Lauderbach (J. Calvin) 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	70,646	2394.4	− 2432	−37.6	× 139 / 421	−12.4
4	70,649	2435.4	− 2473	−37.6	× 100 / 421	−8.9
5	70,650	2475.7	− 2502	−26.3	× 90 / 421	−5.6
6	70,653	2532.4	− 2531	1.4	× 92 / 421	0.3
Sum, rounded to a whole point						−27

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,475	2416.1	− 2432	−15.9	× 117 / 441	−4.2
4	65,477	2454.0	− 2473	−19	× 136 / 441	−5.9
5	65,480	2475.2	− 2502	−26.8	× 92 / 441	−5.6
6	65,481	2529.7	− 2531	−1.3	× 96 / 441	−0.3
Sum, rounded to a whole point						−16

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,291	2423.8	− 2432	−8.2	× 112 / 449	−2
4	67,294	2454.0	− 2473	−19	× 115 / 449	−4.9
5	67,295	2488.5	− 2502	−13.5	× 132 / 449	−4
6	67,298	2495.8	− 2531	−35.2	× 90 / 449	−7.1
Sum, rounded to a whole point						−18

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,397	2439.3	− 2432	7.3	× 92 / 454	1.5
4	67,400	2453.2	− 2473	−19.8	× 117 / 454	−5.1
5	67,401	2495.1	− 2502	−6.9	× 116 / 454	−1.8
6	67,404	2508.8	− 2531	−22.2	× 129 / 454	−6.3
Sum, rounded to a whole point						−12

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,908	2414.3	− 2432	−17.7	× 103 / 442	−4.1
4	67,909	2457.7	− 2473	−15.3	× 103 / 442	−3.6
5	67,910	2475.0	− 2502	−27	× 115 / 442	−7
6	67,911	2525.1	− 2531	−5.9	× 121 / 442	−1.6
Sum, rounded to a whole point						−16

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	68,036	2391.3	− 2432	−40.7	× 84 / 372	−9.2
4	68,037	2394.6	− 2473	−78.4	× 97 / 372	−20.4
5	68,038	2436.7	− 2502	−65.3	× 87 / 372	−15.3
6	68,039	2506.8	− 2531	−24.2	× 104 / 372	−6.8
Sum, rounded to a whole point						−52

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	68,054	2377.6	− 2432	−54.4	× 90 / 373	−13.1
4	68,055	2418.0	− 2473	−55	× 90 / 373	−13.3
5	68,056	2455.0	− 2502	−47	× 97 / 373	−12.2
6	68,057	2489.7	− 2531	−41.3	× 96 / 373	−10.6
Sum, rounded to a whole point						−49

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	68,048	2376.9	− 2432	−55.1	× 106 / 382	−15.3
4	68,049	2417.4	− 2473	−55.6	× 91 / 382	−13.2
5	68,050	2472.0	− 2502	−30	× 88 / 382	−6.9
6	68,051	2498.4	− 2531	−32.6	× 97 / 382	−8.3
Sum, rounded to a whole point						−44

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	67,816	2385.6	− 2432	−46.4	× 109 / 402	−12.6
4	67,817	2422.7	− 2473	−50.3	× 109 / 402	−13.6
5	67,818	2484.8	− 2502	−17.2	× 92 / 402	−3.9
6	67,819	2520.8	− 2531	−10.2	× 92 / 402	−2.3
Sum, rounded to a whole point						−32

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −27, −16, −18, −12, −16, −52, −49, −44, −32 → −29.6
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 11 · 2016→2017: 2 · 2017→2018: 6 · 2018→2019: 4 · 2019→2022: 36 · 2022→2023: 3 · 2023→2024: 5 · 2024→2025: 12 → average 9.9
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 9.9 × 2.66 = 26.3. Upper limit −3.3, lower limit −55.9.

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.