Alameda Community Learning Center: 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	315	2595.1	− 2552	43.1	× 64 / 232	11.9
7	317	2615.6	− 2567	48.6	× 60 / 232	12.6
8	319	2613.5	− 2586	27.5	× 59 / 232	7
11	321	2638.0	− 2628	10	× 49 / 232	2.1
Sum, rounded to a whole point						34

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	253	2573.5	− 2552	21.5	× 60 / 216	6
7	255	2615.2	− 2567	48.2	× 55 / 216	12.3
8	256	2619.9	− 2586	33.9	× 56 / 216	8.8
11	259	2642.7	− 2628	14.7	× 45 / 216	3.1
Sum, rounded to a whole point						30

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	254	2540.8	− 2552	−11.2	× 48 / 189	−2.8
7	257	2612.9	− 2567	45.9	× 56 / 189	13.6
8	258	2595.0	− 2586	9	× 48 / 189	2.3
11	261	2610.2	− 2628	−17.8	× 37 / 189	−3.5
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
6	274	2553.8	− 2552	1.8	× 55 / 199	0.5
7	277	2571.1	− 2567	4.1	× 54 / 199	1.1
8	278	2611.4	− 2586	25.4	× 58 / 199	7.4
11	281	2589.8	− 2628	−38.2	× 32 / 199	−6.1
Sum, rounded to a whole point						3

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	303	2545.2	− 2552	−6.8	× 50 / 215	−1.6
7	304	2567.2	− 2567	0.2	× 58 / 215	0.1
8	305	2598.5	− 2586	12.5	× 56 / 215	3.3
11	306	2650.7	− 2628	22.7	× 51 / 215	5.4
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
6	299	2531.2	− 2552	−20.8	× 58 / 214	−5.6
7	300	2538.6	− 2567	−28.4	× 55 / 214	−7.3
8	301	2518.1	− 2586	−67.9	× 53 / 214	−16.8
11	302	2568.5	− 2628	−59.5	× 48 / 214	−13.3
Sum, rounded to a whole point						−43

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	307	2556.1	− 2552	4.1	× 49 / 203	1
7	308	2554.2	− 2567	−12.8	× 55 / 203	−3.5
8	309	2519.1	− 2586	−66.9	× 54 / 203	−17.8
11	310	2595.2	− 2628	−32.8	× 45 / 203	−7.3
Sum, rounded to a whole point						−28

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	307	2501.7	− 2552	−50.3	× 43 / 202	−10.7
7	308	2565.0	− 2567	−2	× 52 / 202	−0.5
8	309	2533.3	− 2586	−52.7	× 57 / 202	−14.9
11	310	2515.0	− 2628	−113	× 50 / 202	−28
Sum, rounded to a whole point						−54

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	305	2523.7	− 2552	−28.3	× 23 / 171	−3.8
7	306	2542.8	− 2567	−24.2	× 39 / 171	−5.5
8	307	2604.1	− 2586	18.1	× 52 / 171	5.5
11	308	2530.5	− 2628	−97.5	× 57 / 171	−32.5
Sum, rounded to a whole point						−36

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. 34, 30, 10, 3, 7, −43, −28, −54, −36 → −8.6
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 4 · 2016→2017: 20 · 2017→2018: 7 · 2018→2019: 4 · 2019→2022: 50 · 2022→2023: 15 · 2023→2024: 26 · 2024→2025: 18 → average 18
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 18 × 2.66 = 47.9. Upper limit 39.3, lower limit −56.5.

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.