 147	−0.6
Sum, rounded to a whole point						−30

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,303	2386.4	− 2432	−45.6	× 27 / 150	−8.2
4	41,304	2455.1	− 2473	−17.9	× 24 / 150	−2.9
5	41,305	2486.7	− 2502	−15.3	× 26 / 150	−2.7
6	41,306	2524.2	− 2531	−6.8	× 26 / 150	−1.2
7	41,307	2531.6	− 2552	−20.4	× 23 / 150	−3.1
8	41,308	2554.6	− 2567	−12.4	× 24 / 150	−2
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	41,060	2332.4	− 2432	−99.6	× 26 / 142	−18.2
4	41,061	2430.3	− 2473	−42.7	× 24 / 142	−7.2
5	41,062	2460.9	− 2502	−41.1	× 20 / 142	−5.8
6	41,063	2520.8	− 2531	−10.2	× 25 / 142	−1.8
7	41,064	2576.6	− 2552	24.6	× 24 / 142	4.2
8	41,065	2562.4	− 2567	−4.6	× 23 / 142	−0.7
Sum, rounded to a whole point						−30

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,089	2410.4	− 2432	−21.6	× 25 / 142	−3.8
4	41,090	2424.9	− 2473	−48.1	× 25 / 142	−8.5
5	41,091	2507.6	− 2502	5.6	× 26 / 142	1
6	41,092	2447.8	− 2531	−83.2	× 19 / 142	−11.1
7	41,093	2574.1	− 2552	22.1	× 23 / 142	3.6
8	41,094	2605.8	− 2567	38.8	× 24 / 142	6.6
Sum, rounded to a whole point						−12

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	40,910	2342.9	− 2432	−89.1	× 22 / 141	−13.9
4	40,911	2459.2	− 2473	−13.8	× 24 / 141	−2.3
5	40,912	2494.8	− 2502	−7.2	× 26 / 141	−1.3
6	40,913	2522.0	− 2531	−9	× 25 / 141	−1.6
7	40,914	2536.4	− 2552	−15.6	× 19 / 141	−2.1
8	40,915	2573.2	− 2567	6.2	× 25 / 141	1.1
Sum, rounded to a whole point						−20

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	40,675	2400.7	− 2432	−31.3	× 26 / 144	−5.7
4	40,676	2437.0	− 2473	−36	× 23 / 144	−5.8
5	40,677	2526.7	− 2502	24.7	× 24 / 144	4.1
6	40,678	2527.2	− 2531	−3.8	× 25 / 144	−0.7
7	40,679	2567.4	− 2552	15.4	× 27 / 144	2.9
8	40,680	2567.9	− 2567	0.9	× 19 / 144	0.1
Sum, rounded to a whole point						−5

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −15, −12, −27, −30, −20, −30, −12, −20, −5 → −19
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 3 · 2016→2017: 15 · 2017→2018: 3 · 2018→2019: 10 · 2019→2022: 10 · 2022→2023: 18 · 2023→2024: 8 · 2024→2025: 15 → 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 8.4, lower limit −46.4.

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.