Dewey Avenue 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	23,664	2466.7	− 2436	30.7	× 52 / 227	7
4	23,666	2471.0	− 2485	−14	× 56 / 227	−3.5
5	23,668	2474.7	− 2528	−53.3	× 48 / 227	−11.3
6	23,670	2538.3	− 2552	−13.7	× 71 / 227	−4.3
Sum, rounded to a whole point						−12

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	22,171	2493.9	− 2436	57.9	× 55 / 207	15.4
4	22,174	2497.2	− 2485	12.2	× 48 / 207	2.8
5	22,176	2486.0	− 2528	−42	× 54 / 207	−11
6	22,178	2517.7	− 2552	−34.3	× 50 / 207	−8.3
Sum, rounded to a whole point						−1

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	22,591	2487.2	− 2436	51.2	× 56 / 214	13.4
4	22,592	2512.2	− 2485	27.2	× 55 / 214	7
5	22,594	2518.6	− 2528	−9.4	× 45 / 214	−2
6	22,597	2535.8	− 2552	−16.2	× 58 / 214	−4.4
Sum, rounded to a whole point						14

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	22,587	2407.1	− 2436	−28.9	× 56 / 215	−7.5
4	22,589	2512.7	− 2485	27.7	× 59 / 215	7.6
5	22,591	2509.2	− 2528	−18.8	× 53 / 215	−4.6
6	22,593	2560.4	− 2552	8.4	× 47 / 215	1.8
Sum, rounded to a whole point						−3

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	22,770	2427.4	− 2436	−8.6	× 58 / 219	−2.3
4	22,771	2503.1	− 2485	18.1	× 55 / 219	4.5
5	22,772	2521.6	− 2528	−6.4	× 53 / 219	−1.5
6	22,773	2543.8	− 2552	−8.2	× 53 / 219	−2
Sum, rounded to a whole point						−1

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	22,737	2409.4	− 2436	−26.6	× 71 / 230	−8.2
4	22,738	2451.8	− 2485	−33.2	× 63 / 230	−9.1
5	22,739	2479.2	− 2528	−48.8	× 44 / 230	−9.3
6	22,740	2541.3	− 2552	−10.7	× 52 / 230	−2.4
Sum, rounded to a whole point						−29

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	22,712	2406.5	− 2436	−29.5	× 54 / 222	−7.2
4	22,713	2462.4	− 2485	−22.6	× 69 / 222	−7
5	22,714	2474.2	− 2528	−53.8	× 57 / 222	−13.8
6	22,715	2525.6	− 2552	−26.4	× 42 / 222	−5
Sum, rounded to a whole point						−33

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	22,572	2406.9	− 2436	−29.1	× 56 / 227	−7.2
4	22,573	2460.0	− 2485	−25	× 53 / 227	−5.8
5	22,574	2466.5	− 2528	−61.5	× 65 / 227	−17.6
6	22,575	2509.6	− 2552	−42.4	× 53 / 227	−9.9
Sum, rounded to a whole point						−41

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	22,481	2363.3	− 2436	−72.7	× 45 / 214	−15.3
4	22,482	2460.1	− 2485	−24.9	× 52 / 214	−6.1
5	22,483	2468.3	− 2528	−59.7	× 49 / 214	−13.7
6	22,484	2503.8	− 2552	−48.2	× 68 / 214	−15.3
Sum, rounded to a whole point						−50

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −12, −1, 14, −3, −1, −29, −33, −41, −50 → −17.3
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 11 · 2016→2017: 15 · 2017→2018: 17 · 2018→2019: 2 · 2019→2022: 28 · 2022→2023: 4 · 2023→2024: 8 · 2024→2025: 9 → average 11.8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 11.8 × 2.66 = 31.4. Upper limit 14.1, lower limit −48.7.

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.