Jackson 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	58,230	2399.0	− 2436	−37	× 136 / 493	−10.2
4	58,232	2435.0	− 2485	−50	× 109 / 493	−11.1
5	58,234	2454.4	− 2528	−73.6	× 131 / 493	−19.6
6	58,236	2483.0	− 2552	−69	× 117 / 493	−16.4
Sum, rounded to a whole point						−57

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	54,053	2423.4	− 2436	−12.6	× 109 / 486	−2.8
4	54,056	2434.6	− 2485	−50.4	× 140 / 486	−14.5
5	54,058	2464.4	− 2528	−63.6	× 112 / 486	−14.7
6	54,059	2483.8	− 2552	−68.2	× 125 / 486	−17.5
Sum, rounded to a whole point						−50

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	55,632	2390.0	− 2436	−46	× 127 / 499	−11.7
4	55,635	2450.4	− 2485	−34.6	× 117 / 499	−8.1
5	55,637	2457.4	− 2528	−70.6	× 140 / 499	−19.8
6	55,638	2468.1	− 2552	−83.9	× 115 / 499	−19.3
Sum, rounded to a whole point						−59

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	55,730	2423.2	− 2436	−12.8	× 81 / 469	−2.2
4	55,731	2428.5	− 2485	−56.5	× 130 / 469	−15.7
5	55,734	2476.4	− 2528	−51.6	× 113 / 469	−12.4
6	55,735	2481.8	− 2552	−70.2	× 145 / 469	−21.7
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	55,989	2397.0	− 2436	−39	× 89 / 408	−8.5
4	55,990	2447.7	− 2485	−37.3	× 77 / 408	−7
5	55,991	2449.6	− 2528	−78.4	× 128 / 408	−24.6
6	55,992	2501.5	− 2552	−50.5	× 114 / 408	−14.1
Sum, rounded to a whole point						−54

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	56,053	2415.8	− 2436	−20.2	× 79 / 363	−4.4
4	56,054	2414.8	− 2485	−70.2	× 93 / 363	−18
5	56,055	2436.2	− 2528	−91.8	× 96 / 363	−24.3
6	56,056	2431.6	− 2552	−120.4	× 95 / 363	−31.5
Sum, rounded to a whole point						−78

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	56,002	2402.3	− 2436	−33.7	× 101 / 374	−9.1
4	56,003	2432.5	− 2485	−52.5	× 86 / 374	−12.1
5	56,004	2442.5	− 2528	−85.5	× 90 / 374	−20.6
6	56,005	2450.2	− 2552	−101.8	× 97 / 374	−26.4
Sum, rounded to a whole point						−68

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	55,878	2401.9	− 2436	−34.1	× 87 / 384	−7.7
4	55,879	2398.7	− 2485	−86.3	× 104 / 384	−23.4
5	55,880	2438.2	− 2528	−89.8	× 92 / 384	−21.5
6	55,881	2435.1	− 2552	−116.9	× 101 / 384	−30.7
Sum, rounded to a whole point						−83

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	55,642	2399.4	− 2436	−36.6	× 88 / 359	−9
4	55,643	2417.8	− 2485	−67.2	× 88 / 359	−16.5
5	55,644	2456.8	− 2528	−71.2	× 96 / 359	−19
6	55,645	2448.7	− 2552	−103.3	× 87 / 359	−25
Sum, rounded to a whole point						−70

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −57, −50, −59, −52, −54, −78, −68, −83, −70 → −63.4
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 7 · 2016→2017: 9 · 2017→2018: 7 · 2018→2019: 2 · 2019→2022: 24 · 2022→2023: 10 · 2023→2024: 15 · 2024→2025: 13 → average 10.9
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 10.9 × 2.66 = 29. Upper limit −34.4, lower limit −92.4.

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 2014–15, 2015–16, 2016–17, 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.