Charter Home School Academy: 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.

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
6	101,894	2478.2	− 2552	−73.8	× 11 / 45	−18
7	101,895	2439.4	− 2567	−127.6	× 14 / 45	−39.7
8	101,898	2449.6	− 2586	−136.4	× 20 / 45	−60.6
Sum, rounded to a whole point						−118

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
7	94,607	2520.1	− 2567	−46.9	× 17 / 35	−22.8
8	94,609	2499.0	− 2586	−87	× 18 / 35	−44.7
Sum, rounded to a whole point						−68

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
7	97,388	2474.2	− 2567	−92.8	× 17 / 45	−35.1
8	97,391	2475.3	− 2586	−110.7	× 28 / 45	−68.9
Sum, rounded to a whole point						−104

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	97,563	2428.5	− 2528	−99.5	× 14 / 63	−22.1
7	97,567	2484.2	− 2567	−82.8	× 21 / 63	−27.6
8	97,570	2443.6	− 2586	−142.4	× 28 / 63	−63.3
Sum, rounded to a whole point						−113

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	98,216	2384.2	− 2528	−143.8	× 13 / 89	−21
6	98,217	2437.4	− 2552	−114.6	× 15 / 89	−19.3
7	98,218	2467.6	− 2567	−99.4	× 26 / 89	−29
8	98,219	2480.2	− 2586	−105.8	× 35 / 89	−41.6
Sum, rounded to a whole point						−111

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	98,414	2402.3	− 2436	−33.7	× 16 / 67	−8
5	98,416	2430.8	− 2528	−97.2	× 12 / 67	−17.4
7	98,418	2452.9	− 2567	−114.1	× 19 / 67	−32.4
8	98,419	2447.3	− 2586	−138.7	× 20 / 67	−41.4
Sum, rounded to a whole point						−99

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	98,257	2377.3	− 2436	−58.7	× 17 / 136	−7.3
4	98,258	2434.3	− 2485	−50.7	× 12 / 136	−4.5
5	98,259	2466.1	− 2528	−61.9	× 12 / 136	−5.5
6	98,260	2446.2	− 2552	−105.8	× 22 / 136	−17.1
7	98,261	2461.4	− 2567	−105.6	× 30 / 136	−23.3
8	98,262	2463.5	− 2586	−122.5	× 43 / 136	−38.7
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	98,164	2374.9	− 2436	−61.1	× 14 / 116	−7.4
4	98,165	2426.9	− 2485	−58.1	× 15 / 116	−7.5
5	98,166	2445.8	− 2528	−82.2	× 18 / 116	−12.8
6	98,167	2526.3	− 2552	−25.7	× 14 / 116	−3.1
7	98,168	2451.2	− 2567	−115.8	× 25 / 116	−25
8	98,169	2483.9	− 2586	−102.1	× 30 / 116	−26.4
Sum, rounded to a whole point						−82

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	97,857	2389.8	− 2436	−46.2	× 16 / 205	−3.6
4	97,858	2421.0	− 2485	−64	× 26 / 205	−8.1
5	97,859	2440.9	− 2528	−87.1	× 28 / 205	−11.9
6	97,860	2425.2	− 2552	−126.8	× 25 / 205	−15.5
7	97,861	2429.2	− 2567	−137.8	× 50 / 205	−33.6
8	97,862	2445.2	− 2586	−140.8	× 60 / 205	−41.2
Sum, rounded to a whole point						−114

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −118, −68, −104, −113, −111, −99, −96, −82, −114 → −100.6
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 50 · 2016→2017: 36 · 2017→2018: 9 · 2018→2019: 2 · 2019→2022: 12 · 2022→2023: 3 · 2023→2024: 14 · 2024→2025: 32 → average 19.8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 19.8 × 2.66 = 52.7. Upper limit −47.9, lower limit −153.3.

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 2014–15, 2015–16, 2016–17, 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.