Louis G. Zeyen 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	49,876	2407.2	− 2436	−28.8	× 38 / 169	−6.5
4	49,878	2439.4	− 2485	−45.6	× 47 / 169	−12.7
5	49,880	2453.0	− 2528	−75	× 36 / 169	−16
6	49,882	2503.8	− 2552	−48.2	× 48 / 169	−13.7
Sum, rounded to a whole point						−49

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	46,353	2419.9	− 2436	−16.1	× 39 / 159	−3.9
4	46,355	2472.9	− 2485	−12.1	× 36 / 159	−2.7
5	46,358	2482.4	− 2528	−45.6	× 49 / 159	−14.1
6	46,360	2534.9	− 2552	−17.1	× 35 / 159	−3.8
Sum, rounded to a whole point						−25

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	47,596	2434.1	− 2436	−1.9	× 37 / 166	−0.4
4	47,598	2471.5	− 2485	−13.5	× 45 / 166	−3.7
5	47,599	2500.2	− 2528	−27.8	× 35 / 166	−5.9
6	47,601	2536.1	− 2552	−15.9	× 49 / 166	−4.7
Sum, rounded to a whole point						−15

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	47,606	2431.3	− 2436	−4.7	× 30 / 134	−1.1
4	47,608	2480.7	− 2485	−4.3	× 33 / 134	−1.1
5	47,610	2529.5	− 2528	1.5	× 41 / 134	0.5
6	47,612	2544.3	− 2552	−7.7	× 30 / 134	−1.7
Sum, rounded to a whole point						−3

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	47,789	2437.6	− 2436	1.6	× 28 / 141	0.3
4	47,790	2475.1	− 2485	−9.9	× 38 / 141	−2.7
5	47,791	2501.7	− 2528	−26.3	× 35 / 141	−6.5
6	47,792	2548.4	− 2552	−3.6	× 40 / 141	−1
Sum, rounded to a whole point						−10

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	47,645	2430.4	− 2436	−5.6	× 29 / 141	−1.2
4	47,646	2448.2	− 2485	−36.8	× 33 / 141	−8.6
5	47,647	2506.6	− 2528	−21.4	× 47 / 141	−7.1
6	47,648	2541.5	− 2552	−10.5	× 32 / 141	−2.4
Sum, rounded to a whole point						−19

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	47,631	2433.5	− 2436	−2.5	× 27 / 135	−0.5
4	47,632	2459.3	− 2485	−25.7	× 32 / 135	−6.1
5	47,633	2496.5	− 2528	−31.5	× 30 / 135	−7
6	47,634	2553.2	− 2552	1.2	× 46 / 135	0.4
Sum, rounded to a whole point						−13

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	47,480	2445.3	− 2436	9.3	× 40 / 128	2.9
4	47,481	2521.9	− 2485	36.9	× 26 / 128	7.5
5	47,482	2480.0	− 2528	−48	× 30 / 128	−11.3
6	47,483	2557.8	− 2552	5.8	× 32 / 128	1.5
Sum, rounded to a whole point						1

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	47,236	2437.7	− 2436	1.7	× 38 / 143	0.5
4	47,237	2502.7	− 2485	17.7	× 38 / 143	4.7
5	47,238	2519.4	− 2528	−8.6	× 33 / 143	−2
6	47,239	2537.2	− 2552	−14.8	× 34 / 143	−3.5
Sum, rounded to a whole point						0

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −49, −25, −15, −3, −10, −19, −13, 1, 0 → −14.8
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 24 · 2016→2017: 10 · 2017→2018: 12 · 2018→2019: 7 · 2019→2022: 9 · 2022→2023: 6 · 2023→2024: 14 · 2024→2025: 1 → average 10.4
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 10.4 × 2.66 = 27.7. Upper limit 12.9, lower limit −42.5.

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.