Luther Burbank 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	44,417	2409.0	− 2432	−23	× 122 / 346	−8.1
4	44,420	2417.9	− 2473	−55.1	× 113 / 346	−18
5	44,421	2479.4	− 2502	−22.6	× 111 / 346	−7.3
Sum, rounded to a whole point						−33

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,144	2445.4	− 2432	13.4	× 87 / 337	3.5
4	41,145	2456.2	− 2473	−16.8	× 90 / 337	−4.5
5	41,148	2508.5	− 2502	6.5	× 73 / 337	1.4
6	41,149	2521.0	− 2531	−10	× 87 / 337	−2.6
Sum, rounded to a whole point						−2

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	42,166	2451.4	− 2432	19.4	× 96 / 344	5.4
4	42,168	2463.1	− 2473	−9.9	× 77 / 344	−2.2
5	42,170	2508.0	− 2502	6	× 98 / 344	1.7
6	42,173	2557.1	− 2531	26.1	× 73 / 344	5.5
Sum, rounded to a whole point						10

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	42,180	2465.8	− 2432	33.8	× 93 / 361	8.7
4	42,181	2468.0	− 2473	−5	× 97 / 361	−1.3
5	42,184	2552.5	− 2502	50.5	× 77 / 361	10.8
6	42,185	2528.1	− 2531	−2.9	× 94 / 361	−0.8
Sum, rounded to a whole point						17

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	42,317	2449.0	− 2432	17	× 81 / 348	4
4	42,318	2501.4	− 2473	28.4	× 91 / 348	7.4
5	42,319	2540.2	− 2502	38.2	× 92 / 348	10.1
6	42,320	2561.4	− 2531	30.4	× 84 / 348	7.3
Sum, rounded to a whole point						29

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	42,078	2422.0	− 2432	−10	× 96 / 379	−2.5
4	42,079	2485.4	− 2473	12.4	× 87 / 379	2.8
5	42,080	2514.4	− 2502	12.4	× 101 / 379	3.3
6	42,081	2499.4	− 2531	−31.6	× 95 / 379	−7.9
Sum, rounded to a whole point						−4

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	42,103	2424.2	− 2432	−7.8	× 95 / 376	−2
4	42,104	2439.2	− 2473	−33.8	× 104 / 376	−9.3
5	42,105	2507.8	− 2502	5.8	× 85 / 376	1.3
6	42,106	2528.1	− 2531	−2.9	× 92 / 376	−0.7
Sum, rounded to a whole point						−11

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,934	2405.2	− 2432	−26.8	× 97 / 410	−6.3
4	41,935	2454.4	− 2473	−18.6	× 112 / 410	−5.1
5	41,936	2494.9	− 2502	−7.1	× 105 / 410	−1.8
6	41,937	2527.4	− 2531	−3.6	× 96 / 410	−0.8
Sum, rounded to a whole point						−14

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,697	2400.5	− 2432	−31.5	× 99 / 406	−7.7
4	41,698	2452.1	− 2473	−20.9	× 94 / 406	−4.8
5	41,699	2523.3	− 2502	21.3	× 114 / 406	6
6	41,700	2506.9	− 2531	−24.1	× 99 / 406	−5.9
Sum, rounded to a whole point						−12

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −33, −2, 10, 17, 29, −4, −11, −14, −12 → −2.2
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 31 · 2016→2017: 12 · 2017→2018: 7 · 2018→2019: 12 · 2019→2022: 33 · 2022→2023: 7 · 2023→2024: 3 · 2024→2025: 2 → average 13.4
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 13.4 × 2.66 = 35.6. Upper limit 33.4, lower limit −37.8.

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.