Sanchez (George I.) Elementary: 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
3	23,684	2465.8	− 2436	29.8	× 68 / 280	7.2
4	23,686	2454.7	− 2485	−30.3	× 63 / 280	−6.8
5	23,688	2490.4	− 2528	−37.6	× 73 / 280	−9.8
6	23,690	2540.6	− 2552	−11.4	× 76 / 280	−3.1
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	22,192	2476.7	− 2436	40.7	× 53 / 271	8
4	22,193	2486.6	− 2485	1.6	× 71 / 271	0.4
5	22,196	2489.1	− 2528	−38.9	× 71 / 271	−10.2
6	22,197	2518.3	− 2552	−33.7	× 76 / 271	−9.5
Sum, rounded to a whole point						−11

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	22,611	2454.5	− 2436	18.5	× 71 / 267	4.9
4	22,613	2507.6	− 2485	22.6	× 55 / 267	4.7
5	22,614	2486.3	− 2528	−41.7	× 75 / 267	−11.7
6	22,617	2510.3	− 2552	−41.7	× 66 / 267	−10.3
Sum, rounded to a whole point						−12

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	22,607	2456.2	− 2436	20.2	× 54 / 258	4.2
4	22,609	2491.0	− 2485	6	× 70 / 258	1.6
5	22,611	2495.8	− 2528	−32.2	× 58 / 258	−7.2
6	22,613	2516.1	− 2552	−35.9	× 76 / 258	−10.6
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	22,790	2447.7	− 2436	11.7	× 47 / 245	2.2
4	22,791	2508.8	− 2485	23.8	× 58 / 245	5.6
5	22,792	2499.5	− 2528	−28.5	× 79 / 245	−9.2
6	22,793	2528.1	− 2552	−23.9	× 61 / 245	−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	22,757	2405.0	− 2436	−31	× 44 / 205	−6.7
4	22,758	2502.9	− 2485	17.9	× 48 / 205	4.2
5	22,759	2494.7	− 2528	−33.3	× 65 / 205	−10.6
6	22,760	2514.3	− 2552	−37.7	× 48 / 205	−8.8
Sum, rounded to a whole point						−22

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	22,732	2427.8	− 2436	−8.2	× 47 / 196	−2
4	22,733	2462.8	− 2485	−22.2	× 42 / 196	−4.8
5	22,734	2530.1	− 2528	2.1	× 49 / 196	0.5
6	22,735	2546.3	− 2552	−5.7	× 58 / 196	−1.7
Sum, rounded to a whole point						−8

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	22,592	2453.7	− 2436	17.7	× 38 / 180	3.7
4	22,593	2484.1	− 2485	−0.9	× 47 / 180	−0.2
5	22,594	2492.3	− 2528	−35.7	× 44 / 180	−8.7
6	22,595	2546.8	− 2552	−5.2	× 51 / 180	−1.5
Sum, rounded to a whole point						−7

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	22,501	2426.2	− 2436	−9.8	× 37 / 165	−2.2
4	22,502	2479.1	− 2485	−5.9	× 34 / 165	−1.2
5	22,503	2498.7	− 2528	−29.3	× 47 / 165	−8.3
6	22,504	2526.4	− 2552	−25.6	× 47 / 165	−7.3
Sum, rounded to a whole point						−19

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −12, −11, −12, −12, −7, −22, −8, −7, −19 → −12.2
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 1 · 2016→2017: 1 · 2017→2018: 0 · 2018→2019: 5 · 2019→2022: 15 · 2022→2023: 14 · 2023→2024: 1 · 2024→2025: 12 → average 6.1
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 6.1 × 2.66 = 16.2. Upper limit 4, lower limit −28.4.

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.