Gabriella Charter: english

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
3	26,755	2443.0	− 2432	11	× 44 / 300	1.6
4	26,757	2490.8	− 2473	17.8	× 51 / 300	3
5	26,759	2540.7	− 2502	38.7	× 51 / 300	6.6
6	26,761	2539.9	− 2531	8.9	× 51 / 300	1.5
7	26,763	2543.6	− 2552	−8.4	× 52 / 300	−1.5
8	26,765	2568.5	− 2567	1.5	× 51 / 300	0.3
Sum, rounded to a whole point						12

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	24,877	2436.5	− 2432	4.5	× 44 / 298	0.7
4	24,880	2482.8	− 2473	9.8	× 52 / 298	1.7
5	24,881	2536.7	− 2502	34.7	× 52 / 298	6.1
6	24,884	2603.8	− 2531	72.8	× 52 / 298	12.7
7	24,885	2591.4	− 2552	39.4	× 51 / 298	6.7
8	24,887	2602.1	− 2567	35.1	× 47 / 298	5.5
Sum, rounded to a whole point						33

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	25,374	2445.0	− 2432	13	× 44 / 301	1.9
4	25,376	2488.0	− 2473	15	× 52 / 301	2.6
5	25,379	2530.2	− 2502	28.2	× 52 / 301	4.9
6	25,381	2561.5	− 2531	30.5	× 52 / 301	5.3
7	25,382	2613.5	− 2552	61.5	× 51 / 301	10.4
8	25,384	2597.4	− 2567	30.4	× 50 / 301	5
Sum, rounded to a whole point						30

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	25,401	2447.9	− 2432	15.9	× 44 / 301	2.3
4	25,403	2505.1	− 2473	32.1	× 53 / 301	5.7
5	25,405	2522.6	− 2502	20.6	× 52 / 301	3.6
6	25,407	2545.8	− 2531	14.8	× 49 / 301	2.4
7	25,409	2587.3	− 2552	35.3	× 52 / 301	6.1
8	25,411	2640.0	− 2567	73	× 51 / 301	12.4
Sum, rounded to a whole point						32

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	25,559	2421.4	− 2432	−10.6	× 49 / 311	−1.7
4	25,560	2502.4	− 2473	29.4	× 49 / 311	4.6
5	25,561	2535.3	− 2502	33.3	× 53 / 311	5.7
6	25,562	2527.2	− 2531	−3.8	× 53 / 311	−0.6
7	25,563	2565.5	− 2552	13.5	× 53 / 311	2.3
8	25,564	2625.6	− 2567	58.6	× 54 / 311	10.2
Sum, rounded to a whole point						20

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	25,502	2390.6	− 2432	−41.4	× 38 / 289	−5.4
4	25,503	2492.8	− 2473	19.8	× 45 / 289	3.1
5	25,504	2487.2	− 2502	−14.8	× 49 / 289	−2.5
6	25,505	2516.4	− 2531	−14.6	× 52 / 289	−2.6
7	25,506	2570.6	− 2552	18.6	× 51 / 289	3.3
8	25,507	2593.8	− 2567	26.8	× 54 / 289	5
Sum, rounded to a whole point						1

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	25,455	2400.3	− 2432	−31.7	× 36 / 280	−4.1
4	25,456	2485.3	− 2473	12.3	× 42 / 280	1.8
5	25,457	2505.3	− 2502	3.3	× 45 / 280	0.5
6	25,458	2498.9	− 2531	−32.1	× 53 / 280	−6.1
7	25,459	2555.0	− 2552	3	× 53 / 280	0.6
8	25,460	2549.0	− 2567	−18	× 51 / 280	−3.3
Sum, rounded to a whole point						−10

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	25,307	2384.9	− 2432	−47.1	× 44 / 282	−7.3
4	25,308	2425.0	− 2473	−48	× 34 / 282	−5.8
5	25,309	2458.6	− 2502	−43.4	× 44 / 282	−6.8
6	25,310	2522.0	− 2531	−9	× 51 / 282	−1.6
7	25,311	2509.4	− 2552	−42.6	× 55 / 282	−8.3
8	25,312	2589.1	− 2567	22.1	× 54 / 282	4.2
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
3	25,196	2342.5	− 2432	−89.5	× 53 / 290	−16.4
4	25,197	2403.1	− 2473	−69.9	× 44 / 290	−10.6
5	25,198	2483.8	− 2502	−18.2	× 32 / 290	−2
6	25,199	2483.2	− 2531	−47.8	× 52 / 290	−8.6
7	25,200	2528.4	− 2552	−23.6	× 54 / 290	−4.4
8	25,201	2548.1	− 2567	−18.9	× 55 / 290	−3.6
Sum, rounded to a whole point						−46

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. 12, 33, 30, 32, 20, 1, −10, −26, −46 → 5.1
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 21 · 2016→2017: 3 · 2017→2018: 2 · 2018→2019: 12 · 2019→2022: 19 · 2022→2023: 11 · 2023→2024: 16 · 2024→2025: 20 → average 13
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 13 × 2.66 = 34.6. Upper limit 39.7, lower limit −29.5.

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.