Vinland 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	10,923	2390.6	− 2436	−45.4	× 97 / 315	−14
4	10,925	2408.8	− 2485	−76.2	× 84 / 315	−20.3
5	10,927	2392.8	− 2528	−135.2	× 80 / 315	−34.3
6	10,929	2436.5	− 2552	−115.5	× 54 / 315	−19.8
Sum, rounded to a whole point						−88

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	9,940	2379.3	− 2436	−56.7	× 88 / 326	−15.3
4	9,943	2404.0	− 2485	−81	× 84 / 326	−20.9
5	9,945	2423.1	− 2528	−104.9	× 73 / 326	−23.5
6	9,946	2422.6	− 2552	−129.4	× 81 / 326	−32.2
Sum, rounded to a whole point						−92

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,268	2397.1	− 2436	−38.9	× 84 / 333	−9.8
4	10,270	2407.0	− 2485	−78	× 91 / 333	−21.3
5	10,272	2434.8	− 2528	−93.2	× 81 / 333	−22.7
6	10,274	2487.1	− 2552	−64.9	× 77 / 333	−15
Sum, rounded to a whole point						−69

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,287	2390.0	− 2436	−46	× 82 / 334	−11.3
4	10,288	2400.4	− 2485	−84.6	× 88 / 334	−22.3
5	10,291	2432.1	− 2528	−95.9	× 84 / 334	−24.1
6	10,292	2454.8	− 2552	−97.2	× 80 / 334	−23.3
Sum, rounded to a whole point						−81

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,367	2402.7	− 2436	−33.3	× 75 / 307	−8.1
4	10,368	2422.7	− 2485	−62.3	× 74 / 307	−15
5	10,369	2442.0	− 2528	−86	× 79 / 307	−22.1
6	10,370	2457.3	− 2552	−94.7	× 79 / 307	−24.4
Sum, rounded to a whole point						−70

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,360	2365.2	− 2436	−70.8	× 65 / 244	−18.9
4	10,361	2404.7	− 2485	−80.3	× 64 / 244	−21.1
5	10,362	2426.2	− 2528	−101.8	× 60 / 244	−25
6	10,363	2458.7	− 2552	−93.3	× 55 / 244	−21
Sum, rounded to a whole point						−86

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,348	2389.8	− 2436	−46.2	× 73 / 284	−11.9
4	10,349	2402.6	− 2485	−82.4	× 72 / 284	−20.9
5	10,350	2425.2	− 2528	−102.8	× 73 / 284	−26.4
6	10,351	2434.2	− 2552	−117.8	× 66 / 284	−27.4
Sum, rounded to a whole point						−87

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,314	2398.9	− 2436	−37.1	× 67 / 285	−8.7
4	10,315	2415.6	− 2485	−69.4	× 76 / 285	−18.5
5	10,316	2371.4	− 2528	−156.6	× 69 / 285	−37.9
6	10,317	2458.9	− 2552	−93.1	× 73 / 285	−23.8
Sum, rounded to a whole point						−89

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,291	2356.6	− 2436	−79.4	× 80 / 292	−21.8
4	10,292	2411.2	− 2485	−73.8	× 71 / 292	−17.9
5	10,293	2414.9	− 2528	−113.1	× 71 / 292	−27.5
6	10,294	2415.5	− 2552	−136.5	× 70 / 292	−32.7
Sum, rounded to a whole point						−100

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −88, −92, −69, −81, −70, −86, −87, −89, −100 → −84.7
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: 23 · 2017→2018: 12 · 2018→2019: 11 · 2019→2022: 16 · 2022→2023: 1 · 2023→2024: 2 · 2024→2025: 11 → average 10
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 10 × 2.66 = 26.6. Upper limit −58.1, lower limit −111.3.

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.