Rohr (Fred H.) 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	70,587	2391.7	− 2436	−44.3	× 49 / 206	−10.5
4	70,589	2469.7	− 2485	−15.3	× 58 / 206	−4.3
5	70,591	2470.1	− 2528	−57.9	× 42 / 206	−11.8
6	70,593	2465.9	− 2552	−86.1	× 57 / 206	−23.8
Sum, rounded to a whole point						−50

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,416	2413.6	− 2436	−22.4	× 51 / 206	−5.5
4	65,417	2468.9	− 2485	−16.1	× 51 / 206	−4
5	65,420	2485.8	− 2528	−42.2	× 59 / 206	−12.1
6	65,422	2513.5	− 2552	−38.5	× 45 / 206	−8.4
Sum, rounded to a whole point						−30

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,231	2401.2	− 2436	−34.8	× 36 / 203	−6.2
4	67,233	2420.0	− 2485	−65	× 55 / 203	−17.6
5	67,235	2485.2	− 2528	−42.8	× 51 / 203	−10.8
6	67,238	2542.1	− 2552	−9.9	× 61 / 203	−3
Sum, rounded to a whole point						−38

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,338	2396.2	− 2436	−39.8	× 33 / 182	−7.2
4	67,340	2425.5	− 2485	−59.5	× 45 / 182	−14.7
5	67,342	2445.0	− 2528	−83	× 49 / 182	−22.3
6	67,344	2526.9	− 2552	−25.1	× 55 / 182	−7.6
Sum, rounded to a whole point						−52

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,853	2420.5	− 2436	−15.5	× 46 / 179	−4
4	67,854	2422.9	− 2485	−62.1	× 38 / 179	−13.2
5	67,855	2428.0	− 2528	−100	× 43 / 179	−24
6	67,856	2505.8	− 2552	−46.2	× 52 / 179	−13.4
Sum, rounded to a whole point						−55

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,981	2413.1	− 2436	−22.9	× 54 / 261	−4.7
4	67,982	2442.4	− 2485	−42.6	× 60 / 261	−9.8
5	67,983	2475.5	− 2528	−52.5	× 66 / 261	−13.3
6	67,984	2488.7	− 2552	−63.3	× 81 / 261	−19.6
Sum, rounded to a whole point						−47

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,999	2398.9	− 2436	−37.1	× 45 / 219	−7.6
4	68,000	2467.0	− 2485	−18	× 51 / 219	−4.2
5	68,001	2483.9	− 2528	−44.1	× 62 / 219	−12.5
6	68,002	2484.9	− 2552	−67.1	× 61 / 219	−18.7
Sum, rounded to a whole point						−43

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,993	2399.6	− 2436	−36.4	× 45 / 176	−9.3
4	67,994	2451.5	− 2485	−33.5	× 44 / 176	−8.4
5	67,995	2488.7	− 2528	−39.3	× 40 / 176	−8.9
6	67,996	2478.0	− 2552	−74	× 47 / 176	−19.8
Sum, rounded to a whole point						−46

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,761	2392.3	− 2436	−43.7	× 33 / 173	−8.3
4	67,762	2438.6	− 2485	−46.4	× 47 / 173	−12.6
5	67,763	2468.9	− 2528	−59.1	× 48 / 173	−16.4
6	67,764	2470.2	− 2552	−81.8	× 45 / 173	−21.3
Sum, rounded to a whole point						−59

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −50, −30, −38, −52, −55, −47, −43, −46, −59 → −46.7
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 20 · 2016→2017: 8 · 2017→2018: 14 · 2018→2019: 3 · 2019→2022: 8 · 2022→2023: 4 · 2023→2024: 3 · 2024→2025: 13 → average 9.1
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 9.1 × 2.66 = 24.2. Upper limit −22.5, lower limit −70.9.

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.