Steele Lane 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	95,200	2386.7	− 2436	−49.3	× 60 / 227	−13
4	95,203	2404.5	− 2485	−80.5	× 62 / 227	−22
5	95,204	2430.0	− 2528	−98	× 51 / 227	−22
6	95,207	2460.2	− 2552	−91.8	× 54 / 227	−21.8
Sum, rounded to a whole point						−79

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	88,425	2381.2	− 2436	−54.8	× 62 / 226	−15
4	88,428	2402.1	− 2485	−82.9	× 60 / 226	−22
5	88,429	2415.5	− 2528	−112.5	× 54 / 226	−26.9
6	88,431	2456.1	− 2552	−95.9	× 50 / 226	−21.2
Sum, rounded to a whole point						−85

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	90,985	2386.0	− 2436	−50	× 61 / 231	−13.2
4	90,987	2393.5	− 2485	−91.5	× 60 / 231	−23.8
5	90,989	2418.9	− 2528	−109.1	× 56 / 231	−26.4
6	90,990	2394.8	− 2552	−157.2	× 54 / 231	−36.7
Sum, rounded to a whole point						−100

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,840	2365.3	− 2436	−70.7	× 62 / 229	−19.1
4	91,841	2406.4	− 2485	−78.6	× 53 / 229	−18.2
5	91,842	2446.8	− 2528	−81.2	× 59 / 229	−20.9
6	91,843	2447.5	− 2552	−104.5	× 55 / 229	−25.1
Sum, rounded to a whole point						−83

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	92,086	2363.9	− 2436	−72.1	× 52 / 198	−18.9
4	92,087	2394.8	− 2485	−90.2	× 41 / 198	−18.7
5	92,088	2411.5	− 2528	−116.5	× 52 / 198	−30.6
6	92,089	2418.4	− 2552	−133.6	× 53 / 198	−35.8
Sum, rounded to a whole point						−104

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,998	2352.2	− 2436	−83.8	× 46 / 193	−20
4	91,999	2395.1	− 2485	−89.9	× 48 / 193	−22.4
5	92,000	2402.5	− 2528	−125.5	× 46 / 193	−29.9
6	92,001	2435.8	− 2552	−116.2	× 53 / 193	−31.9
Sum, rounded to a whole point						−104

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,927	2336.6	− 2436	−99.4	× 48 / 198	−24.1
4	91,928	2368.1	− 2485	−116.9	× 50 / 198	−29.5
5	91,929	2388.7	− 2528	−139.3	× 54 / 198	−38
6	91,930	2393.7	− 2552	−158.3	× 46 / 198	−36.8
Sum, rounded to a whole point						−128

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,637	2358.9	− 2436	−77.1	× 65 / 225	−22.3
4	91,638	2371.6	− 2485	−113.4	× 47 / 225	−23.7
5	91,639	2379.8	− 2528	−148.2	× 55 / 225	−36.2
6	91,640	2416.7	− 2552	−135.3	× 58 / 225	−34.9
Sum, rounded to a whole point						−117

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −79, −85, −100, −83, −104, −104, −128, −117 → −100
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 6 · 2016→2017: 15 · 2017→2019: 17 · 2019→2022: 21 · 2022→2023: 0 · 2023→2024: 24 · 2024→2025: 11 → average 13.4
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 13.4 × 2.66 = 35.6. Upper limit −64.4, lower limit −135.6.

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.