River Charter Schools Lighthouse 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 73 points under the grade 3 bar. 2363 vs. 2436.
4th The average 4th grader scores just under the grade 3 bar. 2431 vs. 2436. The 4th-grade bar is 2485.
5th The average 5th grader scores 36 points under the grade 4 bar. 2449 vs. 2485. The 5th-grade bar is 2528.
6th The average 6th grader scores 22 points under the grade 4 bar. 2464 vs. 2485. The 6th-grade bar is 2552.
7th The average 7th grader scores 32 points under the grade 5 bar. 2496 vs. 2528. The 7th-grade bar is 2567.
8th The average 8th grader scores 27 points under the grade 4 bar. 2458 vs. 2485. 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.

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	100,818	2388.3	− 2436	−47.7	× 19 / 19	−47.7
Sum, rounded to a whole point						−48

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	100,966	2438.7	− 2436	2.7	× 26 / 39	1.8
4	100,967	2466.5	− 2485	−18.5	× 13 / 39	−6.2
Sum, rounded to a whole point						−4

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,613	2453.6	− 2436	17.6	× 45 / 131	6
4	101,614	2440.7	− 2485	−44.3	× 31 / 131	−10.5
5	101,615	2436.4	− 2528	−91.6	× 32 / 131	−22.4
6	101,616	2508.3	− 2552	−43.7	× 23 / 131	−7.7
Sum, rounded to a whole point						−34

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,868	2438.4	− 2436	2.4	× 65 / 288	0.5
4	101,869	2466.5	− 2485	−18.5	× 61 / 288	−3.9
5	101,870	2454.4	− 2528	−73.6	× 54 / 288	−13.8
6	101,871	2480.9	− 2552	−71.1	× 58 / 288	−14.3
7	101,872	2498.4	− 2567	−68.6	× 20 / 288	−4.8
8	101,873	2463.4	− 2586	−122.6	× 30 / 288	−12.8
Sum, rounded to a whole point						−49

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,694	2391.9	− 2436	−44.1	× 54 / 252	−9.5
4	101,695	2489.0	− 2485	4	× 54 / 252	0.9
5	101,696	2453.8	− 2528	−74.2	× 50 / 252	−14.7
6	101,697	2496.6	− 2552	−55.4	× 36 / 252	−7.9
7	101,698	2479.3	− 2567	−87.7	× 38 / 252	−13.2
8	101,699	2500.1	− 2586	−85.9	× 20 / 252	−6.8
Sum, rounded to a whole point						−51

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,583	2365.6	− 2436	−70.4	× 56 / 263	−15
4	101,584	2436.9	− 2485	−48.1	× 48 / 263	−8.8
5	101,585	2506.0	− 2528	−22	× 53 / 263	−4.4
6	101,586	2517.4	− 2552	−34.6	× 36 / 263	−4.7
7	101,587	2475.1	− 2567	−91.9	× 35 / 263	−12.2
8	101,588	2502.2	− 2586	−83.8	× 35 / 263	−11.2
Sum, rounded to a whole point						−56

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,245	2369.9	− 2436	−66.1	× 48 / 269	−11.8
4	101,246	2422.6	− 2485	−62.4	× 48 / 269	−11.1
5	101,247	2484.2	− 2528	−43.8	× 44 / 269	−7.2
6	101,248	2492.3	− 2552	−59.7	× 53 / 269	−11.8
7	101,249	2474.2	− 2567	−92.8	× 37 / 269	−12.8
8	101,250	2492.3	− 2586	−93.7	× 39 / 269	−13.6
Sum, rounded to a whole point						−68

2026 from sb_ca2026_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	100,906	2363.2	− 2436	−72.8	× 44 / 262	−12.2
4	100,907	2430.9	− 2485	−54.1	× 47 / 262	−9.7
5	100,908	2448.6	− 2528	−79.4	× 44 / 262	−13.3
6	100,909	2463.5	− 2552	−88.5	× 46 / 262	−15.5
7	100,910	2495.8	− 2567	−71.2	× 48 / 262	−13
8	100,911	2457.7	− 2586	−128.3	× 33 / 262	−16.2
Sum, rounded to a whole point						−80

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −48, −4, −34, −49, −51, −56, −68, −80 → −48.8
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2017→2018: 44 · 2018→2019: 30 · 2019→2022: 15 · 2022→2023: 2 · 2023→2024: 5 · 2024→2025: 12 · 2025→2026: 12 → average 17.1
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 17.1 × 2.66 = 45.5. Upper limit −3.3, lower limit −94.3.

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 2015–16, 2016–17, 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.