Jefferson: 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
3	63,031	2395.8	− 2436	−40.2	× 73 / 248	−11.8
4	63,032	2422.3	− 2485	−62.7	× 62 / 248	−15.7
5	63,035	2463.5	− 2528	−64.5	× 69 / 248	−17.9
6	63,036	2474.7	− 2552	−77.3	× 44 / 248	−13.7
Sum, rounded to a whole point						−59

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,473	2402.3	− 2436	−33.7	× 71 / 219	−10.9
4	58,475	2425.8	− 2485	−59.2	× 84 / 219	−22.7
5	58,478	2444.2	− 2528	−83.8	× 64 / 219	−24.5
Sum, rounded to a whole point						−58

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	60,178	2399.7	− 2436	−36.3	× 75 / 233	−11.7
4	60,180	2437.3	− 2485	−47.7	× 71 / 233	−14.5
5	60,182	2453.7	− 2528	−74.3	× 87 / 233	−27.7
Sum, rounded to a whole point						−54

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	60,300	2414.4	− 2436	−21.6	× 71 / 313	−4.9
4	60,302	2440.0	− 2485	−45	× 85 / 313	−12.2
5	60,303	2444.7	− 2528	−83.3	× 71 / 313	−18.9
6	60,306	2489.8	− 2552	−62.2	× 86 / 313	−17.1
Sum, rounded to a whole point						−53

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	60,552	2393.0	− 2436	−43	× 79 / 401	−8.5
4	60,553	2446.5	− 2485	−38.5	× 88 / 401	−8.4
5	60,554	2470.3	− 2528	−57.7	× 80 / 401	−11.5
6	60,555	2512.4	− 2552	−39.6	× 72 / 401	−7.1
7	60,556	2496.2	− 2567	−70.8	× 82 / 401	−14.5
Sum, rounded to a whole point						−50

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	60,643	2362.9	− 2436	−73.1	× 81 / 440	−13.5
4	60,644	2411.7	− 2485	−73.3	× 79 / 440	−13.2
5	60,645	2440.1	− 2528	−87.9	× 63 / 440	−12.6
6	60,646	2428.5	− 2552	−123.5	× 79 / 440	−22.2
7	60,647	2461.3	− 2567	−105.7	× 66 / 440	−15.9
8	60,648	2434.5	− 2586	−151.5	× 72 / 440	−24.8
Sum, rounded to a whole point						−102

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	60,588	2373.1	− 2436	−62.9	× 90 / 485	−11.7
4	60,589	2404.5	− 2485	−80.5	× 93 / 485	−15.4
5	60,590	2424.8	− 2528	−103.2	× 87 / 485	−18.5
6	60,591	2421.5	− 2552	−130.5	× 66 / 485	−17.8
7	60,592	2437.1	− 2567	−129.9	× 81 / 485	−21.7
8	60,593	2440.3	− 2586	−145.7	× 68 / 485	−20.4
Sum, rounded to a whole point						−106

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	60,535	2387.2	− 2436	−48.8	× 74 / 479	−7.5
4	60,536	2426.1	− 2485	−58.9	× 89 / 479	−10.9
5	60,537	2430.5	− 2528	−97.5	× 90 / 479	−18.3
6	60,538	2454.4	− 2552	−97.6	× 91 / 479	−18.5
7	60,539	2454.8	− 2567	−112.2	× 64 / 479	−15
8	60,540	2455.8	− 2586	−130.2	× 71 / 479	−19.3
Sum, rounded to a whole point						−90

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	60,288	2383.6	− 2436	−52.4	× 74 / 479	−8.1
4	60,289	2442.2	− 2485	−42.8	× 80 / 479	−7.1
5	60,290	2454.7	− 2528	−73.3	× 88 / 479	−13.5
6	60,291	2450.7	− 2552	−101.3	× 90 / 479	−19
7	60,292	2476.3	− 2567	−90.7	× 83 / 479	−15.7
8	60,293	2445.1	− 2586	−140.9	× 64 / 479	−18.8
Sum, rounded to a whole point						−82

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −59, −58, −54, −53, −50, −102, −106, −90, −82 → −72.7
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 1 · 2016→2017: 4 · 2017→2018: 1 · 2018→2019: 3 · 2019→2022: 52 · 2022→2023: 4 · 2023→2024: 16 · 2024→2025: 8 → average 11.1
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 11.1 × 2.66 = 29.5. Upper limit −43.2, lower limit −102.2.

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.