City Of Angels: 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
6	29,212	2456.4	− 2552	−95.6	× 18 / 292	−5.9
7	29,213	2476.3	− 2567	−90.7	× 42 / 292	−13
8	29,216	2460.8	− 2586	−125.2	× 79 / 292	−33.9
11	29,218	2488.2	− 2628	−139.8	× 153 / 292	−73.3
Sum, rounded to a whole point						−126

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
4	27,429	2402.6	− 2485	−82.4	× 13 / 486	−2.2
6	27,433	2456.7	− 2552	−95.3	× 39 / 486	−7.6
7	27,436	2459.5	− 2567	−107.5	× 82 / 486	−18.1
8	27,437	2452.3	− 2586	−133.7	× 132 / 486	−36.3
11	27,440	2482.4	− 2628	−145.6	× 220 / 486	−65.9
Sum, rounded to a whole point						−130

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	28,012	2464.0	− 2552	−88	× 21 / 271	−6.8
7	28,014	2457.2	− 2567	−109.8	× 44 / 271	−17.8
8	28,016	2424.2	− 2586	−161.8	× 94 / 271	−56.1
11	28,019	2485.5	− 2628	−142.5	× 112 / 271	−58.9
Sum, rounded to a whole point						−140

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	28,063	2467.6	− 2552	−84.4	× 53 / 671	−6.7
7	28,065	2454.5	− 2567	−112.5	× 96 / 671	−16.1
8	28,067	2440.1	− 2586	−145.9	× 173 / 671	−37.6
11	28,069	2478.4	− 2628	−149.6	× 349 / 671	−77.8
Sum, rounded to a whole point						−138

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	28,243	2446.5	− 2528	−81.5	× 11 / 691	−1.3
6	28,244	2449.8	− 2552	−102.2	× 56 / 691	−8.3
7	28,245	2447.7	− 2567	−119.3	× 124 / 691	−21.4
8	28,246	2439.1	− 2586	−146.9	× 192 / 691	−40.8
11	28,247	2481.4	− 2628	−146.6	× 308 / 691	−65.3
Sum, rounded to a whole point						−137

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	27,458	2498.8	− 2628	−129.2	× 237 / 237	−129.2
Sum, rounded to a whole point						−129

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	28,276	2389.5	− 2436	−46.5	× 888 / 6171	−6.7
4	28,277	2416.7	− 2485	−68.3	× 866 / 6171	−9.6
5	28,278	2430.6	− 2528	−97.4	× 833 / 6171	−13.1
6	28,279	2443.1	− 2552	−108.9	× 821 / 6171	−14.5
7	28,280	2468.4	− 2567	−98.6	× 921 / 6171	−14.7
8	28,281	2462.9	− 2586	−123.1	× 914 / 6171	−18.2
11	28,282	2487.2	− 2628	−140.8	× 928 / 6171	−21.2
Sum, rounded to a whole point						−98

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	28,341	2436.5	− 2528	−91.5	× 12 / 636	−1.7
6	28,342	2448.9	− 2552	−103.1	× 43 / 636	−7
7	28,343	2469.4	− 2567	−97.6	× 110 / 636	−16.9
8	28,344	2443.5	− 2586	−142.5	× 137 / 636	−30.7
11	28,345	2479.3	− 2628	−148.7	× 334 / 636	−78.1
Sum, rounded to a whole point						−134

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	28,208	2439.7	− 2552	−112.3	× 50 / 585	−9.6
7	28,209	2469.8	− 2567	−97.2	× 96 / 585	−16
8	28,210	2462.4	− 2586	−123.6	× 157 / 585	−33.2
11	28,211	2501.8	− 2628	−126.2	× 282 / 585	−60.8
Sum, rounded to a whole point						−120

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	28,071	2428.5	− 2552	−123.5	× 27 / 423	−7.9
7	28,072	2467.2	− 2567	−99.8	× 66 / 423	−15.6
8	28,073	2453.1	− 2586	−132.9	× 86 / 423	−27
11	28,074	2483.8	− 2628	−144.2	× 244 / 423	−83.2
Sum, rounded to a whole point						−134

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −126, −130, −140, −138, −137, −129, −98, −134, −120, −134 → −128.6
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: 10 · 2017→2018: 2 · 2018→2019: 1 · 2019→2021: 8 · 2021→2022: 31 · 2022→2023: 36 · 2023→2024: 14 · 2024→2025: 14 → average 13.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 13.3 × 2.66 = 35.4. Upper limit −93.2, lower limit −164.

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.