Del Rey 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	68,555	2312.9	− 2432	−119.1	× 75 / 316	−28.3
4	68,556	2370.5	− 2473	−102.5	× 92 / 316	−29.8
5	68,559	2428.4	− 2502	−73.6	× 68 / 316	−15.8
6	68,560	2467.0	− 2531	−64	× 81 / 316	−16.4
Sum, rounded to a whole point						−90

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	63,502	2357.0	− 2432	−75	× 109 / 338	−24.2
4	63,503	2367.8	− 2473	−105.2	× 69 / 338	−21.5
5	63,506	2434.2	− 2502	−67.8	× 91 / 338	−18.3
6	63,507	2458.3	− 2531	−72.7	× 69 / 338	−14.8
Sum, rounded to a whole point						−79

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,300	2374.1	− 2432	−57.9	× 78 / 330	−13.7
4	65,301	2372.5	− 2473	−100.5	× 92 / 330	−28
5	65,304	2400.7	− 2502	−101.3	× 75 / 330	−23
6	65,306	2459.2	− 2531	−71.8	× 85 / 330	−18.5
Sum, rounded to a whole point						−83

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,384	2368.6	− 2432	−63.4	× 103 / 353	−18.5
4	65,385	2371.6	− 2473	−101.4	× 86 / 353	−24.7
5	65,388	2426.1	− 2502	−75.9	× 89 / 353	−19.1
6	65,389	2445.1	− 2531	−85.9	× 75 / 353	−18.3
Sum, rounded to a whole point						−81

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,768	2368.0	− 2432	−64	× 95 / 373	−16.3
4	65,769	2380.0	− 2473	−93	× 100 / 373	−24.9
5	65,770	2427.8	− 2502	−74.2	× 86 / 373	−17.1
6	65,771	2446.7	− 2531	−84.3	× 92 / 373	−20.8
Sum, rounded to a whole point						−79

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,829	2330.2	− 2432	−101.8	× 74 / 360	−20.9
4	65,830	2391.1	− 2473	−81.9	× 91 / 360	−20.7
5	65,831	2424.7	− 2502	−77.3	× 100 / 360	−21.5
6	65,832	2440.8	− 2531	−90.2	× 95 / 360	−23.8
Sum, rounded to a whole point						−87

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,836	2342.3	− 2432	−89.7	× 94 / 364	−23.2
4	65,837	2376.5	− 2473	−96.5	× 72 / 364	−19.1
5	65,838	2401.6	− 2502	−100.4	× 99 / 364	−27.3
6	65,839	2455.3	− 2531	−75.7	× 99 / 364	−20.6
Sum, rounded to a whole point						−90

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,804	2340.1	− 2432	−91.9	× 105 / 385	−25.1
4	65,805	2360.5	− 2473	−112.5	× 104 / 385	−30.4
5	65,806	2403.6	− 2502	−98.4	× 75 / 385	−19.2
6	65,807	2436.1	− 2531	−94.9	× 101 / 385	−24.9
Sum, rounded to a whole point						−100

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,564	2314.0	− 2432	−118	× 93 / 360	−30.5
4	65,565	2370.7	− 2473	−102.3	× 97 / 360	−27.6
5	65,566	2416.1	− 2502	−85.9	× 101 / 360	−24.1
6	65,567	2461.0	− 2531	−70	× 69 / 360	−13.4
Sum, rounded to a whole point						−96

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −90, −79, −83, −81, −79, −87, −90, −100, −96 → −87.2
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: 4 · 2017→2018: 2 · 2018→2019: 2 · 2019→2022: 8 · 2022→2023: 3 · 2023→2024: 10 · 2024→2025: 4 → average 5.5
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 5.5 × 2.66 = 14.6. Upper limit −72.6, lower limit −101.8.

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.