Jefferson Charter Academy: 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	18,761	2425.0	− 2436	−11	× 44 / 197	−2.5
4	18,762	2494.8	− 2485	9.8	× 59 / 197	2.9
5	18,765	2519.5	− 2528	−8.5	× 33 / 197	−1.4
6	18,766	2552.9	− 2552	0.9	× 32 / 197	0.1
7	18,769	2570.7	− 2567	3.7	× 29 / 197	0.5
Sum, rounded to a whole point						0

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	17,760	2444.5	− 2436	8.5	× 48 / 255	1.6
4	17,761	2476.9	− 2485	−8.1	× 54 / 255	−1.7
5	17,763	2532.5	− 2528	4.5	× 59 / 255	1
6	17,766	2587.8	− 2552	35.8	× 33 / 255	4.6
7	17,768	2643.6	− 2567	76.6	× 32 / 255	9.6
8	17,770	2653.3	− 2586	67.3	× 29 / 255	7.7
Sum, rounded to a whole point						23

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,099	2468.0	− 2436	32	× 48 / 289	5.3
4	18,102	2506.3	− 2485	21.3	× 63 / 289	4.6
5	18,103	2517.2	− 2528	−10.8	× 59 / 289	−2.2
6	18,105	2587.8	− 2552	35.8	× 59 / 289	7.3
7	18,108	2662.5	− 2567	95.5	× 30 / 289	9.9
8	18,110	2688.6	− 2586	102.6	× 30 / 289	10.7
Sum, rounded to a whole point						36

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,113	2440.1	− 2436	4.1	× 48 / 318	0.6
4	18,114	2502.8	− 2485	17.8	× 56 / 318	3.1
5	18,117	2553.1	− 2528	25.1	× 66 / 318	5.2
6	18,118	2572.8	− 2552	20.8	× 57 / 318	3.7
7	18,121	2634.7	− 2567	67.7	× 59 / 318	12.6
8	18,122	2677.8	− 2586	91.8	× 32 / 318	9.2
Sum, rounded to a whole point						34

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,262	2462.8	− 2436	26.8	× 48 / 368	3.5
4	18,263	2489.5	− 2485	4.5	× 64 / 368	0.8
5	18,264	2541.1	− 2528	13.1	× 64 / 368	2.3
6	18,265	2592.5	− 2552	40.5	× 66 / 368	7.3
7	18,266	2569.9	− 2567	2.9	× 63 / 368	0.5
8	18,267	2689.4	− 2586	103.4	× 63 / 368	17.7
Sum, rounded to a whole point						32

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	17,825	2425.2	− 2436	−10.8	× 39 / 303	−1.4
4	17,826	2496.0	− 2485	11	× 47 / 303	1.7
5	17,827	2507.3	− 2528	−20.7	× 60 / 303	−4.1
6	17,828	2518.3	− 2552	−33.7	× 61 / 303	−6.8
7	17,829	2566.2	− 2567	−0.8	× 42 / 303	−0.1
8	17,830	2663.1	− 2586	77.1	× 54 / 303	13.7
Sum, rounded to a whole point						3

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,303	2433.9	− 2436	−2.1	× 47 / 360	−0.3
4	18,304	2505.4	− 2485	20.4	× 55 / 360	3.1
5	18,305	2516.0	− 2528	−12	× 60 / 360	−2
6	18,306	2557.0	− 2552	5	× 69 / 360	1
7	18,307	2540.7	− 2567	−26.3	× 63 / 360	−4.6
8	18,308	2571.2	− 2586	−14.8	× 66 / 360	−2.7
Sum, rounded to a whole point						−6

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,246	2416.2	− 2436	−19.8	× 48 / 340	−2.8
4	18,247	2516.2	− 2485	31.2	× 58 / 340	5.3
5	18,248	2517.3	− 2528	−10.7	× 61 / 340	−1.9
6	18,249	2542.1	− 2552	−9.9	× 60 / 340	−1.7
7	18,250	2571.2	− 2567	4.2	× 59 / 340	0.7
8	18,251	2594.4	− 2586	8.4	× 54 / 340	1.3
Sum, rounded to a whole point						1

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,199	2464.2	− 2436	28.2	× 48 / 345	3.9
4	18,200	2498.1	− 2485	13.1	× 58 / 345	2.2
5	18,201	2556.4	− 2528	28.4	× 57 / 345	4.7
6	18,202	2547.9	− 2552	−4.1	× 65 / 345	−0.8
7	18,203	2565.6	− 2567	−1.4	× 62 / 345	−0.3
8	18,204	2610.3	− 2586	24.3	× 55 / 345	3.9
Sum, rounded to a whole point						14

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,193	2435.2	− 2436	−0.8	× 48 / 352	−0.1
4	18,194	2518.0	− 2485	33	× 57 / 352	5.3
5	18,195	2522.1	− 2528	−5.9	× 61 / 352	−1
6	18,196	2567.9	− 2552	15.9	× 60 / 352	2.7
7	18,197	2596.4	− 2567	29.4	× 63 / 352	5.3
8	18,198	2620.4	− 2586	34.4	× 63 / 352	6.2
Sum, rounded to a whole point						18

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. 0, 23, 36, 34, 32, 3, −6, 1, 14, 18 → 15.5
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 23 · 2016→2017: 13 · 2017→2018: 2 · 2018→2019: 2 · 2019→2021: 29 · 2021→2022: 9 · 2022→2023: 7 · 2023→2024: 13 · 2024→2025: 4 → average 11.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 11.3 × 2.66 = 30.1. Upper limit 45.6, lower limit −14.6.

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