Sunset: math · Schoolio

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
5	18,163	2392.4	− 2528	−135.6	× 96 / 340	−38.3
6	18,165	2411.7	− 2552	−140.3	× 66 / 340	−27.2
7	18,167	2399.5	− 2567	−167.5	× 92 / 340	−45.3
8	18,169	2504.9	− 2586	−81.1	× 86 / 340	−20.5
Sum, rounded to a whole point						−131

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	17,173	2429.7	− 2528	−98.3	× 82 / 324	−24.9
6	17,175	2408.5	− 2552	−143.5	× 89 / 324	−39.4
7	17,178	2426.5	− 2567	−140.5	× 63 / 324	−27.3
8	17,179	2502.5	− 2586	−83.5	× 90 / 324	−23.2
Sum, rounded to a whole point						−115

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	17,489	2424.7	− 2528	−103.3	× 66 / 282	−24.2
6	17,491	2424.2	− 2552	−127.8	× 75 / 282	−34
7	17,493	2413.5	− 2567	−153.5	× 79 / 282	−43
8	17,495	2428.8	− 2586	−157.2	× 62 / 282	−34.6
Sum, rounded to a whole point						−136

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	17,513	2421.2	− 2528	−106.8	× 80 / 297	−28.8
6	17,514	2461.9	− 2552	−90.1	× 66 / 297	−20
7	17,517	2463.6	− 2567	−103.4	× 78 / 297	−27.2
8	17,518	2447.8	− 2586	−138.2	× 73 / 297	−34
Sum, rounded to a whole point						−110

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	17,659	2417.2	− 2528	−110.8	× 70 / 291	−26.7
6	17,660	2456.1	− 2552	−95.9	× 75 / 291	−24.7
7	17,661	2480.5	− 2567	−86.5	× 68 / 291	−20.2
8	17,662	2484.3	− 2586	−101.7	× 78 / 291	−27.3
Sum, rounded to a whole point						−99

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	17,709	2420.0	− 2528	−108	× 64 / 295	−23.4
6	17,710	2408.7	− 2552	−143.3	× 73 / 295	−35.5
7	17,711	2442.4	− 2567	−124.6	× 76 / 295	−32.1
8	17,712	2443.5	− 2586	−142.5	× 82 / 295	−39.6
Sum, rounded to a whole point						−131

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	17,665	2411.4	− 2528	−116.6	× 95 / 315	−35.2
6	17,666	2453.2	− 2552	−98.8	× 65 / 315	−20.4
7	17,667	2430.7	− 2567	−136.3	× 74 / 315	−32
8	17,668	2446.8	− 2586	−139.2	× 81 / 315	−35.8
Sum, rounded to a whole point						−123

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	17,615	2414.3	− 2528	−113.7	× 71 / 303	−26.6
6	17,616	2441.4	− 2552	−110.6	× 93 / 303	−33.9
7	17,617	2463.3	− 2567	−103.7	× 65 / 303	−22.2
8	17,618	2441.9	− 2586	−144.1	× 74 / 303	−35.2
Sum, rounded to a whole point						−118

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	17,609	2393.4	− 2528	−134.6	× 68 / 306	−29.9
6	17,610	2448.2	− 2552	−103.8	× 69 / 306	−23.4
7	17,611	2457.9	− 2567	−109.1	× 99 / 306	−35.3
8	17,612	2462.8	− 2586	−123.2	× 70 / 306	−28.2
Sum, rounded to a whole point						−117

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −131, −115, −136, −110, −99, −131, −123, −118, −117 → −120
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 16 · 2016→2017: 21 · 2017→2018: 26 · 2018→2019: 11 · 2019→2022: 32 · 2022→2023: 8 · 2023→2024: 5 · 2024→2025: 1 → average 15
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 15 × 2.66 = 39.9. Upper limit −80.1, lower limit −159.9.

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.