Culverdale Elementary: english

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	53,107	2425.4	− 2432	−6.6	× 79 / 409	−1.3
4	53,109	2438.0	− 2473	−35	× 86 / 409	−7.4
5	53,111	2490.9	− 2502	−11.1	× 129 / 409	−3.5
6	53,113	2517.0	− 2531	−14	× 115 / 409	−3.9
Sum, rounded to a whole point						−16

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	49,347	2419.5	− 2432	−12.5	× 77 / 380	−2.5
4	49,350	2485.3	− 2473	12.3	× 73 / 380	2.4
5	49,351	2494.3	− 2502	−7.7	× 90 / 380	−1.8
6	49,354	2542.1	− 2531	11.1	× 140 / 380	4.1
Sum, rounded to a whole point						2

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	50,712	2395.8	− 2432	−36.2	× 90 / 370	−8.8
4	50,713	2412.2	− 2473	−60.8	× 86 / 370	−14.1
5	50,716	2494.6	− 2502	−7.4	× 80 / 370	−1.6
6	50,717	2509.8	− 2531	−21.2	× 114 / 370	−6.5
Sum, rounded to a whole point						−31

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	50,748	2426.2	− 2432	−5.8	× 85 / 345	−1.4
4	50,750	2481.8	− 2473	8.8	× 79 / 345	2
5	50,752	2464.1	− 2502	−37.9	× 91 / 345	−10
6	50,754	2521.1	− 2531	−9.9	× 90 / 345	−2.6
Sum, rounded to a whole point						−12

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	50,950	2426.0	− 2432	−6	× 85 / 372	−1.4
4	50,951	2471.2	− 2473	−1.8	× 109 / 372	−0.5
5	50,952	2492.5	− 2502	−9.5	× 85 / 372	−2.2
6	50,953	2511.7	− 2531	−19.3	× 93 / 372	−4.8
Sum, rounded to a whole point						−9

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	50,876	2409.0	− 2432	−23	× 73 / 312	−5.4
4	50,877	2457.7	− 2473	−15.3	× 78 / 312	−3.8
5	50,878	2488.2	− 2502	−13.8	× 77 / 312	−3.4
6	50,879	2563.5	− 2531	32.5	× 84 / 312	8.8
Sum, rounded to a whole point						−4

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	50,842	2425.3	− 2432	−6.7	× 66 / 328	−1.3
4	50,843	2464.1	− 2473	−8.9	× 90 / 328	−2.4
5	50,844	2508.2	− 2502	6.2	× 71 / 328	1.3
6	50,845	2544.8	− 2531	13.8	× 101 / 328	4.2
Sum, rounded to a whole point						2

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	50,703	2420.9	− 2432	−11.1	× 71 / 311	−2.5
4	50,704	2468.8	− 2473	−4.2	× 72 / 311	−1
5	50,705	2489.2	− 2502	−12.8	× 83 / 311	−3.4
6	50,706	2578.6	− 2531	47.6	× 85 / 311	13
Sum, rounded to a whole point						6

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	50,465	2426.1	− 2432	−5.9	× 78 / 311	−1.5
4	50,466	2463.9	− 2473	−9.1	× 71 / 311	−2.1
5	50,467	2508.6	− 2502	6.6	× 79 / 311	1.7
6	50,468	2580.9	− 2531	49.9	× 83 / 311	13.3
Sum, rounded to a whole point						11

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −16, 2, −31, −12, −9, −4, 2, 6, 11 → −5.7
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 18 · 2016→2017: 33 · 2017→2018: 19 · 2018→2019: 3 · 2019→2022: 5 · 2022→2023: 6 · 2023→2024: 4 · 2024→2025: 5 → average 11.6
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 11.6 × 2.66 = 30.9. Upper limit 25.2, lower limit −36.6.

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.