Anderson Valley Unified: math

The shaded band is this district'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	43,105	2420.8	− 2436	−15.2	× 42 / 263	−2.4
4	43,108	2436.9	− 2485	−48.1	× 43 / 263	−7.9
5	43,110	2470.4	− 2528	−57.6	× 34 / 263	−7.4
6	43,111	2552.7	− 2552	0.7	× 30 / 263	0.1
7	43,114	2528.9	− 2567	−38.1	× 26 / 263	−3.8
8	43,116	2517.9	− 2586	−68.1	× 49 / 263	−12.7
11	43,118	2637.5	− 2628	9.5	× 39 / 263	1.4
Sum, rounded to a whole point						−33

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	39,797	2410.9	− 2436	−25.1	× 37 / 264	−3.5
4	39,800	2438.7	− 2485	−46.3	× 39 / 264	−6.8
5	39,801	2460.4	− 2528	−67.6	× 50 / 264	−12.8
6	39,804	2497.7	− 2552	−54.3	× 31 / 264	−6.4
7	39,806	2526.0	− 2567	−41	× 32 / 264	−5
8	39,808	2520.4	− 2586	−65.6	× 29 / 264	−7.2
11	39,810	2572.7	− 2628	−55.3	× 46 / 264	−9.6
Sum, rounded to a whole point						−51

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	40,816	2397.8	− 2436	−38.2	× 36 / 253	−5.4
4	40,818	2428.8	− 2485	−56.2	× 37 / 253	−8.2
5	40,821	2519.3	− 2528	−8.7	× 37 / 253	−1.3
6	40,823	2480.8	− 2552	−71.2	× 47 / 253	−13.2
7	40,825	2516.1	− 2567	−50.9	× 29 / 253	−5.8
8	40,826	2544.7	− 2586	−41.3	× 32 / 253	−5.2
11	40,828	2538.9	− 2628	−89.1	× 35 / 253	−12.3
Sum, rounded to a whole point						−52

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	40,838	2423.8	− 2436	−12.2	× 31 / 268	−1.4
4	40,839	2456.7	− 2485	−28.3	× 38 / 268	−4
5	40,842	2476.6	− 2528	−51.4	× 39 / 268	−7.5
6	40,843	2539.3	− 2552	−12.7	× 41 / 268	−1.9
7	40,846	2516.0	− 2567	−51	× 48 / 268	−9.1
8	40,847	2525.3	− 2586	−60.7	× 30 / 268	−6.8
11	40,850	2507.0	− 2628	−121	× 41 / 268	−18.5
Sum, rounded to a whole point						−49

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	40,991	2386.4	− 2436	−49.6	× 40 / 252	−7.9
4	40,992	2466.6	− 2485	−18.4	× 29 / 252	−2.1
5	40,993	2479.5	− 2528	−48.5	× 40 / 252	−7.7
6	40,994	2486.5	− 2552	−65.5	× 38 / 252	−9.9
7	40,995	2533.8	− 2567	−33.2	× 40 / 252	−5.3
8	40,996	2534.5	− 2586	−51.5	× 47 / 252	−9.6
11	40,997	2526.3	− 2628	−101.7	× 18 / 252	−7.3
Sum, rounded to a whole point						−50

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	40,756	2361.5	− 2436	−74.5	× 27 / 248	−8.1
4	40,757	2362.6	− 2485	−122.4	× 33 / 248	−16.3
5	40,758	2425.1	− 2528	−102.9	× 36 / 248	−14.9
6	40,759	2442.8	− 2552	−109.2	× 38 / 248	−16.7
7	40,760	2495.6	− 2567	−71.4	× 29 / 248	−8.3
8	40,761	2493.0	− 2586	−93	× 43 / 248	−16.1
11	40,762	2532.4	− 2628	−95.6	× 42 / 248	−16.2
Sum, rounded to a whole point						−97

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	40,791	2344.4	− 2436	−91.6	× 20 / 200	−9.2
4	40,792	2396.7	− 2485	−88.3	× 23 / 200	−10.2
5	40,793	2397.6	− 2528	−130.4	× 29 / 200	−18.9
6	40,794	2476.4	− 2552	−75.6	× 29 / 200	−11
7	40,795	2461.1	− 2567	−105.9	× 36 / 200	−19.1
8	40,796	2515.7	− 2586	−70.3	× 26 / 200	−9.1
11	40,797	2527.2	− 2628	−100.8	× 37 / 200	−18.6
Sum, rounded to a whole point						−96

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	40,610	2388.7	− 2436	−47.3	× 29 / 193	−7.1
4	40,611	2357.7	− 2485	−127.3	× 18 / 193	−11.9
5	40,612	2396.0	− 2528	−132	× 22 / 193	−15
6	40,613	2410.1	− 2552	−141.9	× 29 / 193	−21.3
7	40,614	2491.3	− 2567	−75.7	× 29 / 193	−11.4
8	40,615	2446.3	− 2586	−139.7	× 37 / 193	−26.8
11	40,616	2481.8	− 2628	−146.2	× 29 / 193	−22
Sum, rounded to a whole point						−115

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	40,399	2401.6	− 2436	−34.4	× 19 / 181	−3.6
4	40,400	2392.6	− 2485	−92.4	× 29 / 181	−14.8
5	40,401	2413.2	− 2528	−114.8	× 19 / 181	−12.1
6	40,402	2428.8	− 2552	−123.2	× 24 / 181	−16.3
7	40,403	2424.1	− 2567	−142.9	× 27 / 181	−21.3
8	40,404	2493.0	− 2586	−93	× 28 / 181	−14.4
11	40,405	2558.5	− 2628	−69.5	× 35 / 181	−13.4
Sum, rounded to a whole point						−96

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −33, −51, −52, −49, −50, −97, −96, −115, −96 → −71
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 18 · 2016→2017: 1 · 2017→2018: 3 · 2018→2019: 1 · 2019→2022: 47 · 2022→2023: 1 · 2023→2024: 19 · 2024→2025: 19 → average 13.6
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 13.6 × 2.66 = 36.2. Upper limit −34.8, lower limit −107.2.

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 — for a district, the total across its schools. From 2014–15, 2015–16, 2016–17, 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.