Gibson Elementary: 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	10,687	2421.4	− 2432	−10.6	× 78 / 271	−3.1
4	10,689	2452.6	− 2473	−20.4	× 77 / 271	−5.8
5	10,691	2476.4	− 2502	−25.6	× 59 / 271	−5.6
6	10,693	2510.2	− 2531	−20.8	× 57 / 271	−4.4
Sum, rounded to a whole point						−19

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	9,704	2435.8	− 2432	3.8	× 68 / 272	1
4	9,707	2450.5	− 2473	−22.5	× 88 / 272	−7.3
5	9,709	2484.0	− 2502	−18	× 57 / 272	−3.8
6	9,710	2514.2	− 2531	−16.8	× 59 / 272	−3.6
Sum, rounded to a whole point						−14

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,032	2428.3	− 2432	−3.7	× 65 / 233	−1
4	10,035	2481.5	− 2473	8.5	× 57 / 233	2.1
5	10,037	2468.4	− 2502	−33.6	× 60 / 233	−8.7
6	10,038	2520.1	− 2531	−10.9	× 51 / 233	−2.4
Sum, rounded to a whole point						−10

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,050	2439.3	− 2432	7.3	× 58 / 231	1.8
4	10,053	2457.2	− 2473	−15.8	× 61 / 231	−4.2
5	10,054	2477.8	− 2502	−24.2	× 48 / 231	−5
6	10,057	2515.0	− 2531	−16	× 64 / 231	−4.4
Sum, rounded to a whole point						−12

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,126	2436.5	− 2432	4.5	× 72 / 220	1.5
4	10,127	2462.7	− 2473	−10.3	× 53 / 220	−2.5
5	10,128	2482.6	− 2502	−19.4	× 45 / 220	−4
6	10,129	2523.8	− 2531	−7.2	× 50 / 220	−1.6
Sum, rounded to a whole point						−7

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,119	2449.3	− 2432	17.3	× 57 / 212	4.7
4	10,120	2452.4	− 2473	−20.6	× 61 / 212	−5.9
5	10,121	2498.3	− 2502	−3.7	× 47 / 212	−0.8
6	10,122	2484.1	− 2531	−46.9	× 47 / 212	−10.4
Sum, rounded to a whole point						−12

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,107	2445.2	− 2432	13.2	× 62 / 199	4.1
4	10,108	2492.6	− 2473	19.6	× 49 / 199	4.8
5	10,109	2473.4	− 2502	−28.6	× 41 / 199	−5.9
6	10,110	2504.3	− 2531	−26.7	× 47 / 199	−6.3
Sum, rounded to a whole point						−3

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,073	2404.6	− 2432	−27.4	× 45 / 183	−6.7
4	10,074	2453.7	− 2473	−19.3	× 57 / 183	−6
5	10,075	2504.4	− 2502	2.4	× 37 / 183	0.5
6	10,076	2522.3	− 2531	−8.7	× 44 / 183	−2.1
Sum, rounded to a whole point						−14

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	10,050	2438.5	− 2432	6.5	× 61 / 191	2.1
4	10,051	2435.7	− 2473	−37.3	× 46 / 191	−9
5	10,052	2521.5	− 2502	19.5	× 41 / 191	4.2
6	10,053	2541.9	− 2531	10.9	× 43 / 191	2.5
Sum, rounded to a whole point						0

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −19, −14, −10, −12, −7, −12, −3, −14, 0 → −10.1
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 5 · 2016→2017: 4 · 2017→2018: 2 · 2018→2019: 5 · 2019→2022: 5 · 2022→2023: 9 · 2023→2024: 11 · 2024→2025: 14 → average 6.9
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 6.9 × 2.66 = 18.4. Upper limit 8.3, lower limit −28.5.

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.