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	11,905	2400.5	− 2432	−31.5	× 34 / 133	−8.1
4	11,906	2431.1	− 2473	−41.9	× 36 / 133	−11.3
5	11,909	2431.5	− 2502	−70.5	× 34 / 133	−18
6	11,910	2448.3	− 2531	−82.7	× 29 / 133	−18
Sum, rounded to a whole point						−55

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,914	2383.8	− 2432	−48.2	× 36 / 135	−12.9
4	10,916	2427.1	− 2473	−45.9	× 33 / 135	−11.2
5	10,919	2482.5	− 2502	−19.5	× 35 / 135	−5.1
6	10,921	2485.8	− 2531	−45.2	× 31 / 135	−10.4
Sum, rounded to a whole point						−40

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	11,244	2404.6	− 2432	−27.4	× 39 / 149	−7.2
4	11,246	2411.9	− 2473	−61.1	× 36 / 149	−14.8
5	11,248	2447.7	− 2502	−54.3	× 36 / 149	−13.1
6	11,251	2500.9	− 2531	−30.1	× 38 / 149	−7.7
Sum, rounded to a whole point						−43

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	11,278	2434.2	− 2432	2.2	× 32 / 136	0.5
4	11,281	2464.0	− 2473	−9	× 36 / 136	−2.4
5	11,282	2490.4	− 2502	−11.6	× 36 / 136	−3.1
6	11,285	2517.2	− 2531	−13.8	× 32 / 136	−3.2
Sum, rounded to a whole point						−8

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	11,364	2427.9	− 2432	−4.1	× 36 / 144	−1
4	11,365	2470.6	− 2473	−2.4	× 35 / 144	−0.6
5	11,366	2495.4	− 2502	−6.6	× 34 / 144	−1.6
6	11,367	2537.2	− 2531	6.2	× 39 / 144	1.7
Sum, rounded to a whole point						−1

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	11,335	2392.1	− 2432	−39.9	× 36 / 135	−10.6
4	11,336	2457.8	− 2473	−15.2	× 30 / 135	−3.4
5	11,337	2465.2	− 2502	−36.8	× 30 / 135	−8.2
6	11,338	2503.3	− 2531	−27.7	× 39 / 135	−8
Sum, rounded to a whole point						−30

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	11,322	2395.4	− 2432	−36.6	× 37 / 127	−10.7
4	11,323	2447.6	− 2473	−25.4	× 31 / 127	−6.2
5	11,324	2475.5	− 2502	−26.5	× 28 / 127	−5.8
6	11,325	2529.1	− 2531	−1.9	× 31 / 127	−0.5
Sum, rounded to a whole point						−23

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	11,277	2455.7	− 2432	23.7	× 43 / 145	7
4	11,278	2463.8	− 2473	−9.2	× 39 / 145	−2.5
5	11,279	2492.6	− 2502	−9.4	× 33 / 145	−2.1
6	11,280	2531.8	− 2531	0.8	× 30 / 145	0.2
Sum, rounded to a whole point						3

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	11,210	2424.9	− 2432	−7.1	× 22 / 135	−1.2
4	11,211	2473.0	− 2473	0	× 43 / 135	0
5	11,212	2455.0	− 2502	−47	× 39 / 135	−13.6
6	11,213	2526.0	− 2531	−5	× 31 / 135	−1.1
Sum, rounded to a whole point						−16

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −55, −40, −43, −8, −1, −30, −23, 3, −16 → −23.7
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 15 · 2016→2017: 3 · 2017→2018: 35 · 2018→2019: 7 · 2019→2022: 29 · 2022→2023: 7 · 2023→2024: 26 · 2024→2025: 19 → average 17.6
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 17.6 × 2.66 = 46.8. Upper limit 23.1, lower limit −70.5.

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.