Three Rivers 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 31 points under the grade 3 bar. 2405 vs. 2436.
5th The average 5th grader scores 45 points under the grade 4 bar. 2440 vs. 2485. The 5th-grade bar is 2528.
7th The average 7th grader meets the grade 7 bar. 2569 vs. 2567.
8th The average 8th grader scores 27 points under the grade 5 bar. 2501 vs. 2528. 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
4	43,206	2406.5	− 2485	−78.5	× 13 / 66	−15.5
5	43,207	2473.2	− 2528	−54.8	× 13 / 66	−10.8
6	43,210	2442.4	− 2552	−109.6	× 14 / 66	−23.2
7	43,211	2587.8	− 2567	20.8	× 14 / 66	4.4
8	43,214	2479.6	− 2586	−106.4	× 12 / 66	−19.3
Sum, rounded to a whole point						−64

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	39,895	2400.1	− 2436	−35.9	× 12 / 55	−7.8
5	39,900	2455.0	− 2528	−73	× 14 / 55	−18.6
7	39,903	2475.0	− 2567	−92	× 13 / 55	−21.7
8	39,905	2592.9	− 2586	6.9	× 16 / 55	2
Sum, rounded to a whole point						−46

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	40,922	2443.6	− 2528	−84.4	× 12 / 56	−18.1
6	40,925	2486.9	− 2552	−65.1	× 16 / 56	−18.6
7	40,926	2528.7	− 2567	−38.3	× 12 / 56	−8.2
8	40,929	2446.0	− 2586	−140	× 16 / 56	−40
Sum, rounded to a whole point						−85

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	40,939	2495.4	− 2528	−32.6	× 12 / 54	−7.2
6	40,942	2529.0	− 2552	−23	× 13 / 54	−5.5
7	40,943	2545.6	− 2567	−21.4	× 18 / 54	−7.1
8	40,945	2508.2	− 2586	−77.8	× 11 / 54	−15.8
Sum, rounded to a whole point						−36

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,089	2415.7	− 2436	−20.3	× 15 / 82	−3.7
4	41,090	2450.1	− 2485	−34.9	× 11 / 82	−4.7
5	41,091	2486.1	− 2528	−41.9	× 11 / 82	−5.6
6	41,092	2553.6	− 2552	1.6	× 15 / 82	0.3
7	41,093	2536.9	− 2567	−30.1	× 13 / 82	−4.8
8	41,094	2599.0	− 2586	13	× 17 / 82	2.7
Sum, rounded to a whole point						−16

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	40,025	2384.3	− 2436	−51.7	× 11 / 23	−24.7
4	40,026	2488.0	− 2485	3	× 12 / 23	1.6
Sum, rounded to a whole point						−23

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
4	40,854	2437.8	− 2485	−47.2	× 13 / 40	−15.3
5	40,855	2452.3	− 2528	−75.7	× 15 / 40	−28.4
7	40,857	2557.0	− 2567	−10	× 12 / 40	−3
Sum, rounded to a whole point						−47

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	40,884	2434.7	− 2436	−1.3	× 11 / 47	−0.3
5	40,886	2440.8	− 2528	−87.2	× 13 / 47	−24.1
6	40,887	2483.9	− 2552	−68.1	× 12 / 47	−17.4
8	40,889	2557.0	− 2586	−29	× 11 / 47	−6.8
Sum, rounded to a whole point						−49

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	40,710	2519.0	− 2552	−33	× 12 / 23	−17.2
7	40,711	2548.7	− 2567	−18.3	× 11 / 23	−8.8
Sum, rounded to a whole point						−26

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	40,495	2533.5	− 2552	−18.5	× 11 / 37	−5.5
7	40,496	2541.5	− 2567	−25.5	× 14 / 37	−9.6
8	40,497	2541.2	− 2586	−44.8	× 12 / 37	−14.5
Sum, rounded to a whole point						−30

2026 from sb_ca2026_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	40,400	2404.8	− 2436	−31.2	× 12 / 48	−7.8
5	40,402	2440.1	− 2528	−87.9	× 11 / 48	−20.1
7	40,404	2568.8	− 2567	1.8	× 12 / 48	0.5
8	40,405	2501.4	− 2586	−84.6	× 13 / 48	−22.9
Sum, rounded to a whole point						−50

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −64, −46, −85, −36, −16, −23, −47, −49, −26, −30, −50 → −42.9
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: 39 · 2017→2018: 49 · 2018→2019: 20 · 2019→2021: 7 · 2021→2022: 24 · 2022→2023: 2 · 2023→2024: 23 · 2024→2025: 4 · 2025→2026: 20 → average 20.6
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 20.6 × 2.66 = 54.8. Upper limit 11.9, lower limit −97.7.

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.