Charter Oak Unified: math

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	22,133	2435.0	− 2436	−1	× 314 / 2604	−0.1
4	22,135	2464.5	− 2485	−20.5	× 358 / 2604	−2.8
5	22,137	2501.7	− 2528	−26.3	× 363 / 2604	−3.7
6	22,139	2528.7	− 2552	−23.3	× 382 / 2604	−3.4
7	22,141	2529.9	− 2567	−37.1	× 355 / 2604	−5.1
8	22,143	2542.1	− 2586	−43.9	× 358 / 2604	−6
11	22,145	2580.9	− 2628	−47.1	× 474 / 2604	−8.6
Sum, rounded to a whole point						−30

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	20,864	2439.0	− 2436	3	× 370 / 2545	0.4
4	20,867	2474.6	− 2485	−10.4	× 327 / 2545	−1.3
5	20,869	2496.4	− 2528	−31.6	× 361 / 2545	−4.5
6	20,870	2547.0	− 2552	−5	× 364 / 2545	−0.7
7	20,873	2534.8	− 2567	−32.2	× 341 / 2545	−4.3
8	20,875	2561.7	− 2586	−24.3	× 354 / 2545	−3.4
11	20,877	2563.2	− 2628	−64.8	× 428 / 2545	−10.9
Sum, rounded to a whole point						−25

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	21,210	2441.2	− 2436	5.2	× 322 / 2561	0.7
4	21,212	2465.8	− 2485	−19.2	× 373 / 2561	−2.8
5	21,215	2487.5	− 2528	−40.5	× 361 / 2561	−5.7
6	21,216	2534.2	− 2552	−17.8	× 378 / 2561	−2.6
7	21,219	2547.1	− 2567	−19.9	× 353 / 2561	−2.7
8	21,220	2558.3	− 2586	−27.7	× 349 / 2561	−3.8
11	21,223	2563.7	− 2628	−64.3	× 425 / 2561	−10.7
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	21,191	2456.4	− 2436	20.4	× 307 / 2447	2.6
4	21,193	2478.2	− 2485	−6.8	× 323 / 2447	−0.9
5	21,195	2499.2	− 2528	−28.8	× 366 / 2447	−4.3
6	21,197	2536.2	− 2552	−15.8	× 336 / 2447	−2.2
7	21,200	2536.7	− 2567	−30.3	× 366 / 2447	−4.5
8	21,201	2579.2	− 2586	−6.8	× 366 / 2447	−1
11	21,204	2565.5	− 2628	−62.5	× 383 / 2447	−9.8
Sum, rounded to a whole point						−20

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	21,367	2450.3	− 2436	14.3	× 325 / 2397	1.9
4	21,368	2487.9	− 2485	2.9	× 315 / 2397	0.4
5	21,369	2503.6	− 2528	−24.4	× 333 / 2397	−3.4
6	21,370	2531.4	− 2552	−20.6	× 357 / 2397	−3.1
7	21,371	2544.9	− 2567	−22.1	× 327 / 2397	−3
8	21,372	2563.3	− 2586	−22.7	× 368 / 2397	−3.5
11	21,373	2579.7	− 2628	−48.3	× 372 / 2397	−7.5
Sum, rounded to a whole point						−18

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	20,836	2620.3	− 2628	−7.7	× 235 / 235	−7.7
Sum, rounded to a whole point						−8

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	21,344	2434.3	− 2436	−1.7	× 286 / 2224	−0.2
4	21,345	2466.6	− 2485	−18.4	× 289 / 2224	−2.4
5	21,346	2469.3	− 2528	−58.7	× 320 / 2224	−8.4
6	21,347	2514.0	− 2552	−38	× 314 / 2224	−5.4
7	21,348	2537.6	− 2567	−29.4	× 305 / 2224	−4
8	21,349	2549.7	− 2586	−36.3	× 324 / 2224	−5.3
11	21,350	2538.5	− 2628	−89.5	× 386 / 2224	−15.5
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	21,311	2428.9	− 2436	−7.1	× 293 / 2159	−1
4	21,312	2474.2	− 2485	−10.8	× 290 / 2159	−1.5
5	21,313	2477.7	− 2528	−50.3	× 312 / 2159	−7.3
6	21,314	2502.1	− 2552	−49.9	× 295 / 2159	−6.8
7	21,315	2524.8	− 2567	−42.2	× 320 / 2159	−6.3
8	21,316	2568.3	− 2586	−17.7	× 311 / 2159	−2.5
11	21,317	2559.1	− 2628	−68.9	× 338 / 2159	−10.8
Sum, rounded to a whole point						−36

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	21,179	2430.9	− 2436	−5.1	× 279 / 2150	−0.7
4	21,180	2464.1	− 2485	−20.9	× 308 / 2150	−3
5	21,181	2480.0	− 2528	−48	× 287 / 2150	−6.4
6	21,182	2514.2	− 2552	−37.8	× 320 / 2150	−5.6
7	21,183	2520.1	− 2567	−46.9	× 293 / 2150	−6.4
8	21,184	2563.1	− 2586	−22.9	× 330 / 2150	−3.5
11	21,185	2537.9	− 2628	−90.1	× 333 / 2150	−14
Sum, rounded to a whole point						−40

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	21,098	2456.2	− 2436	20.2	× 278 / 2130	2.6
4	21,099	2457.2	− 2485	−27.8	× 294 / 2130	−3.8
5	21,100	2480.3	− 2528	−47.7	× 309 / 2130	−6.9
6	21,101	2519.2	− 2552	−32.8	× 293 / 2130	−4.5
7	21,102	2532.9	− 2567	−34.1	× 319 / 2130	−5.1
8	21,103	2563.8	− 2586	−22.2	× 297 / 2130	−3.1
11	21,104	2537.3	− 2628	−90.7	× 340 / 2130	−14.5
Sum, rounded to a whole point						−35

2026 from sb_ca2026_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	21,150	2452.9	− 2436	16.9	× 258 / 2022	2.2
4	21,151	2462.3	− 2485	−22.7	× 271 / 2022	−3
5	21,152	2484.3	− 2528	−43.7	× 282 / 2022	−6.1
6	21,153	2509.7	− 2552	−42.3	× 308 / 2022	−6.4
7	21,154	2548.9	− 2567	−18.1	× 289 / 2022	−2.6
8	21,155	2569.6	− 2586	−16.4	× 308 / 2022	−2.5
11	21,156	2554.3	− 2628	−73.7	× 306 / 2022	−11.2
Sum, rounded to a whole point						−30

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −30, −25, −28, −20, −18, −8, −41, −36, −40, −35, −30 → −28.3
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 5 · 2016→2017: 3 · 2017→2018: 8 · 2018→2019: 2 · 2019→2021: 10 · 2021→2022: 33 · 2022→2023: 5 · 2023→2024: 4 · 2024→2025: 5 · 2025→2026: 5 → average 8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 8 × 2.66 = 21.3. Upper limit −7, lower limit −49.6.

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.

Charter Oak Unified