Redwood 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	17,330	2363.4	− 2432	−68.6	× 120 / 562	−14.6
4	17,331	2372.3	− 2473	−100.7	× 146 / 562	−26.2
5	17,334	2416.4	− 2502	−85.6	× 141 / 562	−21.5
6	17,335	2458.4	− 2531	−72.6	× 155 / 562	−20
Sum, rounded to a whole point						−82

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	16,346	2380.5	− 2432	−51.5	× 101 / 499	−10.4
4	16,348	2379.9	− 2473	−93.1	× 125 / 499	−23.3
5	16,350	2421.2	− 2502	−80.8	× 138 / 499	−22.3
6	16,352	2458.7	− 2531	−72.3	× 135 / 499	−19.6
Sum, rounded to a whole point						−76

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	16,651	2374.7	− 2432	−57.3	× 144 / 494	−16.7
4	16,653	2422.4	− 2473	−50.6	× 100 / 494	−10.2
5	16,655	2432.6	− 2502	−69.4	× 125 / 494	−17.6
6	16,658	2456.2	− 2531	−74.8	× 125 / 494	−18.9
Sum, rounded to a whole point						−63

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	16,675	2387.5	− 2432	−44.5	× 117 / 460	−11.3
4	16,676	2409.9	− 2473	−63.1	× 122 / 460	−16.7
5	16,679	2463.6	− 2502	−38.4	× 96 / 460	−8
6	16,680	2466.0	− 2531	−65	× 125 / 460	−17.7
Sum, rounded to a whole point						−54

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	16,804	2387.6	− 2432	−44.4	× 119 / 466	−11.3
4	16,805	2441.5	− 2473	−31.5	× 120 / 466	−8.1
5	16,806	2455.5	− 2502	−46.5	× 133 / 466	−13.3
6	16,807	2497.0	− 2531	−34	× 94 / 466	−6.9
Sum, rounded to a whole point						−40

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	16,404	2338.8	− 2432	−93.2	× 99 / 453	−20.4
4	16,405	2372.3	− 2473	−100.7	× 111 / 453	−24.7
5	16,406	2415.6	− 2502	−86.4	× 120 / 453	−22.9
6	16,407	2463.8	− 2531	−67.2	× 123 / 453	−18.2
Sum, rounded to a whole point						−86

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	16,848	2352.4	− 2432	−79.6	× 109 / 441	−19.7
4	16,849	2414.0	− 2473	−59	× 105 / 441	−14
5	16,850	2440.9	− 2502	−61.1	× 113 / 441	−15.7
6	16,851	2472.9	− 2531	−58.1	× 114 / 441	−15
Sum, rounded to a whole point						−64

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	16,790	2343.3	− 2432	−88.7	× 94 / 415	−20.1
4	16,791	2386.8	− 2473	−86.2	× 104 / 415	−21.6
5	16,792	2432.2	− 2502	−69.8	× 103 / 415	−17.3
6	16,793	2469.9	− 2531	−61.1	× 114 / 415	−16.8
Sum, rounded to a whole point						−76

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	16,743	2377.7	− 2432	−54.3	× 82 / 379	−11.7
4	16,744	2410.6	− 2473	−62.4	× 91 / 379	−15
5	16,745	2440.3	− 2502	−61.7	× 101 / 379	−16.4
6	16,746	2476.5	− 2531	−54.5	× 105 / 379	−15.1
Sum, rounded to a whole point						−58

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	16,724	2378.8	− 2432	−53.2	× 68 / 360	−10
4	16,725	2410.5	− 2473	−62.5	× 89 / 360	−15.5
5	16,726	2436.5	− 2502	−65.5	× 83 / 360	−15.1
6	16,727	2468.8	− 2531	−62.2	× 120 / 360	−20.7
Sum, rounded to a whole point						−61

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −82, −76, −63, −54, −40, −86, −64, −76, −58, −61 → −66
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 6 · 2016→2017: 13 · 2017→2018: 9 · 2018→2019: 14 · 2019→2021: 46 · 2021→2022: 22 · 2022→2023: 12 · 2023→2024: 18 · 2024→2025: 3 → average 15.9
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 15.9 × 2.66 = 42.3. Upper limit −23.7, lower limit −108.3.

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.