Ackerman Charter: 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	53,565	2448.9	− 2436	12.9	× 57 / 341	2.2
4	53,566	2492.1	− 2485	7.1	× 62 / 341	1.3
5	53,569	2534.2	− 2528	6.2	× 61 / 341	1.1
6	53,570	2534.1	− 2552	−17.9	× 54 / 341	−2.8
7	53,573	2558.9	− 2567	−8.1	× 54 / 341	−1.3
8	53,574	2551.5	− 2586	−34.5	× 53 / 341	−5.4
Sum, rounded to a whole point						−5

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	49,766	2445.3	− 2436	9.3	× 62 / 362	1.6
4	49,768	2502.6	− 2485	17.6	× 63 / 362	3.1
5	49,770	2540.7	− 2528	12.7	× 63 / 362	2.2
6	49,771	2573.8	− 2552	21.8	× 63 / 362	3.8
7	49,773	2571.7	− 2567	4.7	× 53 / 362	0.7
8	49,776	2578.2	− 2586	−7.8	× 58 / 362	−1.2
Sum, rounded to a whole point						10

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	51,157	2468.3	− 2436	32.3	× 64 / 362	5.7
4	51,159	2505.3	− 2485	20.3	× 62 / 362	3.5
5	51,161	2537.3	− 2528	9.3	× 65 / 362	1.7
6	51,163	2583.4	− 2552	31.4	× 60 / 362	5.2
7	51,165	2582.4	− 2567	15.4	× 61 / 362	2.6
8	51,168	2590.3	− 2586	4.3	× 50 / 362	0.6
Sum, rounded to a whole point						19

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	51,186	2475.6	− 2436	39.6	× 67 / 376	7.1
4	51,187	2507.6	− 2485	22.6	× 62 / 376	3.7
5	51,190	2539.7	− 2528	11.7	× 60 / 376	1.9
6	51,191	2541.9	− 2552	−10.1	× 64 / 376	−1.7
7	51,194	2581.0	− 2567	14	× 61 / 376	2.3
8	51,195	2610.9	− 2586	24.9	× 62 / 376	4.1
Sum, rounded to a whole point						17

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	51,395	2471.5	− 2436	35.5	× 68 / 368	6.6
4	51,396	2516.5	− 2485	31.5	× 67 / 368	5.7
5	51,397	2524.0	− 2528	−4	× 58 / 368	−0.6
6	51,398	2534.1	− 2552	−17.9	× 60 / 368	−2.9
7	51,399	2588.2	− 2567	21.2	× 61 / 368	3.5
8	51,400	2614.0	− 2586	28	× 54 / 368	4.1
Sum, rounded to a whole point						16

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	50,140	2429.8	− 2436	−6.2	× 65 / 356	−1.1
4	50,141	2469.1	− 2485	−15.9	× 57 / 356	−2.5
5	50,142	2539.9	− 2528	11.9	× 59 / 356	2
6	50,143	2553.5	− 2552	1.5	× 65 / 356	0.3
7	50,144	2560.8	− 2567	−6.2	× 56 / 356	−1
8	50,145	2555.2	− 2586	−30.8	× 54 / 356	−4.7
Sum, rounded to a whole point						−7

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	51,309	2451.2	− 2436	15.2	× 56 / 352	2.4
4	51,310	2475.4	− 2485	−9.6	× 64 / 352	−1.7
5	51,311	2537.0	− 2528	9	× 54 / 352	1.4
6	51,312	2566.3	− 2552	14.3	× 58 / 352	2.4
7	51,313	2565.8	− 2567	−1.2	× 61 / 352	−0.2
8	51,314	2592.5	− 2586	6.5	× 59 / 352	1.1
Sum, rounded to a whole point						5

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	51,272	2470.1	− 2436	34.1	× 60 / 373	5.5
4	51,273	2476.5	− 2485	−8.5	× 61 / 373	−1.4
5	51,274	2565.4	− 2528	37.4	× 63 / 373	6.3
6	51,275	2549.3	− 2552	−2.7	× 59 / 373	−0.4
7	51,276	2553.6	− 2567	−13.4	× 64 / 373	−2.3
8	51,277	2589.6	− 2586	3.6	× 66 / 373	0.6
Sum, rounded to a whole point						8

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	51,124	2449.4	− 2436	13.4	× 65 / 377	2.3
4	51,125	2523.0	− 2485	38	× 62 / 377	6.2
5	51,126	2536.0	− 2528	8	× 65 / 377	1.4
6	51,127	2559.6	− 2552	7.6	× 66 / 377	1.3
7	51,128	2533.2	− 2567	−33.8	× 58 / 377	−5.2
8	51,129	2581.5	− 2586	−4.5	× 61 / 377	−0.7
Sum, rounded to a whole point						5

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	50,890	2448.5	− 2436	12.5	× 66 / 383	2.2
4	50,891	2492.2	− 2485	7.2	× 63 / 383	1.2
5	50,892	2556.2	− 2528	28.2	× 64 / 383	4.7
6	50,893	2516.7	− 2552	−35.3	× 63 / 383	−5.8
7	50,894	2558.0	− 2567	−9	× 69 / 383	−1.6
8	50,895	2569.8	− 2586	−16.2	× 58 / 383	−2.5
Sum, rounded to a whole point						−2

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −5, 10, 19, 17, 16, −7, 5, 8, 5, −2 → 6.6
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 15 · 2016→2017: 9 · 2017→2018: 2 · 2018→2019: 1 · 2019→2021: 23 · 2021→2022: 12 · 2022→2023: 3 · 2023→2024: 3 · 2024→2025: 7 → average 8.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 8.3 × 2.66 = 22.1. Upper limit 28.7, lower limit −15.5.

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 — 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.

Schools in Ackerman Charter

Bowman Charter Charter