West Oakland Middle: 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	2,499	2413.0	− 2552	−139	× 73 / 222	−45.7
7	2,500	2416.9	− 2567	−150.1	× 71 / 222	−48
8	2,503	2437.6	− 2586	−148.4	× 78 / 222	−52.1
Sum, rounded to a whole point						−146

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	2,182	2394.1	− 2552	−157.9	× 62 / 189	−51.8
7	2,185	2422.8	− 2567	−144.2	× 63 / 189	−48.1
8	2,186	2421.4	− 2586	−164.6	× 64 / 189	−55.7
Sum, rounded to a whole point						−156

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	2,243	2416.7	− 2552	−135.3	× 46 / 175	−35.6
7	2,245	2436.9	− 2567	−130.1	× 63 / 175	−46.8
8	2,246	2444.2	− 2586	−141.8	× 66 / 175	−53.5
Sum, rounded to a whole point						−136

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	2,233	2404.3	− 2552	−147.7	× 68 / 191	−52.6
7	2,234	2433.8	− 2567	−133.2	× 54 / 191	−37.7
8	2,237	2438.4	− 2586	−147.6	× 69 / 191	−53.3
Sum, rounded to a whole point						−144

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	2,242	2415.0	− 2552	−137	× 72 / 187	−52.7
7	2,243	2408.0	− 2567	−159	× 65 / 187	−55.3
8	2,244	2443.4	− 2586	−142.6	× 50 / 187	−38.1
Sum, rounded to a whole point						−146

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	2,200	2403.6	− 2552	−148.4	× 50 / 163	−45.5
7	2,201	2448.4	− 2567	−118.6	× 59 / 163	−42.9
8	2,202	2488.6	− 2586	−97.4	× 54 / 163	−32.3
Sum, rounded to a whole point						−121

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	2,152	2379.3	− 2552	−172.7	× 59 / 162	−62.9
7	2,153	2427.2	− 2567	−139.8	× 47 / 162	−40.6
8	2,154	2457.3	− 2586	−128.7	× 56 / 162	−44.5
Sum, rounded to a whole point						−148

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	2,120	2412.3	− 2552	−139.7	× 40 / 152	−36.8
7	2,121	2436.3	− 2567	−130.7	× 59 / 152	−50.7
8	2,122	2441.8	− 2586	−144.2	× 53 / 152	−50.3
Sum, rounded to a whole point						−138

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	2,094	2382.1	− 2552	−169.9	× 70 / 163	−73
7	2,095	2443.4	− 2567	−123.6	× 40 / 163	−30.3
8	2,096	2456.9	− 2586	−129.1	× 53 / 163	−42
Sum, rounded to a whole point						−145

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −146, −156, −136, −144, −146, −121, −148, −138, −145 → −142.2
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 10 · 2016→2017: 20 · 2017→2018: 8 · 2018→2019: 2 · 2019→2022: 25 · 2022→2023: 27 · 2023→2024: 10 · 2024→2025: 7 → average 13.6
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 13.6 × 2.66 = 36.2. Upper limit −106, lower limit −178.4.

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.