Chet F. Harritt 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	75,563	2392.7	− 2436	−43.3	× 59 / 339	−7.5
4	75,565	2465.9	− 2485	−19.1	× 75 / 339	−4.2
5	75,567	2496.7	− 2528	−31.3	× 48 / 339	−4.4
6	75,569	2492.0	− 2552	−60	× 64 / 339	−11.3
7	75,571	2549.1	− 2567	−17.9	× 43 / 339	−2.3
8	75,573	2547.9	− 2586	−38.1	× 50 / 339	−5.6
Sum, rounded to a whole point						−35

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	70,080	2419.5	− 2436	−16.5	× 56 / 348	−2.7
4	70,083	2479.7	− 2485	−5.3	× 55 / 348	−0.8
5	70,084	2520.5	− 2528	−7.5	× 73 / 348	−1.6
6	70,087	2520.5	− 2552	−31.5	× 59 / 348	−5.3
7	70,088	2532.1	− 2567	−34.9	× 63 / 348	−6.3
8	70,090	2566.6	− 2586	−19.4	× 42 / 348	−2.3
Sum, rounded to a whole point						−19

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	71,934	2433.5	− 2436	−2.5	× 74 / 363	−0.5
4	71,936	2499.4	− 2485	14.4	× 54 / 363	2.1
5	71,938	2510.1	− 2528	−17.9	× 54 / 363	−2.7
6	71,939	2533.4	− 2552	−18.6	× 58 / 363	−3
7	71,941	2587.6	− 2567	20.6	× 59 / 363	3.3
8	71,943	2549.0	− 2586	−37	× 64 / 363	−6.5
Sum, rounded to a whole point						−7

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	72,075	2463.3	− 2436	27.3	× 72 / 355	5.5
4	72,076	2492.3	− 2485	7.3	× 72 / 355	1.5
5	72,079	2510.9	− 2528	−17.1	× 51 / 355	−2.5
6	72,080	2507.2	− 2552	−44.8	× 49 / 355	−6.2
7	72,083	2552.6	− 2567	−14.4	× 55 / 355	−2.2
8	72,084	2574.1	− 2586	−11.9	× 56 / 355	−1.9
Sum, rounded to a whole point						−6

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	72,567	2454.7	− 2436	18.7	× 83 / 365	4.3
4	72,568	2509.8	− 2485	24.8	× 68 / 365	4.6
5	72,569	2542.6	− 2528	14.6	× 62 / 365	2.5
6	72,570	2502.6	− 2552	−49.4	× 48 / 365	−6.5
7	72,571	2526.4	− 2567	−40.6	× 48 / 365	−5.3
8	72,572	2577.5	− 2586	−8.5	× 56 / 365	−1.3
Sum, rounded to a whole point						−2

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	71,050	2450.4	− 2436	14.4	× 55 / 333	2.4
4	71,051	2479.6	− 2485	−5.4	× 49 / 333	−0.8
5	71,052	2510.5	− 2528	−17.5	× 63 / 333	−3.3
6	71,053	2521.7	− 2552	−30.3	× 51 / 333	−4.6
7	71,054	2548.4	− 2567	−18.6	× 85 / 333	−4.7
8	71,055	2558.3	− 2586	−27.7	× 30 / 333	−2.5
Sum, rounded to a whole point						−14

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	72,645	2454.1	− 2436	18.1	× 70 / 378	3.4
4	72,646	2506.1	− 2485	21.1	× 67 / 378	3.7
5	72,647	2508.2	− 2528	−19.8	× 60 / 378	−3.1
6	72,648	2523.1	− 2552	−28.9	× 81 / 378	−6.2
7	72,649	2549.2	− 2567	−17.8	× 52 / 378	−2.4
8	72,650	2556.5	− 2586	−29.5	× 48 / 378	−3.7
Sum, rounded to a whole point						−8

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	72,643	2446.4	− 2436	10.4	× 71 / 391	1.9
4	72,644	2514.7	− 2485	29.7	× 60 / 391	4.6
5	72,645	2515.3	− 2528	−12.7	× 70 / 391	−2.3
6	72,646	2505.9	− 2552	−46.1	× 57 / 391	−6.7
7	72,647	2539.9	− 2567	−27.1	× 78 / 391	−5.4
8	72,648	2524.7	− 2586	−61.3	× 55 / 391	−8.6
Sum, rounded to a whole point						−17

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	72,625	2431.9	− 2436	−4.1	× 63 / 398	−0.6
4	72,626	2507.2	− 2485	22.2	× 69 / 398	3.8
5	72,627	2549.2	− 2528	21.2	× 60 / 398	3.2
6	72,628	2522.3	− 2552	−29.7	× 64 / 398	−4.8
7	72,629	2516.8	− 2567	−50.2	× 65 / 398	−8.2
8	72,630	2545.8	− 2586	−40.2	× 77 / 398	−7.8
Sum, rounded to a whole point						−14

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	72,339	2431.0	− 2436	−5	× 69 / 383	−0.9
4	72,340	2496.0	− 2485	11	× 61 / 383	1.8
5	72,341	2498.1	− 2528	−29.9	× 66 / 383	−5.2
6	72,342	2557.7	− 2552	5.7	× 60 / 383	0.9
7	72,343	2547.2	− 2567	−19.8	× 66 / 383	−3.4
8	72,344	2518.6	− 2586	−67.4	× 61 / 383	−10.7
Sum, rounded to a whole point						−18

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −35, −19, −7, −6, −2, −14, −8, −17, −14, −18 → −14
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 16 · 2016→2017: 12 · 2017→2018: 1 · 2018→2019: 4 · 2019→2021: 12 · 2021→2022: 6 · 2022→2023: 9 · 2023→2024: 3 · 2024→2025: 4 → 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 5.7, lower limit −33.7.

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.