Charleston 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	44,253	2409.6	− 2432	−22.4	× 54 / 214	−5.7
4	44,256	2443.4	− 2473	−29.6	× 49 / 214	−6.8
5	44,257	2483.2	− 2502	−18.8	× 54 / 214	−4.7
6	44,260	2526.2	− 2531	−4.8	× 57 / 214	−1.3
Sum, rounded to a whole point						−18

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	40,954	2389.7	− 2432	−42.3	× 55 / 220	−10.6
4	40,955	2460.4	− 2473	−12.6	× 63 / 220	−3.6
5	40,957	2464.1	− 2502	−37.9	× 48 / 220	−8.3
6	40,959	2524.3	− 2531	−6.7	× 54 / 220	−1.6
Sum, rounded to a whole point						−24

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,962	2427.4	− 2432	−4.6	× 52 / 215	−1.1
4	41,965	2460.8	− 2473	−12.2	× 54 / 215	−3.1
5	41,966	2503.7	− 2502	1.7	× 57 / 215	0.5
6	41,969	2527.7	− 2531	−3.3	× 52 / 215	−0.8
Sum, rounded to a whole point						−5

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,984	2430.0	− 2432	−2	× 55 / 240	−0.5
4	41,985	2480.5	− 2473	7.5	× 64 / 240	2
5	41,988	2512.7	− 2502	10.7	× 61 / 240	2.7
6	41,989	2537.6	− 2531	6.6	× 60 / 240	1.7
Sum, rounded to a whole point						6

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	42,121	2432.0	− 2432	0	× 52 / 226	0
4	42,122	2486.3	− 2473	13.3	× 50 / 226	2.9
5	42,123	2522.3	− 2502	20.3	× 63 / 226	5.7
6	42,124	2539.1	− 2531	8.1	× 61 / 226	2.2
Sum, rounded to a whole point						11

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,890	2388.1	− 2432	−43.9	× 60 / 215	−12.3
4	41,891	2451.0	− 2473	−22	× 50 / 215	−5.1
5	41,892	2484.5	− 2502	−17.5	× 51 / 215	−4.2
6	41,893	2490.9	− 2531	−40.1	× 54 / 215	−10.1
Sum, rounded to a whole point						−32

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,915	2402.7	− 2432	−29.3	× 54 / 218	−7.3
4	41,916	2455.2	− 2473	−17.8	× 61 / 218	−5
5	41,917	2472.1	− 2502	−29.9	× 57 / 218	−7.8
6	41,918	2507.6	− 2531	−23.4	× 46 / 218	−4.9
Sum, rounded to a whole point						−25

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,746	2432.1	− 2432	0.1	× 37 / 220	0
4	41,747	2463.3	− 2473	−9.7	× 58 / 220	−2.6
5	41,748	2502.9	− 2502	0.9	× 66 / 220	0.3
6	41,749	2511.0	− 2531	−20	× 59 / 220	−5.4
Sum, rounded to a whole point						−8

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,505	2395.0	− 2432	−37	× 52 / 215	−8.9
4	41,506	2466.4	− 2473	−6.6	× 44 / 215	−1.4
5	41,507	2493.4	− 2502	−8.6	× 58 / 215	−2.3
6	41,508	2528.6	− 2531	−2.4	× 61 / 215	−0.7
Sum, rounded to a whole point						−13

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −18, −24, −5, 6, 11, −32, −25, −8, −13 → −12
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: 19 · 2017→2018: 11 · 2018→2019: 5 · 2019→2022: 43 · 2022→2023: 7 · 2023→2024: 17 · 2024→2025: 5 → average 14.1
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 14.1 × 2.66 = 37.5. Upper limit 25.5, lower limit −49.5.

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.