Clarksville Charter: math

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.

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	8,218	2353.8	− 2436	−82.2	× 50 / 380	−10.8
4	8,221	2404.0	− 2485	−81	× 67 / 380	−14.3
5	8,222	2418.9	− 2528	−109.1	× 64 / 380	−18.4
6	8,225	2469.1	− 2552	−82.9	× 62 / 380	−13.5
7	8,226	2509.4	− 2567	−57.6	× 60 / 380	−9.1
8	8,229	2493.0	− 2586	−93	× 51 / 380	−12.5
11	8,230	2509.4	− 2628	−118.6	× 26 / 380	−8.1
Sum, rounded to a whole point						−87

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	8,276	2363.7	− 2436	−72.3	× 61 / 455	−9.7
4	8,277	2406.1	− 2485	−78.9	× 62 / 455	−10.8
5	8,278	2433.3	− 2528	−94.7	× 86 / 455	−17.9
6	8,279	2451.5	− 2552	−100.5	× 77 / 455	−17
7	8,280	2500.2	− 2567	−66.8	× 82 / 455	−12
8	8,281	2485.1	− 2586	−100.9	× 54 / 455	−12
11	8,282	2499.0	− 2628	−129	× 33 / 455	−9.4
Sum, rounded to a whole point						−89

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	8,187	2418.4	− 2436	−17.6	× 157 / 894	−3.1
4	8,188	2430.2	− 2485	−54.8	× 135 / 894	−8.3
5	8,189	2456.3	− 2528	−71.7	× 145 / 894	−11.6
6	8,190	2467.9	− 2552	−84.1	× 125 / 894	−11.8
7	8,191	2509.9	− 2567	−57.1	× 146 / 894	−9.3
8	8,192	2498.7	− 2586	−87.3	× 122 / 894	−11.9
11	8,193	2531.6	− 2628	−96.4	× 64 / 894	−6.9
Sum, rounded to a whole point						−63

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	8,171	2391.2	− 2436	−44.8	× 154 / 1067	−6.5
4	8,172	2448.9	− 2485	−36.1	× 181 / 1067	−6.1
5	8,173	2450.9	− 2528	−77.1	× 166 / 1067	−12
6	8,174	2476.9	− 2552	−75.1	× 167 / 1067	−11.8
7	8,175	2510.3	− 2567	−56.7	× 168 / 1067	−8.9
8	8,176	2513.3	− 2586	−72.7	× 148 / 1067	−10.1
11	8,177	2556.6	− 2628	−71.4	× 83 / 1067	−5.6
Sum, rounded to a whole point						−61

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	8,117	2391.2	− 2436	−44.8	× 169 / 1112	−6.8
4	8,118	2419.5	− 2485	−65.5	× 171 / 1112	−10.1
5	8,119	2461.5	− 2528	−66.5	× 178 / 1112	−10.6
6	8,120	2478.6	− 2552	−73.4	× 182 / 1112	−12
7	8,121	2510.3	− 2567	−56.7	× 167 / 1112	−8.5
8	8,122	2517.1	− 2586	−68.9	× 163 / 1112	−10.1
11	8,123	2564.8	− 2628	−63.2	× 82 / 1112	−4.7
Sum, rounded to a whole point						−63

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	8,072	2403.6	− 2436	−32.4	× 241 / 1249	−6.3
4	8,073	2438.5	− 2485	−46.5	× 181 / 1249	−6.7
5	8,074	2454.8	− 2528	−73.2	× 174 / 1249	−10.2
6	8,075	2494.7	− 2552	−57.3	× 190 / 1249	−8.7
7	8,076	2522.9	− 2567	−44.1	× 182 / 1249	−6.4
8	8,077	2536.2	− 2586	−49.8	× 168 / 1249	−6.7
11	8,078	2587.6	− 2628	−40.4	× 113 / 1249	−3.7
Sum, rounded to a whole point						−49

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −87, −89, −63, −61, −63, −49 → −68.7
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2018→2019: 2 · 2019→2022: 26 · 2022→2023: 2 · 2023→2024: 2 · 2024→2025: 14 → average 9.2
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 9.2 × 2.66 = 24.5. Upper limit −44.2, lower limit −93.2.

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 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.