Suisun Valley 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	93,114	2445.0	− 2436	9	× 74 / 318	2.1
4	93,115	2466.0	− 2485	−19	× 77 / 318	−4.6
5	93,118	2485.8	− 2528	−42.2	× 45 / 318	−6
6	93,119	2552.5	− 2552	0.5	× 33 / 318	0.1
7	93,122	2526.3	− 2567	−40.7	× 33 / 318	−4.2
8	93,123	2557.1	− 2586	−28.9	× 56 / 318	−5.1
Sum, rounded to a whole point						−18

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	86,530	2456.3	− 2436	20.3	× 68 / 355	3.9
4	86,531	2494.9	− 2485	9.9	× 74 / 355	2.1
5	86,533	2479.1	− 2528	−48.9	× 81 / 355	−11.2
6	86,536	2508.8	− 2552	−43.2	× 47 / 355	−5.7
7	86,537	2508.5	− 2567	−58.5	× 42 / 355	−6.9
8	86,540	2539.5	− 2586	−46.5	× 43 / 355	−5.6
Sum, rounded to a whole point						−23

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	88,925	2488.0	− 2436	52	× 54 / 349	8
4	88,927	2508.9	− 2485	23.9	× 69 / 349	4.7
5	88,929	2536.7	− 2528	8.7	× 75 / 349	1.9
6	88,930	2531.3	− 2552	−20.7	× 74 / 349	−4.4
7	88,932	2544.6	− 2567	−22.4	× 44 / 349	−2.8
8	88,934	2544.2	− 2586	−41.8	× 33 / 349	−4
Sum, rounded to a whole point						3

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	89,143	2459.3	− 2436	23.3	× 56 / 410	3.2
4	89,144	2524.6	− 2485	39.6	× 63 / 410	6.1
5	89,147	2513.5	− 2528	−14.5	× 77 / 410	−2.7
6	89,148	2566.6	− 2552	14.6	× 88 / 410	3.1
7	89,151	2522.8	− 2567	−44.2	× 82 / 410	−8.8
8	89,152	2558.3	− 2586	−27.7	× 44 / 410	−3
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	89,752	2487.4	− 2436	51.4	× 60 / 435	7.1
4	89,753	2514.3	− 2485	29.3	× 56 / 435	3.8
5	89,754	2527.1	− 2528	−0.9	× 71 / 435	−0.1
6	89,755	2532.5	− 2552	−19.5	× 90 / 435	−4
7	89,756	2569.6	− 2567	2.6	× 76 / 435	0.5
8	89,757	2545.0	− 2586	−41	× 82 / 435	−7.7
Sum, rounded to a whole point						−1

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	90,012	2449.8	− 2436	13.8	× 46 / 307	2.1
4	90,013	2535.5	− 2485	50.5	× 53 / 307	8.7
5	90,014	2501.5	− 2528	−26.5	× 59 / 307	−5.1
6	90,015	2529.1	− 2552	−22.9	× 52 / 307	−3.9
7	90,016	2486.4	− 2567	−80.6	× 42 / 307	−11
8	90,017	2547.9	− 2586	−38.1	× 55 / 307	−6.8
Sum, rounded to a whole point						−16

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	89,906	2486.1	− 2436	50.1	× 62 / 333	9.3
4	89,907	2519.5	− 2485	34.5	× 47 / 333	4.9
5	89,908	2546.3	− 2528	18.3	× 53 / 333	2.9
6	89,909	2536.8	− 2552	−15.2	× 58 / 333	−2.6
7	89,910	2539.3	− 2567	−27.7	× 63 / 333	−5.2
8	89,911	2493.6	− 2586	−92.4	× 50 / 333	−13.9
Sum, rounded to a whole point						−5

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	89,865	2452.6	− 2436	16.6	× 51 / 345	2.5
4	89,866	2542.6	− 2485	57.6	× 57 / 345	9.5
5	89,867	2483.5	− 2528	−44.5	× 56 / 345	−7.2
6	89,868	2546.9	− 2552	−5.1	× 60 / 345	−0.9
7	89,869	2575.9	− 2567	8.9	× 60 / 345	1.5
8	89,870	2574.4	− 2586	−11.6	× 61 / 345	−2.1
Sum, rounded to a whole point						3

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	89,567	2462.8	− 2436	26.8	× 53 / 345	4.1
4	89,568	2503.9	− 2485	18.9	× 59 / 345	3.2
5	89,569	2504.8	− 2528	−23.2	× 58 / 345	−3.9
6	89,570	2479.9	− 2552	−72.1	× 60 / 345	−12.5
7	89,571	2581.5	− 2567	14.5	× 61 / 345	2.6
8	89,572	2564.8	− 2586	−21.2	× 54 / 345	−3.3
Sum, rounded to a whole point						−10

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −18, −23, 3, −2, −1, −16, −5, 3, −10 → −7.7
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 5 · 2016→2017: 26 · 2017→2018: 5 · 2018→2019: 1 · 2019→2022: 15 · 2022→2023: 11 · 2023→2024: 8 · 2024→2025: 13 → average 10.5
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 10.5 × 2.66 = 27.9. Upper limit 20.2, lower limit −35.6.

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.