Bradley 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	67,977	2376.2	− 2436	−59.8	× 80 / 299	−16
4	67,979	2416.2	− 2485	−68.8	× 83 / 299	−19.1
5	67,981	2416.7	− 2528	−111.3	× 69 / 299	−25.7
6	67,983	2480.2	− 2552	−71.8	× 67 / 299	−16.1
Sum, rounded to a whole point						−77

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	62,985	2398.0	− 2436	−38	× 85 / 290	−11.1
4	62,988	2428.1	− 2485	−56.9	× 76 / 290	−14.9
5	62,989	2422.7	− 2528	−105.3	× 71 / 290	−25.8
6	62,992	2426.5	− 2552	−125.5	× 58 / 290	−25.1
Sum, rounded to a whole point						−77

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	64,773	2421.0	− 2436	−15	× 64 / 282	−3.4
4	64,775	2433.2	− 2485	−51.8	× 84 / 282	−15.4
5	64,777	2438.3	− 2528	−89.7	× 69 / 282	−21.9
6	64,780	2474.1	− 2552	−77.9	× 65 / 282	−18
Sum, rounded to a whole point						−59

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	64,863	2436.9	− 2436	0.9	× 66 / 281	0.2
4	64,865	2426.7	− 2485	−58.3	× 67 / 281	−13.9
5	64,867	2457.5	− 2528	−70.5	× 85 / 281	−21.3
6	64,869	2481.2	− 2552	−70.8	× 63 / 281	−15.9
Sum, rounded to a whole point						−51

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,233	2433.2	− 2436	−2.8	× 66 / 259	−0.7
4	65,234	2454.8	− 2485	−30.2	× 62 / 259	−7.2
5	65,235	2441.9	− 2528	−86.1	× 66 / 259	−21.9
6	65,236	2517.4	− 2552	−34.6	× 65 / 259	−8.7
Sum, rounded to a whole point						−39

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,324	2406.5	− 2436	−29.5	× 81 / 263	−9.1
4	65,325	2419.3	− 2485	−65.7	× 62 / 263	−15.5
5	65,326	2444.9	− 2528	−83.1	× 62 / 263	−19.6
6	65,327	2479.2	− 2552	−72.8	× 58 / 263	−16.1
Sum, rounded to a whole point						−60

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,329	2378.3	− 2436	−57.7	× 73 / 265	−15.9
4	65,330	2445.4	− 2485	−39.6	× 79 / 265	−11.8
5	65,331	2455.9	− 2528	−72.1	× 58 / 265	−15.8
6	65,332	2455.2	− 2552	−96.8	× 55 / 265	−20.1
Sum, rounded to a whole point						−64

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,297	2393.9	− 2436	−42.1	× 68 / 272	−10.5
4	65,298	2430.7	− 2485	−54.3	× 76 / 272	−15.2
5	65,299	2452.4	− 2528	−75.6	× 82 / 272	−22.8
6	65,300	2487.7	− 2552	−64.3	× 46 / 272	−10.9
Sum, rounded to a whole point						−59

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,057	2413.8	− 2436	−22.2	× 61 / 264	−5.1
4	65,058	2438.3	− 2485	−46.7	× 76 / 264	−13.4
5	65,059	2460.5	− 2528	−67.5	× 77 / 264	−19.7
6	65,060	2452.4	− 2552	−99.6	× 50 / 264	−18.9
Sum, rounded to a whole point						−57

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −77, −77, −59, −51, −39, −60, −64, −59, −57 → −60.3
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 0 · 2016→2017: 18 · 2017→2018: 8 · 2018→2019: 12 · 2019→2022: 21 · 2022→2023: 4 · 2023→2024: 5 · 2024→2025: 2 → average 8.8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 8.8 × 2.66 = 23.4. Upper limit −36.9, lower limit −83.7.

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.