Grass Valley 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.

Measured against the grade bars

The state's math test uses one scale for every grade, so a score means the same thing in grade 3 as in grade 8.

3rd The average 3rd grader scores 15 points under the grade 3 bar. 2421 vs. 2436.
4th The average 4th grader meets the grade 4 bar. 2515 vs. 2485.
5th The average 5th grader scores just under the grade 4 bar. 2476 vs. 2485. The 5th-grade bar is 2528.
6th The average 6th grader scores 12 points under the grade 5 bar. 2516 vs. 2528. The 6th-grade bar is 2552.
7th The average 7th grader meets the grade 7 bar. 2572 vs. 2567.
8th The average 8th grader scores just under the grade 7 bar. 2561 vs. 2567. The 8th-grade bar is 2586.

2026 results. "Meets standard" is the state's mark for being on track for that grade.

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	47,417	2440.1	− 2436	4.1	× 54 / 317	0.7
4	47,418	2464.6	− 2485	−20.4	× 52 / 317	−3.3
5	47,421	2522.1	− 2528	−5.9	× 59 / 317	−1.1
6	47,422	2519.3	− 2552	−32.7	× 50 / 317	−5.2
7	47,425	2553.3	− 2567	−13.7	× 49 / 317	−2.1
8	47,426	2560.8	− 2586	−25.2	× 53 / 317	−4.2
Sum, rounded to a whole point						−15

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	44,090	2439.2	− 2436	3.2	× 54 / 303	0.6
4	44,092	2478.6	− 2485	−6.4	× 56 / 303	−1.2
5	44,094	2489.9	− 2528	−38.1	× 50 / 303	−6.3
6	44,095	2544.7	− 2552	−7.3	× 52 / 303	−1.3
7	44,098	2539.3	− 2567	−27.7	× 49 / 303	−4.5
8	44,099	2552.9	− 2586	−33.1	× 42 / 303	−4.6
Sum, rounded to a whole point						−17

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	45,159	2460.9	− 2436	24.9	× 58 / 320	4.5
4	45,161	2476.1	− 2485	−8.9	× 53 / 320	−1.5
5	45,163	2499.8	− 2528	−28.2	× 59 / 320	−5.2
6	45,164	2510.5	− 2552	−41.5	× 49 / 320	−6.4
7	45,166	2548.5	− 2567	−18.5	× 56 / 320	−3.2
8	45,169	2514.6	− 2586	−71.4	× 45 / 320	−10
Sum, rounded to a whole point						−22

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	45,178	2443.7	− 2436	7.7	× 57 / 321	1.4
4	45,179	2521.6	− 2485	36.6	× 55 / 321	6.3
5	45,182	2497.9	− 2528	−30.1	× 51 / 321	−4.8
6	45,183	2523.7	− 2552	−28.3	× 60 / 321	−5.3
7	45,186	2535.5	− 2567	−31.5	× 48 / 321	−4.7
8	45,187	2575.8	− 2586	−10.2	× 50 / 321	−1.6
Sum, rounded to a whole point						−9

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	45,310	2442.5	− 2436	6.5	× 58 / 340	1.1
4	45,311	2477.2	− 2485	−7.8	× 59 / 340	−1.4
5	45,312	2529.2	− 2528	1.2	× 54 / 340	0.2
6	45,313	2500.2	− 2552	−51.8	× 61 / 340	−9.3
7	45,314	2540.2	− 2567	−26.8	× 56 / 340	−4.4
8	45,315	2532.8	− 2586	−53.2	× 52 / 340	−8.1
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	45,031	2438.2	− 2436	2.2	× 53 / 324	0.4
4	45,032	2490.1	− 2485	5.1	× 52 / 324	0.8
5	45,033	2501.5	− 2528	−26.5	× 57 / 324	−4.7
6	45,034	2517.3	− 2552	−34.7	× 52 / 324	−5.6
7	45,035	2534.4	− 2567	−32.6	× 55 / 324	−5.5
8	45,036	2545.2	− 2586	−40.8	× 55 / 324	−6.9
Sum, rounded to a whole point						−22

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	45,005	2437.5	− 2436	1.5	× 60 / 320	0.3
4	45,006	2478.1	− 2485	−6.9	× 48 / 320	−1
5	45,007	2505.9	− 2528	−22.1	× 48 / 320	−3.3
6	45,008	2526.5	− 2552	−25.5	× 58 / 320	−4.6
7	45,009	2541.3	− 2567	−25.7	× 50 / 320	−4
8	45,010	2550.4	− 2586	−35.6	× 56 / 320	−6.2
Sum, rounded to a whole point						−19

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	44,850	2433.4	− 2436	−2.6	× 49 / 318	−0.4
4	44,851	2464.5	− 2485	−20.5	× 63 / 318	−4.1
5	44,852	2504.5	− 2528	−23.5	× 51 / 318	−3.8
6	44,853	2545.9	− 2552	−6.1	× 52 / 318	−1
7	44,854	2571.3	− 2567	4.3	× 55 / 318	0.7
8	44,855	2547.2	− 2586	−38.8	× 48 / 318	−5.9
Sum, rounded to a whole point						−14

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	44,594	2466.8	− 2436	30.8	× 56 / 329	5.2
4	44,595	2449.5	− 2485	−35.5	× 55 / 329	−5.9
5	44,596	2484.8	− 2528	−43.2	× 62 / 329	−8.1
6	44,597	2538.0	− 2552	−14	× 51 / 329	−2.2
7	44,598	2557.7	− 2567	−9.3	× 53 / 329	−1.5
8	44,599	2560.3	− 2586	−25.7	× 52 / 329	−4.1
Sum, rounded to a whole point						−17

2026 from sb_ca2026_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	44,453	2421.1	− 2436	−14.9	× 57 / 331	−2.6
4	44,454	2515.4	− 2485	30.4	× 57 / 331	5.2
5	44,455	2475.8	− 2528	−52.2	× 55 / 331	−8.7
6	44,456	2515.8	− 2552	−36.2	× 60 / 331	−6.6
7	44,457	2572.4	− 2567	5.4	× 52 / 331	0.8
8	44,458	2561.1	− 2586	−24.9	× 50 / 331	−3.8
Sum, rounded to a whole point						−15

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −15, −17, −22, −9, −22, −22, −19, −14, −17, −15 → −17.2
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 2 · 2016→2017: 5 · 2017→2018: 13 · 2018→2019: 13 · 2019→2022: 0 · 2022→2023: 3 · 2023→2024: 5 · 2024→2025: 3 · 2025→2026: 2 → average 5.1
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 5.1 × 2.66 = 13.6. Upper limit −3.6, lower limit −30.8.

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.