Virginia R. Boris 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.

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	9,175	2467.0	− 2436	31	× 81 / 289	8.7
4	9,177	2534.2	− 2485	49.2	× 72 / 289	12.3
5	9,178	2547.0	− 2528	19	× 99 / 289	6.5
6	9,181	2534.1	− 2552	−17.9	× 37 / 289	−2.3
Sum, rounded to a whole point						25

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	9,196	2456.3	− 2436	20.3	× 82 / 360	4.6
4	9,199	2492.8	− 2485	7.8	× 93 / 360	2
5	9,200	2525.8	− 2528	−2.2	× 77 / 360	−0.5
6	9,203	2578.0	− 2552	26	× 108 / 360	7.8
Sum, rounded to a whole point						14

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	9,271	2467.8	− 2436	31.8	× 101 / 356	9
4	9,272	2500.1	− 2485	15.1	× 94 / 356	4
5	9,273	2522.9	− 2528	−5.1	× 86 / 356	−1.2
6	9,274	2594.9	− 2552	42.9	× 75 / 356	9
Sum, rounded to a whole point						21

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	9,228	2409.2	− 2436	−26.8	× 83 / 353	−6.3
4	9,229	2463.4	− 2485	−21.6	× 96 / 353	−5.9
5	9,230	2463.6	− 2528	−64.4	× 81 / 353	−14.8
6	9,231	2532.1	− 2552	−19.9	× 93 / 353	−5.2
Sum, rounded to a whole point						−32

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	9,210	2446.7	− 2436	10.7	× 119 / 427	3
4	9,211	2458.6	− 2485	−26.4	× 104 / 427	−6.4
5	9,212	2476.1	− 2528	−51.9	× 105 / 427	−12.8
6	9,213	2495.0	− 2552	−57	× 99 / 427	−13.2
Sum, rounded to a whole point						−29

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	9,160	2413.5	− 2436	−22.5	× 97 / 464	−4.7
4	9,161	2456.9	− 2485	−28.1	× 132 / 464	−8
5	9,162	2477.2	− 2528	−50.8	× 114 / 464	−12.5
6	9,163	2491.0	− 2552	−61	× 121 / 464	−15.9
Sum, rounded to a whole point						−41

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	9,129	2426.9	− 2436	−9.1	× 87 / 366	−2.2
4	9,130	2473.3	− 2485	−11.7	× 76 / 366	−2.4
5	9,131	2459.9	− 2528	−68.1	× 103 / 366	−19.2
6	9,132	2527.6	− 2552	−24.4	× 100 / 366	−6.7
Sum, rounded to a whole point						−30

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. 25, 14, 21, −32, −29, −41, −30 → −10.3
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2017→2018: 11 · 2018→2019: 7 · 2019→2022: 53 · 2022→2023: 3 · 2023→2024: 12 · 2024→2025: 11 → average 16.2
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 16.2 × 2.66 = 43.1. Upper limit 32.8, lower limit −53.4.

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 2016–17, 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.