Janie P. Abbott 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	34,458	2418.4	− 2436	−17.6	× 111 / 410	−4.8
4	34,460	2421.6	− 2485	−63.4	× 114 / 410	−17.6
5	34,462	2434.0	− 2528	−94	× 107 / 410	−24.5
6	34,464	2499.5	− 2552	−52.5	× 78 / 410	−10
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	32,222	2417.8	− 2436	−18.2	× 98 / 412	−4.3
4	32,223	2441.7	− 2485	−43.3	× 104 / 412	−10.9
5	32,226	2467.9	− 2528	−60.1	× 107 / 412	−15.6
6	32,228	2467.7	− 2552	−84.3	× 103 / 412	−21.1
Sum, rounded to a whole point						−52

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	32,774	2426.0	− 2436	−10	× 93 / 399	−2.3
4	32,775	2437.9	− 2485	−47.1	× 94 / 399	−11.1
5	32,777	2484.9	− 2528	−43.1	× 105 / 399	−11.3
6	32,779	2510.9	− 2552	−41.1	× 107 / 399	−11
Sum, rounded to a whole point						−36

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	32,790	2445.3	− 2436	9.3	× 89 / 380	2.2
4	32,792	2449.0	− 2485	−36	× 88 / 380	−8.3
5	32,794	2480.7	− 2528	−47.3	× 99 / 380	−12.3
6	32,796	2523.8	− 2552	−28.2	× 104 / 380	−7.7
Sum, rounded to a whole point						−26

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	32,964	2452.1	− 2436	16.1	× 94 / 353	4.3
4	32,965	2458.6	− 2485	−26.4	× 81 / 353	−6.1
5	32,966	2496.7	− 2528	−31.3	× 85 / 353	−7.5
6	32,967	2501.5	− 2552	−50.5	× 93 / 353	−13.3
Sum, rounded to a whole point						−23

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	32,167	2371.6	− 2436	−64.4	× 78 / 327	−15.4
4	32,168	2393.0	− 2485	−92	× 81 / 327	−22.8
5	32,169	2453.6	− 2528	−74.4	× 87 / 327	−19.8
6	32,170	2446.4	− 2552	−105.6	× 81 / 327	−26.2
Sum, rounded to a whole point						−84

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	32,919	2394.5	− 2436	−41.5	× 66 / 304	−9
4	32,920	2436.7	− 2485	−48.3	× 75 / 304	−11.9
5	32,921	2441.7	− 2528	−86.3	× 77 / 304	−21.9
6	32,922	2515.5	− 2552	−36.5	× 86 / 304	−10.3
Sum, rounded to a whole point						−53

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	32,972	2401.7	− 2436	−34.3	× 56 / 251	−7.7
4	32,973	2421.4	− 2485	−63.6	× 61 / 251	−15.5
5	32,974	2469.8	− 2528	−58.2	× 64 / 251	−14.8
6	32,975	2472.4	− 2552	−79.6	× 70 / 251	−22.2
Sum, rounded to a whole point						−60

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	32,830	2387.4	− 2436	−48.6	× 63 / 239	−12.8
4	32,831	2448.7	− 2485	−36.3	× 56 / 239	−8.5
5	32,832	2455.1	− 2528	−72.9	× 56 / 239	−17.1
6	32,833	2519.7	− 2552	−32.3	× 64 / 239	−8.6
Sum, rounded to a whole point						−47

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	32,693	2403.2	− 2436	−32.8	× 51 / 229	−7.3
4	32,694	2426.0	− 2485	−59	× 61 / 229	−15.7
5	32,695	2478.0	− 2528	−50	× 57 / 229	−12.4
6	32,696	2451.9	− 2552	−100.1	× 60 / 229	−26.2
Sum, rounded to a whole point						−62

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −57, −52, −36, −26, −23, −84, −53, −60, −47, −62 → −50
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 5 · 2016→2017: 16 · 2017→2018: 10 · 2018→2019: 3 · 2019→2021: 61 · 2021→2022: 31 · 2022→2023: 7 · 2023→2024: 13 · 2024→2025: 15 → average 17.9
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 17.9 × 2.66 = 47.6. Upper limit −2.4, lower limit −97.6.

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.