Humboldt County Office of Education: english

The shaded band is this district'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
8	13,334	2421.6	− 2567	−145.4	× 32 / 32	−145.4
Sum, rounded to a whole point						−145

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
8	12,353	2404.6	− 2567	−162.4	× 11 / 11	−162.4
Sum, rounded to a whole point						−162

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
8	12,685	2391.9	− 2567	−175.1	× 13 / 46	−49.5
11	12,687	2403.8	− 2583	−179.2	× 33 / 46	−128.6
Sum, rounded to a whole point						−178

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
8	12,706	2406.1	− 2567	−160.9	× 19 / 69	−44.3
11	12,707	2401.6	− 2583	−181.4	× 50 / 69	−131.4
Sum, rounded to a whole point						−176

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
8	12,801	2389.6	− 2567	−177.4	× 15 / 56	−47.5
11	12,802	2409.6	− 2583	−173.4	× 41 / 56	−127
Sum, rounded to a whole point						−174

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	12,646	2434.5	− 2583	−148.5	× 22 / 22	−148.5
Sum, rounded to a whole point						−149

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
8	12,829	2405.0	− 2567	−162	× 19 / 51	−60.4
11	12,830	2445.9	− 2583	−137.1	× 32 / 51	−86
Sum, rounded to a whole point						−146

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
8	12,809	2391.0	− 2567	−176	× 17 / 60	−49.9
11	12,810	2458.0	− 2583	−125	× 43 / 60	−89.6
Sum, rounded to a whole point						−139

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	12,771	2472.7	− 2583	−110.3	× 21 / 21	−110.3
Sum, rounded to a whole point						−110

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
8	12,745	2410.9	− 2567	−156.1	× 26 / 54	−75.2
11	12,746	2453.8	− 2583	−129.2	× 28 / 54	−67
Sum, rounded to a whole point						−142

2026 from sb_ca2026_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
7	12,760	2430.5	− 2552	−121.5	× 11 / 66	−20.3
8	12,761	2411.3	− 2567	−155.7	× 14 / 66	−33
11	12,762	2452.4	− 2583	−130.6	× 41 / 66	−81.1
Sum, rounded to a whole point						−134

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −145, −162, −178, −176, −174, −149, −146, −139, −110, −142, −134 → −150.5
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 17 · 2016→2017: 16 · 2017→2018: 2 · 2018→2019: 2 · 2019→2021: 25 · 2021→2022: 3 · 2022→2023: 7 · 2023→2024: 29 · 2024→2025: 32 · 2025→2026: 8 → average 14.1
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 14.1 × 2.66 = 37.5. Upper limit −113, lower limit −188.

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 — for a district, the total across its schools. From 2014–15, 2015–16, 2016–17, 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.

Humboldt County Office of Education