Riverdale Joint 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	12,797	2424.3	− 2436	−11.7	× 122 / 784	−1.8
4	12,798	2426.3	− 2485	−58.7	× 126 / 784	−9.4
5	12,801	2452.4	− 2528	−75.6	× 106 / 784	−10.2
6	12,802	2455.3	− 2552	−96.7	× 90 / 784	−11.1
7	12,805	2490.4	− 2567	−76.6	× 104 / 784	−10.2
8	12,806	2538.8	− 2586	−47.2	× 111 / 784	−6.7
11	12,809	2558.1	− 2628	−69.9	× 125 / 784	−11.1
Sum, rounded to a whole point						−61

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	11,817	2446.9	− 2436	10.9	× 109 / 810	1.5
4	11,819	2436.5	− 2485	−48.5	× 128 / 810	−7.7
5	11,821	2459.3	− 2528	−68.7	× 132 / 810	−11.2
6	11,823	2458.5	− 2552	−93.5	× 110 / 810	−12.7
7	11,824	2478.8	− 2567	−88.2	× 90 / 810	−9.8
8	11,826	2548.4	− 2586	−37.6	× 106 / 810	−4.9
11	11,828	2562.1	− 2628	−65.9	× 135 / 810	−11
Sum, rounded to a whole point						−56

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	12,144	2436.2	− 2436	0.2	× 104 / 841	0
4	12,145	2445.1	− 2485	−39.9	× 105 / 841	−5
5	12,148	2464.3	− 2528	−63.7	× 129 / 841	−9.8
6	12,150	2471.6	− 2552	−80.4	× 134 / 841	−12.8
7	12,151	2479.2	− 2567	−87.8	× 116 / 841	−12.1
8	12,154	2517.5	− 2586	−68.5	× 95 / 841	−7.7
11	12,156	2538.7	− 2628	−89.3	× 158 / 841	−16.8
Sum, rounded to a whole point						−64

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	12,174	2444.6	− 2436	8.6	× 113 / 828	1.2
4	12,177	2449.2	− 2485	−35.8	× 104 / 828	−4.5
5	12,178	2485.5	− 2528	−42.5	× 106 / 828	−5.4
6	12,181	2468.1	− 2552	−83.9	× 129 / 828	−13.1
7	12,182	2485.1	− 2567	−81.9	× 132 / 828	−13.1
8	12,185	2538.1	− 2586	−47.9	× 115 / 828	−6.7
11	12,186	2540.2	− 2628	−87.8	× 129 / 828	−13.7
Sum, rounded to a whole point						−55

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	12,276	2441.9	− 2436	5.9	× 94 / 817	0.7
4	12,277	2460.8	− 2485	−24.2	× 113 / 817	−3.3
5	12,278	2460.7	− 2528	−67.3	× 110 / 817	−9.1
6	12,279	2494.2	− 2552	−57.8	× 105 / 817	−7.4
7	12,280	2507.5	− 2567	−59.5	× 126 / 817	−9.2
8	12,281	2519.3	− 2586	−66.7	× 132 / 817	−10.8
11	12,282	2551.8	− 2628	−76.2	× 137 / 817	−12.8
Sum, rounded to a whole point						−52

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	12,096	2367.1	− 2436	−68.9	× 85 / 697	−8.4
4	12,097	2420.0	− 2485	−65	× 109 / 697	−10.2
5	12,098	2421.9	− 2528	−106.1	× 91 / 697	−13.9
6	12,099	2459.6	− 2552	−92.4	× 89 / 697	−11.8
7	12,100	2483.1	− 2567	−83.9	× 96 / 697	−11.6
8	12,101	2496.5	− 2586	−89.5	× 97 / 697	−12.5
11	12,102	2549.3	− 2628	−78.7	× 130 / 697	−14.7
Sum, rounded to a whole point						−83

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	12,283	2401.8	− 2436	−34.2	× 105 / 762	−4.7
4	12,284	2424.6	− 2485	−60.4	× 100 / 762	−7.9
5	12,285	2437.4	− 2528	−90.6	× 118 / 762	−14
6	12,286	2464.2	− 2552	−87.8	× 90 / 762	−10.4
7	12,287	2513.4	− 2567	−53.6	× 103 / 762	−7.2
8	12,288	2531.2	− 2586	−54.8	× 104 / 762	−7.5
11	12,289	2546.1	− 2628	−81.9	× 142 / 762	−15.3
Sum, rounded to a whole point						−67

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	12,262	2405.3	− 2436	−30.7	× 90 / 744	−3.7
4	12,263	2442.7	− 2485	−42.3	× 105 / 744	−6
5	12,264	2440.5	− 2528	−87.5	× 102 / 744	−12
6	12,265	2478.4	− 2552	−73.6	× 119 / 744	−11.8
7	12,266	2515.6	− 2567	−51.4	× 86 / 744	−5.9
8	12,267	2562.7	− 2586	−23.3	× 103 / 744	−3.2
11	12,268	2530.6	− 2628	−97.4	× 139 / 744	−18.2
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	12,225	2391.8	− 2436	−44.2	× 79 / 717	−4.9
4	12,226	2415.9	− 2485	−69.1	× 92 / 717	−8.9
5	12,227	2476.0	− 2528	−52	× 103 / 717	−7.5
6	12,228	2476.4	− 2552	−75.6	× 103 / 717	−10.9
7	12,229	2500.2	− 2567	−66.8	× 118 / 717	−11
8	12,230	2527.7	− 2586	−58.3	× 89 / 717	−7.2
11	12,231	2509.6	− 2628	−118.4	× 133 / 717	−22
Sum, rounded to a whole point						−72

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	12,180	2382.8	− 2436	−53.2	× 84 / 722	−6.2
4	12,181	2416.3	− 2485	−68.7	× 84 / 722	−8
5	12,182	2454.7	− 2528	−73.3	× 92 / 722	−9.3
6	12,183	2474.3	− 2552	−77.7	× 105 / 722	−11.3
7	12,184	2507.9	− 2567	−59.1	× 100 / 722	−8.2
8	12,185	2516.8	− 2586	−69.2	× 121 / 722	−11.6
11	12,186	2532.4	− 2628	−95.6	× 136 / 722	−18
Sum, rounded to a whole point						−73

2026 from sb_ca2026_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	12,206	2387.7	− 2436	−48.3	× 97 / 672	−7
4	12,207	2436.9	− 2485	−48.1	× 75 / 672	−5.4
5	12,208	2466.5	− 2528	−61.5	× 85 / 672	−7.8
6	12,209	2450.2	− 2552	−101.8	× 93 / 672	−14.1
7	12,210	2518.7	− 2567	−48.3	× 99 / 672	−7.1
8	12,211	2522.6	− 2586	−63.4	× 97 / 672	−9.2
11	12,212	2537.7	− 2628	−90.3	× 126 / 672	−16.9
Sum, rounded to a whole point						−67

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −61, −56, −64, −55, −52, −83, −67, −61, −72, −73, −67 → −64.6
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 5 · 2016→2017: 8 · 2017→2018: 9 · 2018→2019: 3 · 2019→2021: 31 · 2021→2022: 16 · 2022→2023: 6 · 2023→2024: 11 · 2024→2025: 1 · 2025→2026: 6 → average 9.6
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 9.6 × 2.66 = 25.5. Upper limit −39.1, lower limit −90.1.

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 — 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.

Schools in Riverdale Joint Unified