Joe Stefani: english

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	44,361	2393.1	− 2432	−38.9	× 167 / 515	−12.6
4	44,364	2431.6	− 2473	−41.4	× 159 / 515	−12.8
5	44,366	2470.9	− 2502	−31.1	× 189 / 515	−11.4
Sum, rounded to a whole point						−37

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,061	2412.8	− 2432	−19.2	× 72 / 612	−2.3
4	41,063	2445.8	− 2473	−27.2	× 182 / 612	−8.1
5	41,065	2471.0	− 2502	−31	× 160 / 612	−8.1
6	41,068	2494.1	− 2531	−36.9	× 198 / 612	−11.9
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
3	42,077	2413.1	− 2432	−18.9	× 69 / 571	−2.3
4	42,079	2446.7	− 2473	−26.3	× 165 / 571	−7.6
5	42,081	2445.7	− 2502	−56.3	× 178 / 571	−17.6
6	42,083	2502.8	− 2531	−28.2	× 159 / 571	−7.9
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	42,091	2420.3	− 2432	−11.7	× 97 / 590	−1.9
4	42,094	2456.8	− 2473	−16.2	× 134 / 590	−3.7
5	42,095	2468.9	− 2502	−33.1	× 176 / 590	−9.9
6	42,098	2479.8	− 2531	−51.2	× 183 / 590	−15.9
Sum, rounded to a whole point						−31

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	42,229	2416.2	− 2432	−15.8	× 100 / 590	−2.7
4	42,230	2448.9	− 2473	−24.1	× 167 / 590	−6.8
5	42,231	2474.0	− 2502	−28	× 132 / 590	−6.3
6	42,232	2489.4	− 2531	−41.6	× 191 / 590	−13.5
Sum, rounded to a whole point						−29

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,998	2367.4	− 2432	−64.6	× 110 / 626	−11.4
4	41,999	2424.3	− 2473	−48.7	× 185 / 626	−14.4
5	42,000	2451.3	− 2502	−50.7	× 162 / 626	−13.1
6	42,001	2482.5	− 2531	−48.5	× 169 / 626	−13.1
Sum, rounded to a whole point						−52

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	42,023	2363.9	− 2432	−68.1	× 128 / 620	−14.1
4	42,024	2440.8	− 2473	−32.2	× 151 / 620	−7.8
5	42,025	2430.9	− 2502	−71.1	× 172 / 620	−19.7
6	42,026	2489.5	− 2531	−41.5	× 169 / 620	−11.3
Sum, rounded to a whole point						−53

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,854	2387.7	− 2432	−44.3	× 111 / 612	−8
4	41,855	2447.7	− 2473	−25.3	× 178 / 612	−7.4
5	41,856	2443.0	− 2502	−59	× 155 / 612	−14.9
6	41,857	2483.0	− 2531	−48	× 168 / 612	−13.2
Sum, rounded to a whole point						−44

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	41,613	2365.0	− 2432	−67	× 127 / 619	−13.7
4	41,614	2448.7	− 2473	−24.3	× 160 / 619	−6.3
5	41,615	2472.3	− 2502	−29.7	× 166 / 619	−8
6	41,616	2502.0	− 2531	−29	× 166 / 619	−7.8
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. −37, −30, −35, −31, −29, −52, −53, −44, −36 → −38.6
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 7 · 2016→2017: 5 · 2017→2018: 4 · 2018→2019: 2 · 2019→2022: 23 · 2022→2023: 1 · 2023→2024: 9 · 2024→2025: 8 → average 7.4
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 7.4 × 2.66 = 19.7. Upper limit −18.9, lower limit −58.3.

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.