Henry F. Kammann 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	46,067	2387.4	− 2436	−48.6	× 129 / 503	−12.5
4	46,070	2424.3	− 2485	−60.7	× 141 / 503	−17
5	46,071	2466.5	− 2528	−61.5	× 119 / 503	−14.5
6	46,074	2481.9	− 2552	−70.1	× 114 / 503	−15.9
Sum, rounded to a whole point						−60

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	42,770	2382.5	− 2436	−53.5	× 111 / 450	−13.2
4	42,772	2422.7	− 2485	−62.3	× 102 / 450	−14.1
5	42,774	2448.1	− 2528	−79.9	× 123 / 450	−21.8
6	42,775	2474.5	− 2552	−77.5	× 114 / 450	−19.6
Sum, rounded to a whole point						−69

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	43,845	2405.1	− 2436	−30.9	× 131 / 480	−8.4
4	43,846	2413.0	− 2485	−72	× 116 / 480	−17.4
5	43,849	2438.6	− 2528	−89.4	× 110 / 480	−20.5
6	43,851	2451.7	− 2552	−100.3	× 123 / 480	−25.7
Sum, rounded to a whole point						−72

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	43,862	2393.5	− 2436	−42.5	× 105 / 460	−9.7
4	43,863	2435.6	− 2485	−49.4	× 132 / 460	−14.2
5	43,866	2437.3	− 2528	−90.7	× 114 / 460	−22.5
6	43,867	2455.4	− 2552	−96.6	× 109 / 460	−22.9
Sum, rounded to a whole point						−69

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	43,993	2414.6	− 2436	−21.4	× 83 / 403	−4.4
4	43,994	2440.5	− 2485	−44.5	× 100 / 403	−11
5	43,995	2460.0	− 2528	−68	× 109 / 403	−18.4
6	43,996	2452.0	− 2552	−100	× 111 / 403	−27.5
Sum, rounded to a whole point						−61

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	43,743	2380.6	− 2436	−55.4	× 98 / 378	−14.4
4	43,744	2419.6	− 2485	−65.4	× 103 / 378	−17.8
5	43,745	2453.0	− 2528	−75	× 94 / 378	−18.7
6	43,746	2473.3	− 2552	−78.7	× 83 / 378	−17.3
Sum, rounded to a whole point						−68

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	43,735	2353.9	− 2436	−82.1	× 94 / 389	−19.8
4	43,736	2402.7	− 2485	−82.3	× 106 / 389	−22.4
5	43,737	2460.8	− 2528	−67.2	× 100 / 389	−17.3
6	43,738	2448.0	− 2552	−104	× 89 / 389	−23.8
Sum, rounded to a whole point						−83

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	43,557	2383.7	− 2436	−52.3	× 95 / 379	−13.1
4	43,558	2401.2	− 2485	−83.8	× 89 / 379	−19.7
5	43,559	2440.8	− 2528	−87.2	× 97 / 379	−22.3
6	43,560	2454.0	− 2552	−98	× 98 / 379	−25.3
Sum, rounded to a whole point						−80

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	43,306	2372.5	− 2436	−63.5	× 109 / 395	−17.5
4	43,307	2407.4	− 2485	−77.6	× 89 / 395	−17.5
5	43,308	2424.5	− 2528	−103.5	× 99 / 395	−25.9
6	43,309	2434.7	− 2552	−117.3	× 98 / 395	−29.1
Sum, rounded to a whole point						−90

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −60, −69, −72, −69, −61, −68, −83, −80, −90 → −72.4
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 9 · 2016→2017: 3 · 2017→2018: 3 · 2018→2019: 8 · 2019→2022: 7 · 2022→2023: 15 · 2023→2024: 3 · 2024→2025: 10 → average 7.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 7.3 × 2.66 = 19.4. Upper limit −53, lower limit −91.8.

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.