North Oakland Community Charter: 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	3,123	2434.8	− 2436	−1.2	× 22 / 143	−0.2
4	3,124	2492.8	− 2485	7.8	× 26 / 143	1.4
5	3,127	2526.8	− 2528	−1.2	× 23 / 143	−0.2
6	3,128	2534.3	− 2552	−17.7	× 26 / 143	−3.2
7	3,131	2597.5	− 2567	30.5	× 22 / 143	4.7
8	3,132	2655.3	− 2586	69.3	× 24 / 143	11.6
Sum, rounded to a whole point						14

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	2,833	2478.2	− 2436	42.2	× 20 / 145	5.8
4	2,834	2467.3	− 2485	−17.7	× 26 / 145	−3.2
5	2,837	2560.8	− 2528	32.8	× 26 / 145	5.9
6	2,838	2476.3	− 2552	−75.7	× 21 / 145	−11
7	2,841	2529.5	− 2567	−37.5	× 25 / 145	−6.5
8	2,842	2554.1	− 2586	−31.9	× 27 / 145	−5.9
Sum, rounded to a whole point						−15

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	2,907	2451.5	− 2436	15.5	× 20 / 148	2.1
4	2,908	2480.7	− 2485	−4.3	× 26 / 148	−0.8
5	2,910	2475.7	− 2528	−52.3	× 26 / 148	−9.2
6	2,913	2510.4	− 2552	−41.6	× 27 / 148	−7.6
7	2,915	2507.1	− 2567	−59.9	× 25 / 148	−10.1
8	2,916	2524.8	− 2586	−61.2	× 24 / 148	−9.9
Sum, rounded to a whole point						−35

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	2,908	2402.8	− 2436	−33.2	× 21 / 125	−5.6
4	2,911	2478.7	− 2485	−6.3	× 18 / 125	−0.9
5	2,912	2500.0	− 2528	−28	× 22 / 125	−4.9
6	2,915	2458.5	− 2552	−93.5	× 20 / 125	−15
7	2,916	2495.8	− 2567	−71.2	× 25 / 125	−14.2
8	2,919	2465.9	− 2586	−120.1	× 19 / 125	−18.3
Sum, rounded to a whole point						−59

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	2,935	2383.4	− 2436	−52.6	× 18 / 92	−10.3
4	2,936	2425.5	− 2485	−59.5	× 17 / 92	−11
5	2,937	2403.6	− 2528	−124.4	× 12 / 92	−16.2
6	2,938	2413.9	− 2552	−138.1	× 14 / 92	−21
7	2,939	2491.3	− 2567	−75.7	× 11 / 92	−9.1
8	2,940	2491.2	− 2586	−94.8	× 20 / 92	−20.6
Sum, rounded to a whole point						−88

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	2,836	2376.4	− 2436	−59.6	× 25 / 68	−21.9
4	2,837	2417.6	− 2485	−67.4	× 24 / 68	−23.8
5	2,838	2407.5	− 2528	−120.5	× 19 / 68	−33.7
Sum, rounded to a whole point						−79

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	2,770	2359.2	− 2436	−76.8	× 13 / 50	−20
4	2,771	2425.2	− 2485	−59.8	× 17 / 50	−20.3
5	2,772	2427.1	− 2528	−100.9	× 20 / 50	−40.4
Sum, rounded to a whole point						−81

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	2,734	2394.2	− 2436	−41.8	× 21 / 59	−14.9
4	2,735	2383.4	− 2485	−101.6	× 17 / 59	−29.3
5	2,736	2457.1	− 2528	−70.9	× 21 / 59	−25.2
Sum, rounded to a whole point						−69

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. 14, −15, −35, −59, −88, −79, −81, −69 → −51.5
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 29 · 2016→2017: 20 · 2017→2018: 24 · 2018→2019: 29 · 2019→2022: 9 · 2022→2023: 2 · 2023→2024: 12 → average 17.9
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 17.9 × 2.66 = 47.6. Upper limit −3.9, lower limit −99.1.

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.