Roseland: math · Schoolio

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	95,056	2396.2	− 2436	−39.8	× 192 / 911	−8.4
4	95,059	2432.1	− 2485	−52.9	× 254 / 911	−14.7
5	95,060	2467.9	− 2528	−60.1	× 244 / 911	−16.1
6	95,063	2500.2	− 2552	−51.8	× 221 / 911	−12.6
Sum, rounded to a whole point						−52

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	88,265	2414.0	− 2436	−22	× 207 / 887	−5.1
4	88,268	2449.5	− 2485	−35.5	× 175 / 887	−7
5	88,269	2475.7	− 2528	−52.3	× 257 / 887	−15.2
6	88,271	2510.3	− 2552	−41.7	× 248 / 887	−11.7
Sum, rounded to a whole point						−39

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	90,821	2414.9	− 2436	−21.1	× 200 / 819	−5.2
4	90,822	2454.5	− 2485	−30.5	× 183 / 819	−6.8
5	90,825	2465.7	− 2528	−62.3	× 173 / 819	−13.2
6	90,826	2500.9	− 2552	−51.1	× 263 / 819	−16.4
Sum, rounded to a whole point						−42

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,025	2417.7	− 2436	−18.3	× 198 / 744	−4.9
4	91,027	2455.8	− 2485	−29.2	× 182 / 744	−7.1
5	91,029	2473.0	− 2528	−55	× 188 / 744	−13.9
6	91,031	2501.9	− 2552	−50.1	× 176 / 744	−11.9
Sum, rounded to a whole point						−38

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,670	2408.1	− 2436	−27.9	× 214 / 753	−7.9
4	91,671	2454.5	− 2485	−30.5	× 183 / 753	−7.4
5	91,672	2490.2	− 2528	−37.8	× 170 / 753	−8.5
6	91,673	2524.8	− 2552	−27.2	× 186 / 753	−6.7
Sum, rounded to a whole point						−31

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,917	2382.9	− 2436	−53.1	× 210 / 853	−13.1
4	91,918	2422.9	− 2485	−62.1	× 189 / 853	−13.8
5	91,919	2440.2	− 2528	−87.8	× 230 / 853	−23.7
6	91,920	2471.4	− 2552	−80.6	× 224 / 853	−21.2
Sum, rounded to a whole point						−72

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,818	2401.5	− 2436	−34.5	× 175 / 793	−7.6
4	91,819	2439.5	− 2485	−45.5	× 209 / 793	−12
5	91,820	2454.1	− 2528	−73.9	× 184 / 793	−17.1
6	91,821	2478.0	− 2552	−74	× 225 / 793	−21
Sum, rounded to a whole point						−58

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,755	2402.0	− 2436	−34	× 214 / 808	−9
4	91,756	2439.8	− 2485	−45.2	× 184 / 808	−10.3
5	91,757	2462.7	− 2528	−65.3	× 217 / 808	−17.5
6	91,758	2480.6	− 2552	−71.4	× 193 / 808	−17.1
Sum, rounded to a whole point						−54

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,456	2405.5	− 2436	−30.5	× 218 / 873	−7.6
4	91,457	2445.2	− 2485	−39.8	× 227 / 873	−10.3
5	91,458	2452.5	− 2528	−75.5	× 197 / 873	−17
6	91,459	2484.5	− 2552	−67.5	× 231 / 873	−17.9
Sum, rounded to a whole point						−53

2026 from sb_ca2026_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,109	2386.1	− 2436	−49.9	× 234 / 900	−13
4	91,110	2439.3	− 2485	−45.7	× 231 / 900	−11.7
5	91,111	2456.2	− 2528	−71.8	× 236 / 900	−18.8
6	91,112	2474.0	− 2552	−78	× 199 / 900	−17.2
Sum, rounded to a whole point						−61

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −52, −39, −42, −38, −31, −72, −58, −54, −53, −61 → −50
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 13 · 2016→2017: 3 · 2017→2018: 4 · 2018→2019: 7 · 2019→2022: 41 · 2022→2023: 14 · 2023→2024: 4 · 2024→2025: 1 · 2025→2026: 8 → average 10.6
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 10.6 × 2.66 = 28.2. Upper limit −21.8, lower limit −78.2.

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 — 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.

Roseland