Westlake Charter: 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	62,931	2449.1	− 2436	13.1	× 104 / 328	4.2
4	62,932	2492.3	− 2485	7.3	× 112 / 328	2.5
5	62,935	2532.9	− 2528	4.9	× 112 / 328	1.7
Sum, rounded to a whole point						8

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,373	2465.4	− 2436	29.4	× 109 / 326	9.8
4	58,375	2507.5	− 2485	22.5	× 105 / 326	7.2
5	58,378	2517.5	− 2528	−10.5	× 112 / 326	−3.6
Sum, rounded to a whole point						13

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	60,060	2437.4	− 2436	1.4	× 107 / 579	0.3
4	60,062	2500.2	− 2485	15.2	× 111 / 579	2.9
5	60,064	2506.2	− 2528	−21.8	× 105 / 579	−4
6	60,067	2551.3	− 2552	−0.7	× 86 / 579	−0.1
7	60,069	2554.2	− 2567	−12.8	× 88 / 579	−1.9
8	60,070	2518.3	− 2586	−67.7	× 82 / 579	−9.6
Sum, rounded to a whole point						−12

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	60,175	2466.6	− 2436	30.6	× 110 / 584	5.8
4	60,178	2505.6	− 2485	20.6	× 107 / 584	3.8
5	60,179	2510.8	− 2528	−17.2	× 112 / 584	−3.3
6	60,182	2533.0	− 2552	−19	× 85 / 584	−2.8
7	60,183	2561.2	− 2567	−5.8	× 87 / 584	−0.9
8	60,186	2567.9	− 2586	−18.1	× 83 / 584	−2.6
Sum, rounded to a whole point						0

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	60,425	2458.4	− 2436	22.4	× 107 / 602	4
4	60,426	2510.5	− 2485	25.5	× 111 / 602	4.7
5	60,427	2512.5	− 2528	−15.5	× 110 / 602	−2.8
6	60,428	2544.1	− 2552	−7.9	× 108 / 602	−1.4
7	60,429	2555.0	− 2567	−12	× 82 / 602	−1.6
8	60,430	2578.2	− 2586	−7.8	× 84 / 602	−1.1
Sum, rounded to a whole point						2

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	60,495	2434.6	− 2436	−1.4	× 110 / 661	−0.2
4	60,496	2479.7	− 2485	−5.3	× 111 / 661	−0.9
5	60,497	2504.0	− 2528	−24	× 110 / 661	−4
6	60,498	2519.7	− 2552	−32.3	× 110 / 661	−5.4
7	60,499	2569.8	− 2567	2.8	× 111 / 661	0.5
8	60,500	2532.6	− 2586	−53.4	× 109 / 661	−8.8
Sum, rounded to a whole point						−19

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	60,446	2418.1	− 2436	−17.9	× 108 / 663	−2.9
4	60,447	2479.5	− 2485	−5.5	× 111 / 663	−0.9
5	60,448	2516.9	− 2528	−11.1	× 111 / 663	−1.9
6	60,449	2512.9	− 2552	−39.1	× 111 / 663	−6.5
7	60,450	2555.7	− 2567	−11.3	× 112 / 663	−1.9
8	60,451	2572.4	− 2586	−13.6	× 110 / 663	−2.3
Sum, rounded to a whole point						−16

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	60,390	2407.2	− 2436	−28.8	× 110 / 782	−4.1
4	60,391	2451.8	− 2485	−33.2	× 109 / 782	−4.6
5	60,392	2517.1	− 2528	−10.9	× 111 / 782	−1.5
6	60,393	2536.6	− 2552	−15.4	× 110 / 782	−2.2
7	60,394	2573.7	− 2567	6.7	× 110 / 782	0.9
8	60,395	2535.6	− 2586	−50.4	× 111 / 782	−7.2
11	60,396	2558.7	− 2628	−69.3	× 121 / 782	−10.7
Sum, rounded to a whole point						−29

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	60,149	2409.5	− 2436	−26.5	× 104 / 752	−3.7
4	60,150	2456.4	− 2485	−28.6	× 112 / 752	−4.3
5	60,151	2502.1	− 2528	−25.9	× 111 / 752	−3.8
6	60,152	2507.8	− 2552	−44.2	× 111 / 752	−6.5
7	60,153	2579.6	− 2567	12.6	× 108 / 752	1.8
8	60,154	2586.2	− 2586	0.2	× 110 / 752	0
11	60,155	2569.7	− 2628	−58.3	× 96 / 752	−7.4
Sum, rounded to a whole point						−24

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. 8, 13, −12, 0, 2, −19, −16, −29, −24 → −8.6
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: 25 · 2017→2018: 12 · 2018→2019: 2 · 2019→2022: 21 · 2022→2023: 3 · 2023→2024: 13 · 2024→2025: 5 → average 10.8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 10.8 × 2.66 = 28.7. Upper limit 20.1, lower limit −37.3.

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.