Rio 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 11.

3rd The average 3rd grader scores 12 points under the grade 3 bar. 2424 vs. 2436.
4th The average 4th grader scores 26 points under the grade 4 bar. 2459 vs. 2485.
5th The average 5th grader scores 28 points under the grade 5 bar. 2500 vs. 2528.
6th The average 6th grader scores 37 points under the grade 5 bar. 2491 vs. 2528. The 6th-grade bar is 2552.
7th The average 7th grader scores 20 points under the grade 5 bar. 2508 vs. 2528. The 7th-grade bar is 2567.
8th The average 8th grader scores 18 points under the grade 6 bar. 2534 vs. 2552. The 8th-grade bar is 2586.
11th The average 11th grader scores 14 points under the grade 7 bar. 2553 vs. 2567. The 11th-grade bar is 2628.

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
7	79,273	2484.7	− 2567	−82.3	× 19 / 93	−16.8
8	79,274	2420.7	− 2586	−165.3	× 23 / 93	−40.9
11	79,277	2470.7	− 2628	−157.3	× 51 / 93	−86.3
Sum, rounded to a whole point						−144

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	73,450	2412.8	− 2528	−115.2	× 13 / 99	−15.1
6	73,453	2408.2	− 2552	−143.8	× 11 / 99	−16
7	73,455	2487.8	− 2567	−79.2	× 13 / 99	−10.4
8	73,457	2455.2	− 2586	−130.8	× 24 / 99	−31.7
11	73,458	2510.7	− 2628	−117.3	× 38 / 99	−45
Sum, rounded to a whole point						−118

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	75,403	2368.2	− 2436	−67.8	× 18 / 138	−8.8
4	75,405	2411.0	− 2485	−74	× 15 / 138	−8
5	75,408	2448.0	− 2528	−80	× 13 / 138	−7.5
6	75,410	2439.4	− 2552	−112.6	× 17 / 138	−13.9
7	75,411	2450.1	− 2567	−116.9	× 18 / 138	−15.2
8	75,414	2479.3	− 2586	−106.7	× 18 / 138	−13.9
11	75,415	2486.4	− 2628	−141.6	× 39 / 138	−40
Sum, rounded to a whole point						−107

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	75,599	2402.4	− 2436	−33.6	× 25 / 335	−2.5
4	75,600	2406.5	− 2485	−78.5	× 34 / 335	−8
5	75,603	2434.1	− 2528	−93.9	× 31 / 335	−8.7
6	75,604	2449.1	− 2552	−102.9	× 39 / 335	−12
7	75,607	2470.5	− 2567	−96.5	× 52 / 335	−15
8	75,608	2494.8	− 2586	−91.2	× 38 / 335	−10.3
11	75,611	2466.7	− 2628	−161.3	× 116 / 335	−55.9
Sum, rounded to a whole point						−112

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	76,128	2395.7	− 2436	−40.3	× 44 / 428	−4.1
4	76,129	2445.2	− 2485	−39.8	× 38 / 428	−3.5
5	76,130	2445.2	− 2528	−82.8	× 45 / 428	−8.7
6	76,131	2457.6	− 2552	−94.4	× 42 / 428	−9.3
7	76,132	2487.6	− 2567	−79.4	× 68 / 428	−12.6
8	76,133	2479.1	− 2586	−106.9	× 74 / 428	−18.5
11	76,134	2478.6	− 2628	−149.4	× 117 / 428	−40.8
Sum, rounded to a whole point						−98

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	76,274	2358.1	− 2436	−77.9	× 47 / 418	−8.8
4	76,275	2410.3	− 2485	−74.7	× 53 / 418	−9.5
5	76,276	2446.5	− 2528	−81.5	× 51 / 418	−9.9
6	76,277	2477.8	− 2552	−74.2	× 47 / 418	−8.3
7	76,278	2507.4	− 2567	−59.6	× 63 / 418	−9
8	76,279	2497.9	− 2586	−88.1	× 74 / 418	−15.6
11	76,280	2483.1	− 2628	−144.9	× 83 / 418	−28.8
Sum, rounded to a whole point						−90

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	76,256	2371.7	− 2436	−64.3	× 51 / 415	−7.9
4	76,257	2384.4	− 2485	−100.6	× 38 / 415	−9.2
5	76,258	2442.1	− 2528	−85.9	× 52 / 415	−10.8
6	76,259	2486.9	− 2552	−65.1	× 50 / 415	−7.8
7	76,260	2506.3	− 2567	−60.7	× 60 / 415	−8.8
8	76,261	2510.3	− 2586	−75.7	× 72 / 415	−13.1
11	76,262	2497.4	− 2628	−130.6	× 92 / 415	−29
Sum, rounded to a whole point						−87

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	76,251	2396.9	− 2436	−39.1	× 35 / 379	−3.6
4	76,252	2436.9	− 2485	−48.1	× 41 / 379	−5.2
5	76,253	2439.5	− 2528	−88.5	× 40 / 379	−9.3
6	76,254	2499.7	− 2552	−52.3	× 47 / 379	−6.5
7	76,255	2511.4	− 2567	−55.6	× 65 / 379	−9.5
8	76,256	2518.5	− 2586	−67.5	× 76 / 379	−13.5
11	76,257	2518.0	− 2628	−110	× 75 / 379	−21.8
Sum, rounded to a whole point						−69

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	75,924	2419.9	− 2436	−16.1	× 43 / 359	−1.9
4	75,925	2454.4	− 2485	−30.6	× 33 / 359	−2.8
5	75,926	2480.5	− 2528	−47.5	× 41 / 359	−5.4
6	75,927	2495.4	− 2552	−56.6	× 41 / 359	−6.5
7	75,928	2532.0	− 2567	−35	× 66 / 359	−6.4
8	75,929	2521.4	− 2586	−64.6	× 72 / 359	−13
11	75,930	2522.8	− 2628	−105.2	× 63 / 359	−18.5
Sum, rounded to a whole point						−54

2026 from sb_ca2026_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	75,834	2423.9	− 2436	−12.1	× 40 / 403	−1.2
4	75,835	2459.4	− 2485	−25.6	× 56 / 403	−3.6
5	75,836	2500.0	− 2528	−28	× 40 / 403	−2.8
6	75,837	2490.9	− 2552	−61.1	× 55 / 403	−8.3
7	75,838	2507.8	− 2567	−59.2	× 75 / 403	−11
8	75,839	2533.9	− 2586	−52.1	× 73 / 403	−9.4
11	75,840	2552.6	− 2628	−75.4	× 64 / 403	−12
Sum, rounded to a whole point						−48

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −144, −118, −107, −112, −98, −90, −87, −69, −54, −48 → −92.7
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 26 · 2016→2017: 11 · 2017→2018: 5 · 2018→2019: 14 · 2019→2022: 8 · 2022→2023: 3 · 2023→2024: 18 · 2024→2025: 15 · 2025→2026: 6 → average 11.8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 11.8 × 2.66 = 31.4. Upper limit −61.3, lower limit −124.1.

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.