Cooper 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	93,475	2422.5	− 2432	−9.5	× 149 / 524	−2.7
4	93,476	2467.0	− 2473	−6	× 110 / 524	−1.3
5	93,479	2509.3	− 2502	7.3	× 139 / 524	1.9
6	93,480	2543.8	− 2531	12.8	× 126 / 524	3.1
Sum, rounded to a whole point						1

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	86,861	2428.2	− 2432	−3.8	× 128 / 508	−1
4	86,864	2466.5	− 2473	−6.5	× 139 / 508	−1.8
5	86,865	2519.5	− 2502	17.5	× 118 / 508	4.1
6	86,868	2551.2	− 2531	20.2	× 123 / 508	4.9
Sum, rounded to a whole point						6

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	89,308	2426.8	− 2432	−5.2	× 127 / 499	−1.3
4	89,311	2474.1	− 2473	1.1	× 116 / 499	0.3
5	89,313	2511.4	− 2502	9.4	× 144 / 499	2.7
6	89,315	2549.4	− 2531	18.4	× 112 / 499	4.1
Sum, rounded to a whole point						6

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	89,518	2450.2	− 2432	18.2	× 142 / 533	4.8
4	89,521	2489.2	− 2473	16.2	× 124 / 533	3.8
5	89,522	2531.3	− 2502	29.3	× 114 / 533	6.3
6	89,525	2552.4	− 2531	21.4	× 153 / 533	6.1
Sum, rounded to a whole point						21

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	90,121	2452.6	− 2432	20.6	× 116 / 506	4.7
4	90,122	2491.2	− 2473	18.2	× 149 / 506	5.4
5	90,123	2528.3	− 2502	26.3	× 129 / 506	6.7
6	90,124	2555.4	− 2531	24.4	× 112 / 506	5.4
Sum, rounded to a whole point						22

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	90,385	2447.2	− 2432	15.2	× 114 / 418	4.1
4	90,386	2483.6	− 2473	10.6	× 98 / 418	2.5
5	90,387	2500.4	− 2502	−1.6	× 99 / 418	−0.4
6	90,388	2537.8	− 2531	6.8	× 107 / 418	1.7
Sum, rounded to a whole point						8

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	90,277	2407.6	− 2432	−24.4	× 100 / 415	−5.9
4	90,278	2473.9	− 2473	0.9	× 119 / 415	0.3
5	90,279	2515.5	− 2502	13.5	× 98 / 415	3.2
6	90,280	2524.9	− 2531	−6.1	× 98 / 415	−1.4
Sum, rounded to a whole point						−4

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	90,226	2425.1	− 2432	−6.9	× 103 / 425	−1.7
4	90,227	2445.0	− 2473	−28	× 101 / 425	−6.7
5	90,228	2512.9	− 2502	10.9	× 123 / 425	3.2
6	90,229	2536.4	− 2531	5.4	× 98 / 425	1.2
Sum, rounded to a whole point						−4

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	89,910	2448.1	− 2432	16.1	× 103 / 423	3.9
4	89,911	2479.8	− 2473	6.8	× 100 / 423	1.6
5	89,912	2492.4	− 2502	−9.6	× 98 / 423	−2.2
6	89,913	2556.5	− 2531	25.5	× 122 / 423	7.4
Sum, rounded to a whole point						11

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. 1, 6, 6, 21, 22, 8, −4, −4, 11 → 7.4
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 5 · 2016→2017: 0 · 2017→2018: 15 · 2018→2019: 1 · 2019→2022: 14 · 2022→2023: 12 · 2023→2024: 0 · 2024→2025: 15 → average 7.8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 7.8 × 2.66 = 20.7. Upper limit 28.1, lower limit −13.3.

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.