Bert Corona 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.

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	26,682	2455.0	− 2552	−97	× 123 / 370	−32.2
7	26,683	2506.5	− 2567	−60.5	× 123 / 370	−20.1
8	26,685	2483.6	− 2586	−102.4	× 124 / 370	−34.3
Sum, rounded to a whole point						−87

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	24,802	2447.9	− 2528	−80.1	× 23 / 370	−5
6	24,804	2460.3	− 2552	−91.7	× 114 / 370	−28.3
7	24,806	2473.1	− 2567	−93.9	× 117 / 370	−29.7
8	24,808	2508.1	− 2586	−77.9	× 116 / 370	−24.4
Sum, rounded to a whole point						−87

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	25,298	2422.5	− 2528	−105.5	× 28 / 366	−8.1
6	25,300	2467.4	− 2552	−84.6	× 115 / 366	−26.6
7	25,303	2472.8	− 2567	−94.2	× 108 / 366	−27.8
8	25,305	2498.4	− 2586	−87.6	× 115 / 366	−27.5
Sum, rounded to a whole point						−90

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	25,325	2412.0	− 2528	−116	× 25 / 368	−7.9
6	25,327	2452.4	− 2552	−99.6	× 118 / 368	−31.9
7	25,329	2479.5	− 2567	−87.5	× 120 / 368	−28.5
8	25,331	2471.7	− 2586	−114.3	× 105 / 368	−32.6
Sum, rounded to a whole point						−101

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	25,488	2422.6	− 2528	−105.4	× 25 / 376	−7
6	25,489	2444.4	− 2552	−107.6	× 118 / 376	−33.8
7	25,490	2450.4	− 2567	−116.6	× 117 / 376	−36.3
8	25,491	2478.9	− 2586	−107.1	× 116 / 376	−33
Sum, rounded to a whole point						−110

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	25,431	2410.6	− 2528	−117.4	× 17 / 337	−5.9
6	25,432	2425.3	− 2552	−126.7	× 103 / 337	−38.7
7	25,433	2465.8	− 2567	−101.2	× 106 / 337	−31.8
8	25,434	2449.8	− 2586	−136.2	× 111 / 337	−44.9
Sum, rounded to a whole point						−121

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	25,384	2405.4	− 2528	−122.6	× 14 / 326	−5.3
6	25,385	2403.2	− 2552	−148.8	× 107 / 326	−48.8
7	25,386	2440.4	− 2567	−126.6	× 105 / 326	−40.8
8	25,387	2446.7	− 2586	−139.3	× 100 / 326	−42.7
Sum, rounded to a whole point						−138

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	25,237	2431.2	− 2552	−120.8	× 119 / 337	−42.7
7	25,238	2425.1	− 2567	−141.9	× 108 / 337	−45.5
8	25,239	2442.8	− 2586	−143.2	× 110 / 337	−46.7
Sum, rounded to a whole point						−135

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	25,126	2424.6	− 2552	−127.4	× 109 / 329	−42.2
7	25,127	2458.6	− 2567	−108.4	× 117 / 329	−38.5
8	25,128	2428.8	− 2586	−157.2	× 103 / 329	−49.2
Sum, rounded to a whole point						−130

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −87, −87, −90, −101, −110, −121, −138, −135, −130 → −111
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 0 · 2016→2017: 3 · 2017→2018: 11 · 2018→2019: 9 · 2019→2022: 11 · 2022→2023: 17 · 2023→2024: 3 · 2024→2025: 5 → average 7.4
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 7.4 × 2.66 = 19.7. Upper limit −91.3, lower limit −130.7.

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.