Louis G. Zeyen Elementary: english

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	49,877	2386.5	− 2432	−45.5	× 38 / 169	−10.2
4	49,879	2423.3	− 2473	−49.7	× 47 / 169	−13.8
5	49,881	2437.4	− 2502	−64.6	× 36 / 169	−13.8
6	49,883	2504.8	− 2531	−26.2	× 48 / 169	−7.4
Sum, rounded to a whole point						−45

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	46,354	2419.3	− 2432	−12.7	× 38 / 155	−3.1
4	46,356	2449.1	− 2473	−23.9	× 36 / 155	−5.6
5	46,357	2483.1	− 2502	−18.9	× 47 / 155	−5.7
6	46,359	2513.8	− 2531	−17.2	× 34 / 155	−3.8
Sum, rounded to a whole point						−18

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	47,595	2455.6	− 2432	23.6	× 36 / 165	5.1
4	47,597	2463.3	− 2473	−9.7	× 45 / 165	−2.6
5	47,600	2511.5	− 2502	9.5	× 35 / 165	2
6	47,602	2528.7	− 2531	−2.3	× 49 / 165	−0.7
Sum, rounded to a whole point						4

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	47,605	2432.2	− 2432	0.2	× 30 / 134	0
4	47,607	2456.7	− 2473	−16.3	× 33 / 134	−4
5	47,609	2522.2	− 2502	20.2	× 41 / 134	6.2
6	47,611	2551.3	− 2531	20.3	× 30 / 134	4.5
Sum, rounded to a whole point						7

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	47,784	2421.8	− 2432	−10.2	× 28 / 140	−2
4	47,785	2468.4	− 2473	−4.6	× 38 / 140	−1.2
5	47,786	2501.3	− 2502	−0.7	× 34 / 140	−0.2
6	47,787	2568.4	− 2531	37.4	× 40 / 140	10.7
Sum, rounded to a whole point						7

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	47,640	2428.8	− 2432	−3.2	× 29 / 140	−0.7
4	47,641	2423.0	− 2473	−50	× 33 / 140	−11.8
5	47,642	2503.8	− 2502	1.8	× 46 / 140	0.6
6	47,643	2506.7	− 2531	−24.3	× 32 / 140	−5.6
Sum, rounded to a whole point						−17

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	47,626	2436.4	− 2432	4.4	× 27 / 135	0.9
4	47,627	2433.8	− 2473	−39.2	× 32 / 135	−9.3
5	47,628	2510.2	− 2502	8.2	× 30 / 135	1.8
6	47,629	2561.7	− 2531	30.7	× 46 / 135	10.5
Sum, rounded to a whole point						4

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	47,475	2423.5	− 2432	−8.5	× 41 / 129	−2.7
4	47,476	2542.0	− 2473	69	× 26 / 129	13.9
5	47,477	2487.2	− 2502	−14.8	× 30 / 129	−3.4
6	47,478	2548.8	− 2531	17.8	× 32 / 129	4.4
Sum, rounded to a whole point						12

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	47,231	2421.2	− 2432	−10.8	× 38 / 142	−2.9
4	47,232	2498.1	− 2473	25.1	× 38 / 142	6.7
5	47,233	2527.8	− 2502	25.8	× 32 / 142	5.8
6	47,234	2518.7	− 2531	−12.3	× 34 / 142	−2.9
Sum, rounded to a whole point						7

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −45, −18, 4, 7, 7, −17, 4, 12, 7 → −4.3
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 27 · 2016→2017: 22 · 2017→2018: 3 · 2018→2019: 0 · 2019→2022: 24 · 2022→2023: 21 · 2023→2024: 8 · 2024→2025: 5 → average 13.8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 13.8 × 2.66 = 36.7. Upper limit 32.4, lower limit −41.

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.