Chase Avenue 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	70,201	2402.0	− 2436	−34	× 140 / 384	−12.4
4	70,202	2425.1	− 2485	−59.9	× 118 / 384	−18.4
5	70,205	2429.9	− 2528	−98.1	× 126 / 384	−32.2
Sum, rounded to a whole point						−63

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,077	2379.6	− 2436	−56.4	× 109 / 376	−16.4
4	65,080	2437.7	− 2485	−47.3	× 143 / 376	−18
5	65,082	2454.2	− 2528	−73.8	× 124 / 376	−24.3
Sum, rounded to a whole point						−59

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	66,894	2393.5	− 2436	−42.5	× 104 / 339	−13
4	66,896	2400.0	− 2485	−85	× 104 / 339	−26.1
5	66,897	2458.8	− 2528	−69.2	× 131 / 339	−26.7
Sum, rounded to a whole point						−66

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	66,997	2382.3	− 2436	−53.7	× 135 / 346	−21
4	66,999	2408.5	− 2485	−76.5	× 106 / 346	−23.4
5	67,001	2436.9	− 2528	−91.1	× 105 / 346	−27.6
Sum, rounded to a whole point						−72

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,494	2384.2	− 2436	−51.8	× 138 / 387	−18.5
4	67,495	2410.3	− 2485	−74.7	× 135 / 387	−26.1
5	67,496	2445.2	− 2528	−82.8	× 114 / 387	−24.4
Sum, rounded to a whole point						−69

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,630	2344.2	− 2436	−91.8	× 110 / 305	−33.1
4	67,631	2394.4	− 2485	−90.6	× 88 / 305	−26.1
5	67,632	2416.0	− 2528	−112	× 107 / 305	−39.3
Sum, rounded to a whole point						−99

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,645	2332.8	− 2436	−103.2	× 109 / 384	−29.3
4	67,646	2374.2	− 2485	−110.8	× 103 / 384	−29.7
5	67,647	2417.6	− 2528	−110.4	× 100 / 384	−28.8
6	67,648	2402.9	− 2552	−149.1	× 72 / 384	−28
Sum, rounded to a whole point						−116

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,639	2329.2	− 2436	−106.8	× 121 / 442	−29.2
4	67,640	2374.1	− 2485	−110.9	× 118 / 442	−29.6
5	67,641	2390.2	− 2528	−137.8	× 113 / 442	−35.2
6	67,642	2387.0	− 2552	−165	× 90 / 442	−33.6
Sum, rounded to a whole point						−128

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,397	2353.0	− 2436	−83	× 102 / 432	−19.6
4	67,398	2378.0	− 2485	−107	× 119 / 432	−29.5
5	67,399	2394.9	− 2528	−133.1	× 114 / 432	−35.1
6	67,400	2392.0	− 2552	−160	× 97 / 432	−35.9
Sum, rounded to a whole point						−120

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −63, −59, −66, −72, −69, −99, −116, −128, −120 → −88
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: 7 · 2017→2018: 6 · 2018→2019: 3 · 2019→2022: 30 · 2022→2023: 17 · 2023→2024: 12 · 2024→2025: 8 → 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 −59, lower limit −117.

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.