Westmore Oaks 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	105,496	2413.2	− 2436	−22.8	× 65 / 549	−2.7
4	105,497	2454.1	− 2485	−30.9	× 102 / 549	−5.7
5	105,500	2468.1	− 2528	−59.9	× 102 / 549	−11.1
6	105,501	2466.2	− 2552	−85.8	× 97 / 549	−15.2
7	105,504	2482.5	− 2567	−84.5	× 92 / 549	−14.2
8	105,505	2472.5	− 2586	−113.5	× 91 / 549	−18.8
Sum, rounded to a whole point						−68

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	98,008	2424.8	− 2436	−11.2	× 81 / 548	−1.7
4	98,010	2447.6	− 2485	−37.4	× 82 / 548	−5.6
5	98,011	2441.0	− 2528	−87	× 108 / 548	−17.1
6	98,013	2466.3	− 2552	−85.7	× 100 / 548	−15.6
7	98,016	2505.7	− 2567	−61.3	× 93 / 548	−10.4
8	98,018	2495.0	− 2586	−91	× 84 / 548	−13.9
Sum, rounded to a whole point						−64

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	100,873	2381.9	− 2436	−54.1	× 78 / 524	−8.1
4	100,875	2436.0	− 2485	−49	× 88 / 524	−8.2
5	100,876	2445.5	− 2528	−82.5	× 85 / 524	−13.4
6	100,878	2452.5	− 2552	−99.5	× 92 / 524	−17.5
7	100,880	2516.7	− 2567	−50.3	× 93 / 524	−8.9
8	100,882	2500.4	− 2586	−85.6	× 88 / 524	−14.4
Sum, rounded to a whole point						−70

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,028	2377.1	− 2436	−58.9	× 60 / 478	−7.4
4	101,029	2410.2	− 2485	−74.8	× 81 / 478	−12.7
5	101,032	2450.4	− 2528	−77.6	× 84 / 478	−13.6
6	101,033	2451.2	− 2552	−100.8	× 86 / 478	−18.1
7	101,036	2464.3	− 2567	−102.7	× 88 / 478	−18.9
8	101,037	2494.6	− 2586	−91.4	× 79 / 478	−15.1
Sum, rounded to a whole point						−86

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,675	2397.9	− 2436	−38.1	× 64 / 442	−5.5
4	101,676	2427.2	− 2485	−57.8	× 63 / 442	−8.2
5	101,677	2409.3	− 2528	−118.7	× 72 / 442	−19.3
6	101,678	2440.2	− 2552	−111.8	× 79 / 442	−20
7	101,679	2453.2	− 2567	−113.8	× 82 / 442	−21.1
8	101,680	2503.9	− 2586	−82.1	× 82 / 442	−15.2
Sum, rounded to a whole point						−89

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,952	2361.8	− 2436	−74.2	× 66 / 332	−14.8
4	101,953	2395.9	− 2485	−89.1	× 59 / 332	−15.8
5	101,954	2404.9	− 2528	−123.1	× 51 / 332	−18.9
6	101,955	2450.4	− 2552	−101.6	× 52 / 332	−15.9
7	101,956	2443.6	− 2567	−123.4	× 45 / 332	−16.7
8	101,957	2422.5	− 2586	−163.5	× 59 / 332	−29.1
Sum, rounded to a whole point						−111

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,772	2363.4	− 2436	−72.6	× 58 / 348	−12.1
4	101,773	2381.5	− 2485	−103.5	× 69 / 348	−20.5
5	101,774	2394.6	− 2528	−133.4	× 59 / 348	−22.6
6	101,775	2421.0	− 2552	−131	× 60 / 348	−22.6
7	101,776	2435.1	− 2567	−131.9	× 54 / 348	−20.5
8	101,777	2429.3	− 2586	−156.7	× 48 / 348	−21.6
Sum, rounded to a whole point						−120

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,659	2339.5	− 2436	−96.5	× 42 / 326	−12.4
4	101,660	2388.7	− 2485	−96.3	× 62 / 326	−18.3
5	101,661	2377.0	− 2528	−151	× 60 / 326	−27.8
6	101,662	2427.1	− 2552	−124.9	× 58 / 326	−22.2
7	101,663	2446.3	− 2567	−120.7	× 53 / 326	−19.6
8	101,664	2442.1	− 2586	−143.9	× 51 / 326	−22.5
Sum, rounded to a whole point						−123

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,325	2329.4	− 2436	−106.6	× 48 / 331	−15.5
4	101,326	2393.6	− 2485	−91.4	× 57 / 331	−15.7
5	101,327	2382.2	− 2528	−145.8	× 60 / 331	−26.4
6	101,328	2409.6	− 2552	−142.4	× 54 / 331	−23.2
7	101,329	2431.8	− 2567	−135.2	× 51 / 331	−20.8
8	101,330	2449.0	− 2586	−137	× 61 / 331	−25.2
Sum, rounded to a whole point						−127

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −68, −64, −70, −86, −89, −111, −120, −123, −127 → −95.3
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: 6 · 2017→2018: 16 · 2018→2019: 3 · 2019→2022: 22 · 2022→2023: 9 · 2023→2024: 3 · 2024→2025: 4 → average 8.4
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 8.4 × 2.66 = 22.3. Upper limit −73, lower limit −117.6.

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.