Akers 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	18,624	2414.2	− 2436	−21.8	× 68 / 461	−3.2
4	18,627	2483.6	− 2485	−1.4	× 53 / 461	−0.2
5	18,628	2500.3	− 2528	−27.7	× 48 / 461	−2.9
6	18,631	2507.8	− 2552	−44.2	× 107 / 461	−10.3
7	18,632	2543.2	− 2567	−23.8	× 99 / 461	−5.1
8	18,635	2555.0	− 2586	−31	× 86 / 461	−5.8
Sum, rounded to a whole point						−27

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	17,623	2440.8	− 2436	4.8	× 68 / 446	0.7
4	17,626	2472.4	− 2485	−12.6	× 47 / 446	−1.3
5	17,628	2481.2	− 2528	−46.8	× 43 / 446	−4.5
6	17,629	2520.8	− 2552	−31.2	× 100 / 446	−7
7	17,631	2542.0	− 2567	−25	× 103 / 446	−5.8
8	17,633	2580.9	− 2586	−5.1	× 85 / 446	−1
Sum, rounded to a whole point						−19

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	17,964	2401.9	− 2436	−34.1	× 46 / 440	−3.6
4	17,966	2477.0	− 2485	−8	× 51 / 440	−0.9
5	17,968	2471.3	− 2528	−56.7	× 51 / 440	−6.6
6	17,970	2515.2	− 2552	−36.8	× 109 / 440	−9.1
7	17,971	2544.5	− 2567	−22.5	× 94 / 440	−4.8
8	17,973	2591.3	− 2586	5.3	× 89 / 440	1.1
Sum, rounded to a whole point						−24

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	17,976	2475.3	− 2436	39.3	× 62 / 459	5.3
4	17,979	2477.4	− 2485	−7.6	× 51 / 459	−0.8
5	17,980	2491.9	− 2528	−36.1	× 43 / 459	−3.4
6	17,983	2530.0	− 2552	−22	× 110 / 459	−5.3
7	17,984	2560.6	− 2567	−6.4	× 100 / 459	−1.4
8	17,987	2621.7	− 2586	35.7	× 93 / 459	7.2
Sum, rounded to a whole point						2

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,125	2426.7	− 2436	−9.3	× 64 / 495	−1.2
4	18,126	2512.4	− 2485	27.4	× 52 / 495	2.9
5	18,127	2532.6	− 2528	4.6	× 58 / 495	0.5
6	18,128	2518.2	− 2552	−33.8	× 122 / 495	−8.3
7	18,129	2544.4	− 2567	−22.6	× 102 / 495	−4.7
8	18,130	2580.0	− 2586	−6	× 97 / 495	−1.2
Sum, rounded to a whole point						−12

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,169	2426.5	− 2436	−9.5	× 71 / 482	−1.4
4	18,170	2488.6	− 2485	3.6	× 54 / 482	0.4
5	18,171	2531.3	− 2528	3.3	× 71 / 482	0.5
6	18,172	2506.5	− 2552	−45.5	× 97 / 482	−9.2
7	18,173	2553.9	− 2567	−13.1	× 97 / 482	−2.6
8	18,174	2578.7	− 2586	−7.3	× 92 / 482	−1.4
Sum, rounded to a whole point						−14

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,108	2449.7	− 2436	13.7	× 65 / 455	2
4	18,109	2501.2	− 2485	16.2	× 61 / 455	2.2
5	18,110	2529.3	− 2528	1.3	× 52 / 455	0.1
6	18,111	2509.0	− 2552	−43	× 104 / 455	−9.8
7	18,112	2499.3	− 2567	−67.7	× 87 / 455	−12.9
8	18,113	2602.3	− 2586	16.3	× 86 / 455	3.1
Sum, rounded to a whole point						−15

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,067	2446.7	− 2436	10.7	× 60 / 436	1.5
4	18,068	2513.5	− 2485	28.5	× 59 / 436	3.9
5	18,069	2524.7	− 2528	−3.3	× 50 / 436	−0.4
6	18,070	2539.4	− 2552	−12.6	× 96 / 436	−2.8
7	18,071	2548.3	− 2567	−18.7	× 91 / 436	−3.9
8	18,072	2539.4	− 2586	−46.6	× 80 / 436	−8.6
Sum, rounded to a whole point						−10

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,063	2448.6	− 2436	12.6	× 42 / 411	1.3
4	18,064	2528.1	− 2485	43.1	× 56 / 411	5.9
5	18,065	2537.2	− 2528	9.2	× 49 / 411	1.1
6	18,066	2539.5	− 2552	−12.5	× 102 / 411	−3.1
7	18,067	2559.0	− 2567	−8	× 83 / 411	−1.6
8	18,068	2594.5	− 2586	8.5	× 79 / 411	1.6
Sum, rounded to a whole point						5

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −27, −19, −24, 2, −12, −14, −15, −10, 5 → −12.7
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: 5 · 2017→2018: 26 · 2018→2019: 14 · 2019→2022: 2 · 2022→2023: 1 · 2023→2024: 5 · 2024→2025: 15 → average 9.5
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 9.5 × 2.66 = 25.3. Upper limit 12.6, lower limit −38.

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.