Lake Los Angeles 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	24,839	2392.2	− 2436	−43.8	× 57 / 316	−7.9
4	24,842	2431.0	− 2485	−54	× 57 / 316	−9.7
5	24,843	2446.6	− 2528	−81.4	× 48 / 316	−12.4
6	24,846	2495.3	− 2552	−56.7	× 52 / 316	−9.3
7	24,847	2521.3	− 2567	−45.7	× 53 / 316	−7.7
8	24,850	2459.5	− 2586	−126.5	× 49 / 316	−19.6
Sum, rounded to a whole point						−67

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	23,136	2368.6	− 2436	−67.4	× 54 / 347	−10.5
4	23,138	2425.2	− 2485	−59.8	× 60 / 347	−10.3
5	23,140	2448.8	− 2528	−79.2	× 59 / 347	−13.5
6	23,141	2464.9	− 2552	−87.1	× 55 / 347	−13.8
7	23,144	2506.4	− 2567	−60.6	× 55 / 347	−9.6
8	23,145	2505.0	− 2586	−81	× 64 / 347	−14.9
Sum, rounded to a whole point						−73

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	23,586	2401.5	− 2436	−34.5	× 59 / 346	−5.9
4	23,587	2418.5	− 2485	−66.5	× 55 / 346	−10.6
5	23,589	2436.2	− 2528	−91.8	× 55 / 346	−14.6
6	23,592	2455.6	− 2552	−96.4	× 60 / 346	−16.7
7	23,594	2460.7	− 2567	−106.3	× 59 / 346	−18.1
8	23,596	2506.6	− 2586	−79.4	× 58 / 346	−13.3
Sum, rounded to a whole point						−79

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	23,606	2390.9	− 2436	−45.1	× 66 / 362	−8.2
4	23,607	2452.3	− 2485	−32.7	× 59 / 362	−5.3
5	23,610	2415.9	− 2528	−112.1	× 55 / 362	−17
6	23,611	2466.1	− 2552	−85.9	× 66 / 362	−15.7
7	23,613	2483.1	− 2567	−83.9	× 62 / 362	−14.4
8	23,616	2441.4	− 2586	−144.6	× 54 / 362	−21.6
Sum, rounded to a whole point						−82

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	23,780	2406.9	− 2436	−29.1	× 43 / 337	−3.7
4	23,781	2452.7	− 2485	−32.3	× 64 / 337	−6.1
5	23,782	2459.6	− 2528	−68.4	× 55 / 337	−11.2
6	23,783	2430.8	− 2552	−121.2	× 61 / 337	−21.9
7	23,784	2487.1	− 2567	−79.9	× 60 / 337	−14.2
8	23,785	2481.9	− 2586	−104.1	× 54 / 337	−16.7
Sum, rounded to a whole point						−74

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	23,723	2397.3	− 2436	−38.7	× 53 / 305	−6.7
4	23,724	2436.7	− 2485	−48.3	× 47 / 305	−7.4
5	23,725	2421.4	− 2528	−106.6	× 53 / 305	−18.5
6	23,726	2432.7	− 2552	−119.3	× 43 / 305	−16.8
7	23,727	2445.8	− 2567	−121.2	× 62 / 305	−24.6
8	23,728	2456.0	− 2586	−130	× 47 / 305	−20
Sum, rounded to a whole point						−94

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	23,686	2353.1	− 2436	−82.9	× 47 / 296	−13.2
4	23,687	2452.7	− 2485	−32.3	× 52 / 296	−5.7
5	23,688	2418.0	− 2528	−110	× 46 / 296	−17.1
6	23,689	2428.5	− 2552	−123.5	× 54 / 296	−22.5
7	23,690	2429.1	− 2567	−137.9	× 41 / 296	−19.1
8	23,691	2422.3	− 2586	−163.7	× 56 / 296	−31
Sum, rounded to a whole point						−109

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	23,538	2362.0	− 2436	−74	× 54 / 318	−12.6
4	23,539	2415.2	− 2485	−69.8	× 58 / 318	−12.7
5	23,540	2441.2	− 2528	−86.8	× 54 / 318	−14.7
6	23,541	2420.8	− 2552	−131.2	× 44 / 318	−18.2
7	23,542	2452.6	− 2567	−114.4	× 60 / 318	−21.6
8	23,543	2452.9	− 2586	−133.1	× 48 / 318	−20.1
Sum, rounded to a whole point						−100

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	23,439	2359.3	− 2436	−76.7	× 61 / 344	−13.6
4	23,440	2409.9	− 2485	−75.1	× 53 / 344	−11.6
5	23,441	2410.8	− 2528	−117.2	× 62 / 344	−21.1
6	23,442	2458.7	− 2552	−93.3	× 60 / 344	−16.3
7	23,443	2415.4	− 2567	−151.6	× 48 / 344	−21.2
8	23,444	2456.4	− 2586	−129.6	× 60 / 344	−22.6
Sum, rounded to a whole point						−106

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −67, −73, −79, −82, −74, −94, −109, −100, −106 → −87.1
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 6 · 2016→2017: 6 · 2017→2018: 3 · 2018→2019: 8 · 2019→2022: 20 · 2022→2023: 15 · 2023→2024: 9 · 2024→2025: 6 → average 9.1
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 9.1 × 2.66 = 24.2. Upper limit −62.9, lower limit −111.3.

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.