Isador Cohen Elementary: english

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	61,608	2399.4	− 2432	−32.6	× 33 / 157	−6.9
4	61,610	2400.6	− 2473	−72.4	× 48 / 157	−22.1
5	61,612	2432.3	− 2502	−69.7	× 36 / 157	−16
6	61,614	2479.6	− 2531	−51.4	× 40 / 157	−13.1
Sum, rounded to a whole point						−58

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	57,169	2382.2	− 2432	−49.8	× 33 / 147	−11.2
4	57,172	2416.7	− 2473	−56.3	× 35 / 147	−13.4
5	57,174	2446.4	− 2502	−55.6	× 40 / 147	−15.1
6	57,175	2476.6	− 2531	−54.4	× 39 / 147	−14.4
Sum, rounded to a whole point						−54

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,844	2402.9	− 2432	−29.1	× 35 / 143	−7.1
4	58,847	2406.3	− 2473	−66.7	× 42 / 143	−19.6
5	58,848	2450.8	− 2502	−51.2	× 31 / 143	−11.1
6	58,851	2478.5	− 2531	−52.5	× 35 / 143	−12.8
Sum, rounded to a whole point						−51

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,960	2410.6	− 2432	−21.4	× 37 / 157	−5
4	58,961	2431.4	− 2473	−41.6	× 47 / 157	−12.5
5	58,964	2432.1	− 2502	−69.9	× 47 / 157	−20.9
6	58,966	2503.6	− 2531	−27.4	× 26 / 157	−4.5
Sum, rounded to a whole point						−43

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	59,210	2392.4	− 2432	−39.6	× 45 / 168	−10.6
4	59,211	2427.9	− 2473	−45.1	× 36 / 168	−9.7
5	59,212	2454.7	− 2502	−47.3	× 43 / 168	−12.1
6	59,213	2467.6	− 2531	−63.4	× 44 / 168	−16.6
Sum, rounded to a whole point						−49

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	59,293	2331.8	− 2432	−100.2	× 41 / 173	−23.7
4	59,294	2329.7	− 2473	−143.3	× 47 / 173	−38.9
5	59,295	2385.4	− 2502	−116.6	× 41 / 173	−27.6
6	59,296	2469.0	− 2531	−62	× 44 / 173	−15.8
Sum, rounded to a whole point						−106

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	59,251	2317.0	− 2432	−115	× 26 / 141	−21.2
4	59,252	2405.4	− 2473	−67.6	× 39 / 141	−18.7
5	59,253	2379.5	− 2502	−122.5	× 39 / 141	−33.9
6	59,254	2408.0	− 2531	−123	× 37 / 141	−32.3
Sum, rounded to a whole point						−106

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	59,182	2318.3	− 2432	−113.7	× 42 / 139	−34.4
4	59,183	2370.9	− 2473	−102.1	× 30 / 139	−22
5	59,184	2437.7	− 2502	−64.3	× 35 / 139	−16.2
6	59,185	2427.5	− 2531	−103.5	× 32 / 139	−23.8
Sum, rounded to a whole point						−96

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,939	2302.9	− 2432	−129.1	× 47 / 178	−34.1
4	58,940	2362.3	− 2473	−110.7	× 50 / 178	−31.1
5	58,941	2392.8	− 2502	−109.2	× 36 / 178	−22.1
6	58,942	2468.8	− 2531	−62.2	× 45 / 178	−15.7
Sum, rounded to a whole point						−103

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −58, −54, −51, −43, −49, −106, −106, −96, −103 → −74
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 4 · 2016→2017: 3 · 2017→2018: 8 · 2018→2019: 6 · 2019→2022: 57 · 2022→2023: 0 · 2023→2024: 10 · 2024→2025: 7 → average 11.9
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 11.9 × 2.66 = 31.7. Upper limit −42.3, lower limit −105.7.

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.