Edith B. Storey 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	11,181	2389.1	− 2436	−46.9	× 142 / 519	−12.8
4	11,183	2421.7	− 2485	−63.3	× 135 / 519	−16.5
5	11,185	2464.0	− 2528	−64	× 124 / 519	−15.3
6	11,187	2477.2	− 2552	−74.8	× 118 / 519	−17
Sum, rounded to a whole point						−62

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,199	2416.9	− 2436	−19.1	× 125 / 525	−4.5
4	10,201	2442.0	− 2485	−43	× 145 / 525	−11.9
5	10,203	2457.1	− 2528	−70.9	× 135 / 525	−18.2
6	10,205	2477.3	− 2552	−74.7	× 120 / 525	−17.1
Sum, rounded to a whole point						−52

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,527	2448.3	− 2436	12.3	× 135 / 528	3.1
4	10,528	2447.7	− 2485	−37.3	× 126 / 528	−8.9
5	10,531	2456.2	− 2528	−71.8	× 142 / 528	−19.3
6	10,532	2467.5	− 2552	−84.5	× 125 / 528	−20
Sum, rounded to a whole point						−45

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,539	2454.3	− 2436	18.3	× 120 / 517	4.2
4	10,541	2474.2	− 2485	−10.8	× 136 / 517	−2.8
5	10,543	2468.5	− 2528	−59.5	× 122 / 517	−14
6	10,545	2497.2	− 2552	−54.8	× 139 / 517	−14.7
Sum, rounded to a whole point						−27

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,619	2465.7	− 2436	29.7	× 137 / 519	7.8
4	10,620	2462.6	− 2485	−22.4	× 122 / 519	−5.3
5	10,621	2485.2	− 2528	−42.8	× 139 / 519	−11.5
6	10,622	2513.3	− 2552	−38.7	× 121 / 519	−9
Sum, rounded to a whole point						−18

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,612	2439.0	− 2436	3	× 110 / 470	0.7
4	10,613	2419.1	− 2485	−65.9	× 120 / 470	−16.8
5	10,614	2500.4	− 2528	−27.6	× 122 / 470	−7.2
6	10,615	2503.5	− 2552	−48.5	× 118 / 470	−12.2
Sum, rounded to a whole point						−35

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,600	2472.3	− 2436	36.3	× 61 / 301	7.4
4	10,601	2448.0	− 2485	−37	× 67 / 301	−8.2
5	10,602	2504.4	− 2528	−23.6	× 78 / 301	−6.1
6	10,603	2528.1	− 2552	−23.9	× 95 / 301	−7.5
Sum, rounded to a whole point						−15

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,566	2456.3	− 2436	20.3	× 71 / 300	4.8
4	10,567	2447.9	− 2485	−37.1	× 70 / 300	−8.7
5	10,568	2492.3	− 2528	−35.7	× 72 / 300	−8.6
6	10,569	2525.8	− 2552	−26.2	× 87 / 300	−7.6
Sum, rounded to a whole point						−20

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,543	2455.2	− 2436	19.2	× 63 / 271	4.5
4	10,544	2459.5	− 2485	−25.5	× 71 / 271	−6.7
5	10,545	2523.3	− 2528	−4.7	× 67 / 271	−1.2
6	10,546	2533.1	− 2552	−18.9	× 70 / 271	−4.9
Sum, rounded to a whole point						−8

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −62, −52, −45, −27, −18, −35, −15, −20, −8 → −31.3
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 10 · 2016→2017: 7 · 2017→2018: 18 · 2018→2019: 9 · 2019→2022: 17 · 2022→2023: 20 · 2023→2024: 5 · 2024→2025: 12 → average 12.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 12.3 × 2.66 = 32.7. Upper limit 1.4, lower limit −64.

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.