Isabelle Jackson Elementary: 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	60,330	2382.4	− 2432	−49.6	× 144 / 523	−13.7
4	60,332	2427.0	− 2473	−46	× 132 / 523	−11.6
5	60,334	2485.9	− 2502	−16.1	× 112 / 523	−3.4
6	60,336	2508.8	− 2531	−22.2	× 135 / 523	−5.7
Sum, rounded to a whole point						−34

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	56,027	2389.2	− 2432	−42.8	× 117 / 506	−9.9
4	56,029	2439.3	− 2473	−33.7	× 139 / 506	−9.3
5	56,031	2492.6	− 2502	−9.4	× 127 / 506	−2.4
6	56,034	2508.7	− 2531	−22.3	× 123 / 506	−5.4
Sum, rounded to a whole point						−27

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	57,660	2392.6	− 2432	−39.4	× 127 / 503	−9.9
4	57,663	2434.1	− 2473	−38.9	× 118 / 503	−9.1
5	57,664	2473.4	− 2502	−28.6	× 136 / 503	−7.7
6	57,666	2497.2	− 2531	−33.8	× 122 / 503	−8.2
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	57,795	2406.0	− 2432	−26	× 123 / 495	−6.5
4	57,798	2451.7	− 2473	−21.3	× 123 / 495	−5.3
5	57,800	2476.3	− 2502	−25.7	× 113 / 495	−5.9
6	57,802	2495.4	− 2531	−35.6	× 136 / 495	−9.8
Sum, rounded to a whole point						−27

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,046	2399.8	− 2432	−32.2	× 124 / 501	−8
4	58,047	2439.8	− 2473	−33.2	× 128 / 501	−8.5
5	58,048	2492.0	− 2502	−10	× 133 / 501	−2.7
6	58,049	2503.5	− 2531	−27.5	× 116 / 501	−6.4
Sum, rounded to a whole point						−25

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	56,733	2384.8	− 2432	−47.2	× 123 / 475	−12.2
4	56,734	2411.7	− 2473	−61.3	× 119 / 475	−15.4
5	56,735	2453.2	− 2502	−48.8	× 133 / 475	−13.7
6	56,736	2480.8	− 2531	−50.2	× 100 / 475	−10.6
Sum, rounded to a whole point						−52

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,087	2417.5	− 2432	−14.5	× 95 / 465	−3
4	58,088	2444.9	− 2473	−28.1	× 124 / 465	−7.5
5	58,089	2457.7	− 2502	−44.3	× 110 / 465	−10.5
6	58,090	2469.1	− 2531	−61.9	× 136 / 465	−18.1
Sum, rounded to a whole point						−39

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,061	2392.3	− 2432	−39.7	× 110 / 455	−9.6
4	58,062	2439.2	− 2473	−33.8	× 100 / 455	−7.4
5	58,063	2457.9	− 2502	−44.1	× 128 / 455	−12.4
6	58,064	2480.5	− 2531	−50.5	× 117 / 455	−13
Sum, rounded to a whole point						−42

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	57,958	2394.5	− 2432	−37.5	× 105 / 451	−8.7
4	57,959	2425.5	− 2473	−47.5	× 122 / 451	−12.8
5	57,960	2464.3	− 2502	−37.7	× 94 / 451	−7.9
6	57,961	2495.4	− 2531	−35.6	× 130 / 451	−10.3
Sum, rounded to a whole point						−40

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	57,717	2401.9	− 2432	−30.1	× 108 / 436	−7.5
4	57,718	2446.1	− 2473	−26.9	× 110 / 436	−6.8
5	57,719	2480.3	− 2502	−21.7	× 114 / 436	−5.7
6	57,720	2507.4	− 2531	−23.6	× 104 / 436	−5.6
Sum, rounded to a whole point						−26

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −34, −27, −35, −27, −25, −52, −39, −42, −40, −26 → −34.7
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: 8 · 2017→2018: 8 · 2018→2019: 2 · 2019→2021: 27 · 2021→2022: 13 · 2022→2023: 3 · 2023→2024: 2 · 2024→2025: 14 → average 9.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 9.3 × 2.66 = 24.7. Upper limit −10, lower limit −59.4.

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.