Rosedell Elementary: 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	37,355	2425.6	− 2436	−10.4	× 121 / 444	−2.8
4	37,358	2438.2	− 2485	−46.8	× 111 / 444	−11.7
5	37,359	2512.1	− 2528	−15.9	× 109 / 444	−3.9
6	37,362	2582.8	− 2552	30.8	× 103 / 444	7.1
Sum, rounded to a whole point						−11

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	34,753	2435.5	− 2436	−0.5	× 96 / 438	−0.1
4	34,754	2468.9	− 2485	−16.1	× 117 / 438	−4.3
5	34,756	2496.0	− 2528	−32	× 116 / 438	−8.5
6	34,759	2561.6	− 2552	9.6	× 109 / 438	2.4
Sum, rounded to a whole point						−10

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	35,399	2430.3	− 2436	−5.7	× 116 / 448	−1.5
4	35,400	2460.1	− 2485	−24.9	× 94 / 448	−5.2
5	35,403	2493.3	− 2528	−34.7	× 124 / 448	−9.6
6	35,404	2522.4	− 2552	−29.6	× 114 / 448	−7.5
Sum, rounded to a whole point						−24

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	35,409	2440.8	− 2436	4.8	× 85 / 416	1
4	35,411	2472.3	− 2485	−12.7	× 109 / 416	−3.3
5	35,413	2488.5	− 2528	−39.5	× 91 / 416	−8.6
6	35,415	2535.0	− 2552	−17	× 131 / 416	−5.4
Sum, rounded to a whole point						−16

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	35,576	2423.0	− 2436	−13	× 108 / 400	−3.5
4	35,577	2479.2	− 2485	−5.8	× 91 / 400	−1.3
5	35,578	2495.8	− 2528	−32.2	× 104 / 400	−8.4
6	35,579	2554.7	− 2552	2.7	× 97 / 400	0.7
Sum, rounded to a whole point						−13

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	35,465	2462.9	− 2436	26.9	× 91 / 378	6.5
4	35,466	2496.8	− 2485	11.8	× 92 / 378	2.9
5	35,467	2478.7	− 2528	−49.3	× 93 / 378	−12.1
6	35,468	2515.0	− 2552	−37	× 102 / 378	−10
Sum, rounded to a whole point						−13

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	35,470	2448.8	− 2436	12.8	× 79 / 358	2.8
4	35,471	2494.5	− 2485	9.5	× 89 / 358	2.4
5	35,472	2497.0	− 2528	−31	× 92 / 358	−8
6	35,473	2516.2	− 2552	−35.8	× 98 / 358	−9.8
Sum, rounded to a whole point						−13

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	35,332	2465.6	− 2436	29.6	× 108 / 381	8.4
4	35,333	2481.7	− 2485	−3.3	× 82 / 381	−0.7
5	35,334	2520.0	− 2528	−8	× 94 / 381	−2
6	35,335	2546.5	− 2552	−5.5	× 97 / 381	−1.4
Sum, rounded to a whole point						4

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	35,183	2469.8	− 2436	33.8	× 82 / 371	7.5
4	35,184	2482.9	− 2485	−2.1	× 109 / 371	−0.6
5	35,185	2507.6	− 2528	−20.4	× 79 / 371	−4.3
6	35,186	2552.7	− 2552	0.7	× 101 / 371	0.2
Sum, rounded to a whole point						3

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −11, −10, −24, −16, −13, −13, −13, 4, 3 → −10.3
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: 14 · 2017→2018: 8 · 2018→2019: 3 · 2019→2022: 0 · 2022→2023: 0 · 2023→2024: 17 · 2024→2025: 1 → average 5.5
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 5.5 × 2.66 = 14.6. Upper limit 4.3, lower limit −24.9.

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.