Los Angeles: math · Schoolio

The shaded band is this county'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	20,097	2411.5	− 2436	−24.5	× 114967 / 774166	−3.6
4	20,100	2448.8	− 2485	−36.2	× 112677 / 774166	−5.3
5	20,101	2473.6	− 2528	−54.4	× 112303 / 774166	−7.9
6	20,104	2495.9	− 2552	−56.1	× 110631 / 774166	−8
7	20,105	2508.1	− 2567	−58.9	× 109664 / 774166	−8.3
8	20,108	2523.9	− 2586	−62.1	× 111126 / 774166	−8.9
11	20,109	2554.1	− 2628	−73.9	× 102798 / 774166	−9.8
Sum, rounded to a whole point						−52

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	19,075	2423.0	− 2436	−13	× 111543 / 776272	−1.9
4	19,077	2457.5	− 2485	−27.5	× 114283 / 776272	−4
5	19,079	2480.1	− 2528	−47.9	× 112357 / 776272	−6.9
6	19,081	2500.5	− 2552	−51.5	× 110983 / 776272	−7.4
7	19,084	2516.1	− 2567	−50.9	× 111032 / 776272	−7.3
8	19,085	2531.8	− 2586	−54.2	× 110109 / 776272	−7.7
11	19,088	2563.3	− 2628	−64.7	× 105965 / 776272	−8.8
Sum, rounded to a whole point						−44

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	19,407	2427.4	− 2436	−8.6	× 110045 / 773231	−1.2
4	19,409	2460.1	− 2485	−24.9	× 110992 / 773231	−3.6
5	19,410	2482.1	− 2528	−45.9	× 113850 / 773231	−6.8
6	19,413	2501.8	− 2552	−50.2	× 110587 / 773231	−7.2
7	19,414	2517.3	− 2567	−49.7	× 110586 / 773231	−7.1
8	19,417	2532.1	− 2586	−53.9	× 110161 / 773231	−7.7
11	19,419	2560.0	− 2628	−68	× 107010 / 773231	−9.4
Sum, rounded to a whole point						−43

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	19,393	2430.6	− 2436	−5.4	× 103458 / 759272	−0.7
4	19,395	2466.7	− 2485	−18.3	× 109351 / 759272	−2.6
5	19,397	2488.1	− 2528	−39.9	× 110191 / 759272	−5.8
6	19,399	2507.1	− 2552	−44.9	× 111834 / 759272	−6.6
7	19,401	2518.1	− 2567	−48.9	× 109680 / 759272	−7.1
8	19,403	2534.1	− 2586	−51.9	× 109413 / 759272	−7.5
11	19,405	2557.0	− 2628	−71	× 105345 / 759272	−9.9
Sum, rounded to a whole point						−40

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	19,541	2435.0	− 2436	−1	× 104192 / 745934	−0.1
4	19,542	2471.6	− 2485	−13.4	× 102609 / 745934	−1.8
5	19,543	2494.4	− 2528	−33.6	× 108447 / 745934	−4.9
6	19,544	2511.2	− 2552	−40.8	× 108236 / 745934	−5.9
7	19,545	2522.9	− 2567	−44.1	× 110701 / 745934	−6.5
8	19,546	2534.5	− 2586	−51.5	× 108626 / 745934	−7.5
11	19,547	2560.9	− 2628	−67.1	× 103123 / 745934	−9.3
Sum, rounded to a whole point						−36

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	19,070	2404.3	− 2436	−31.7	× 14635 / 141582	−3.3
4	19,071	2443.0	− 2485	−42	× 15334 / 141582	−4.5
5	19,072	2468.2	− 2528	−59.8	× 15968 / 141582	−6.7
6	19,073	2487.0	− 2552	−65	× 16031 / 141582	−7.4
7	19,074	2506.1	− 2567	−60.9	× 15361 / 141582	−6.6
8	19,075	2505.9	− 2586	−80.1	× 15734 / 141582	−8.9
11	19,076	2570.8	− 2628	−57.2	× 48519 / 141582	−19.6
Sum, rounded to a whole point						−57

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	19,604	2419.8	− 2436	−16.2	× 93563 / 675761	−2.2
4	19,605	2454.5	− 2485	−30.5	× 95236 / 675761	−4.3
5	19,606	2475.5	− 2528	−52.5	× 97021 / 675761	−7.5
6	19,607	2493.9	− 2552	−58.1	× 96346 / 675761	−8.3
7	19,608	2506.0	− 2567	−61	× 94855 / 675761	−8.6
8	19,609	2515.3	− 2586	−70.7	× 100327 / 675761	−10.5
11	19,610	2539.4	− 2628	−88.6	× 98413 / 675761	−12.9
Sum, rounded to a whole point						−54

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	19,551	2425.5	− 2436	−10.5	× 91180 / 667827	−1.4
4	19,552	2463.7	− 2485	−21.3	× 93843 / 667827	−3
5	19,553	2481.1	− 2528	−46.9	× 95646 / 667827	−6.7
6	19,554	2494.8	− 2552	−57.2	× 95645 / 667827	−8.2
7	19,555	2509.9	− 2567	−57.1	× 95971 / 667827	−8.2
8	19,556	2516.1	− 2586	−69.9	× 95342 / 667827	−10
11	19,557	2543.6	− 2628	−84.4	× 100200 / 667827	−12.7
Sum, rounded to a whole point						−50

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	19,489	2429.2	− 2436	−6.8	× 89474 / 660554	−0.9
4	19,490	2466.2	− 2485	−18.8	× 91603 / 660554	−2.6
5	19,491	2488.0	− 2528	−40	× 94241 / 660554	−5.7
6	19,492	2499.4	− 2552	−52.6	× 94331 / 660554	−7.5
7	19,493	2513.5	− 2567	−53.5	× 95143 / 660554	−7.7
8	19,494	2524.3	− 2586	−61.7	× 96115 / 660554	−9
11	19,495	2547.8	− 2628	−80.2	× 99647 / 660554	−12.1
Sum, rounded to a whole point						−46

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	19,452	2432.3	− 2436	−3.7	× 89149 / 648566	−0.5
4	19,453	2471.1	− 2485	−13.9	× 89539 / 648566	−1.9
5	19,454	2493.1	− 2528	−34.9	× 91574 / 648566	−4.9
6	19,455	2509.4	− 2552	−42.6	× 92541 / 648566	−6.1
7	19,456	2523.8	− 2567	−43.2	× 93601 / 648566	−6.2
8	19,457	2534.8	− 2586	−51.2	× 94891 / 648566	−7.5
11	19,458	2560.0	− 2628	−68	× 97271 / 648566	−10.2
Sum, rounded to a whole point						−37

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −52, −44, −43, −40, −36, −57, −54, −50, −46, −37 → −45.9
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 8 · 2016→2017: 1 · 2017→2018: 3 · 2018→2019: 4 · 2019→2021: 21 · 2021→2022: 3 · 2022→2023: 4 · 2023→2024: 4 · 2024→2025: 9 → average 6.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 6.3 × 2.66 = 16.8. Upper limit −29.1, lower limit −62.7.

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 — for a county, the total across its schools. From 2014–15, 2015–16, 2016–17, 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.