Edison 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	66,661	2419.3	− 2436	−16.7	× 107 / 584	−3.1
4	66,662	2479.7	− 2485	−5.3	× 121 / 584	−1.1
5	66,665	2462.0	− 2528	−66	× 124 / 584	−14
6	66,666	2504.0	− 2552	−48	× 125 / 584	−10.3
7	66,669	2608.0	− 2567	41	× 56 / 584	3.9
8	66,670	2603.0	− 2586	17	× 51 / 584	1.5
Sum, rounded to a whole point						−23

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	61,834	2445.8	− 2436	9.8	× 89 / 512	1.7
4	61,835	2463.1	− 2485	−21.9	× 95 / 512	−4.1
5	61,837	2489.2	− 2528	−38.8	× 105 / 512	−8
6	61,840	2501.2	− 2552	−50.8	× 110 / 512	−10.9
7	61,841	2584.7	− 2567	17.7	× 59 / 512	2
8	61,844	2628.6	− 2586	42.6	× 54 / 512	4.5
Sum, rounded to a whole point						−15

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	63,624	2420.1	− 2436	−15.9	× 98 / 512	−3
4	63,625	2509.2	− 2485	24.2	× 95 / 512	4.5
5	63,628	2500.0	− 2528	−28	× 99 / 512	−5.4
6	63,629	2533.2	− 2552	−18.8	× 108 / 512	−4
7	63,632	2562.8	− 2567	−4.2	× 56 / 512	−0.5
8	63,633	2608.9	− 2586	22.9	× 56 / 512	2.5
Sum, rounded to a whole point						−6

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	63,729	2426.0	− 2436	−10	× 95 / 532	−1.8
4	63,731	2488.0	− 2485	3	× 107 / 532	0.6
5	63,732	2533.2	− 2528	5.2	× 113 / 532	1.1
6	63,734	2524.9	− 2552	−27.1	× 108 / 532	−5.5
7	63,737	2632.0	− 2567	65	× 57 / 532	7
8	63,738	2637.1	− 2586	51.1	× 52 / 532	5
Sum, rounded to a whole point						6

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	64,001	2441.3	− 2436	5.3	× 95 / 530	1
4	64,002	2508.4	− 2485	23.4	× 102 / 530	4.5
5	64,003	2525.6	− 2528	−2.4	× 114 / 530	−0.5
6	64,004	2544.4	− 2552	−7.6	× 113 / 530	−1.6
7	64,005	2642.3	− 2567	75.3	× 53 / 530	7.5
8	64,006	2650.9	− 2586	64.9	× 53 / 530	6.5
Sum, rounded to a whole point						17

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	64,090	2466.7	− 2436	30.7	× 77 / 440	5.4
4	64,091	2500.2	− 2485	15.2	× 81 / 440	2.8
5	64,092	2512.3	− 2528	−15.7	× 81 / 440	−2.9
6	64,093	2531.6	− 2552	−20.4	× 99 / 440	−4.6
7	64,094	2600.9	− 2567	33.9	× 54 / 440	4.2
8	64,095	2613.4	− 2586	27.4	× 48 / 440	3
Sum, rounded to a whole point						8

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	64,073	2446.8	− 2436	10.8	× 96 / 457	2.3
4	64,074	2515.9	− 2485	30.9	× 84 / 457	5.7
5	64,075	2516.7	− 2528	−11.3	× 87 / 457	−2.2
6	64,076	2543.7	− 2552	−8.3	× 86 / 457	−1.6
7	64,077	2619.5	− 2567	52.5	× 53 / 457	6.1
8	64,078	2616.0	− 2586	30	× 51 / 457	3.3
Sum, rounded to a whole point						14

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	64,047	2453.4	− 2436	17.4	× 94 / 473	3.5
4	64,048	2507.7	− 2485	22.7	× 98 / 473	4.7
5	64,049	2533.6	− 2528	5.6	× 85 / 473	1
6	64,050	2537.2	− 2552	−14.8	× 88 / 473	−2.8
7	64,051	2624.7	− 2567	57.7	× 59 / 473	7.2
8	64,052	2648.2	− 2586	62.2	× 49 / 473	6.4
Sum, rounded to a whole point						20

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	63,809	2471.0	− 2436	35	× 87 / 482	6.3
4	63,810	2502.0	− 2485	17	× 92 / 482	3.2
5	63,811	2528.9	− 2528	0.9	× 98 / 482	0.2
6	63,812	2555.2	− 2552	3.2	× 88 / 482	0.6
7	63,813	2636.3	− 2567	69.3	× 60 / 482	8.6
8	63,814	2666.3	− 2586	80.3	× 57 / 482	9.5
Sum, rounded to a whole point						28

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −23, −15, −6, 6, 17, 8, 14, 20, 28 → 5.4
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: 9 · 2017→2018: 12 · 2018→2019: 11 · 2019→2022: 9 · 2022→2023: 6 · 2023→2024: 6 · 2024→2025: 8 → average 8.6
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 8.6 × 2.66 = 22.9. Upper limit 28.3, lower limit −17.5.

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.