Humboldt: math · Schoolio

The shaded band is this county'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	13,314	2403.5	− 2436	−32.5	× 1408 / 9177	−5
4	13,317	2441.6	− 2485	−43.4	× 1395 / 9177	−6.6
5	13,318	2465.8	− 2528	−62.2	× 1313 / 9177	−8.9
6	13,321	2502.0	− 2552	−50	× 1325 / 9177	−7.2
7	13,322	2512.9	− 2567	−54.1	× 1214 / 9177	−7.2
8	13,325	2529.1	− 2586	−56.9	× 1337 / 9177	−8.3
11	13,326	2546.0	− 2628	−82	× 1185 / 9177	−10.6
Sum, rounded to a whole point						−54

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	12,334	2417.5	− 2436	−18.5	× 1380 / 9194	−2.8
4	12,336	2449.5	− 2485	−35.5	× 1423 / 9194	−5.5
5	12,338	2468.7	− 2528	−59.3	× 1400 / 9194	−9
6	12,341	2494.0	− 2552	−58	× 1327 / 9194	−8.4
7	12,343	2529.1	− 2567	−37.9	× 1325 / 9194	−5.5
8	12,345	2536.7	− 2586	−49.3	× 1196 / 9194	−6.4
11	12,346	2550.8	− 2628	−77.2	× 1143 / 9194	−9.6
Sum, rounded to a whole point						−47

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	12,665	2413.4	− 2436	−22.6	× 1415 / 9271	−3.4
4	12,667	2453.6	− 2485	−31.4	× 1370 / 9271	−4.6
5	12,670	2472.6	− 2528	−55.4	× 1397 / 9271	−8.3
6	12,671	2488.2	− 2552	−63.8	× 1380 / 9271	−9.5
7	12,674	2512.9	− 2567	−54.1	× 1305 / 9271	−7.6
8	12,675	2543.6	− 2586	−42.4	× 1275 / 9271	−5.8
11	12,678	2549.0	− 2628	−79	× 1129 / 9271	−9.6
Sum, rounded to a whole point						−49

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	12,687	2417.1	− 2436	−18.9	× 1333 / 9374	−2.7
4	12,690	2453.2	− 2485	−31.8	× 1383 / 9374	−4.7
5	12,691	2480.1	− 2528	−47.9	× 1335 / 9374	−6.8
6	12,694	2492.7	− 2552	−59.3	× 1401 / 9374	−8.9
7	12,695	2505.8	− 2567	−61.2	× 1355 / 9374	−8.8
8	12,698	2521.4	− 2586	−64.6	× 1284 / 9374	−8.8
11	12,699	2544.5	− 2628	−83.5	× 1283 / 9374	−11.4
Sum, rounded to a whole point						−52

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	12,790	2414.9	− 2436	−21.1	× 1337 / 9170	−3.1
4	12,791	2459.2	− 2485	−25.8	× 1292 / 9170	−3.6
5	12,792	2474.8	− 2528	−53.2	× 1390 / 9170	−8.1
6	12,793	2502.3	− 2552	−49.7	× 1303 / 9170	−7.1
7	12,794	2509.6	− 2567	−57.4	× 1359 / 9170	−8.5
8	12,795	2523.8	− 2586	−62.2	× 1326 / 9170	−9
11	12,796	2539.0	− 2628	−89	× 1163 / 9170	−11.3
Sum, rounded to a whole point						−51

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	12,636	2405.3	− 2436	−30.7	× 843 / 5974	−4.3
4	12,637	2443.5	− 2485	−41.5	× 876 / 5974	−6.1
5	12,638	2465.8	− 2528	−62.2	× 873 / 5974	−9.1
6	12,639	2477.1	− 2552	−74.9	× 876 / 5974	−11
7	12,640	2505.4	− 2567	−61.6	× 920 / 5974	−9.5
8	12,641	2520.1	− 2586	−65.9	× 890 / 5974	−9.8
11	12,642	2539.7	− 2628	−88.3	× 696 / 5974	−10.3
Sum, rounded to a whole point						−60

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	12,819	2405.9	− 2436	−30.1	× 1239 / 8764	−4.3
4	12,820	2448.6	− 2485	−36.4	× 1284 / 8764	−5.3
5	12,821	2465.0	− 2528	−63	× 1323 / 8764	−9.5
6	12,822	2486.8	− 2552	−65.2	× 1253 / 8764	−9.3
7	12,823	2493.5	− 2567	−73.5	× 1194 / 8764	−10
8	12,824	2503.5	− 2586	−82.5	× 1289 / 8764	−12.1
11	12,825	2520.5	− 2628	−107.5	× 1182 / 8764	−14.5
Sum, rounded to a whole point						−65

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	12,800	2410.7	− 2436	−25.3	× 1241 / 8642	−3.6
4	12,801	2450.6	− 2485	−34.4	× 1230 / 8642	−4.9
5	12,802	2472.0	− 2528	−56	× 1241 / 8642	−8
6	12,803	2486.7	− 2552	−65.3	× 1278 / 8642	−9.7
7	12,804	2504.1	− 2567	−62.9	× 1209 / 8642	−8.8
8	12,805	2492.2	− 2586	−93.8	× 1188 / 8642	−12.9
11	12,806	2523.9	− 2628	−104.1	× 1255 / 8642	−15.1
Sum, rounded to a whole point						−63

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	12,761	2409.3	− 2436	−26.7	× 1158 / 8466	−3.7
4	12,762	2454.3	− 2485	−30.7	× 1246 / 8466	−4.5
5	12,763	2472.5	− 2528	−55.5	× 1219 / 8466	−8
6	12,764	2489.9	− 2552	−62.1	× 1225 / 8466	−9
7	12,765	2505.3	− 2567	−61.7	× 1256 / 8466	−9.2
8	12,766	2516.7	− 2586	−69.3	× 1182 / 8466	−9.7
11	12,767	2529.0	− 2628	−99	× 1180 / 8466	−13.8
Sum, rounded to a whole point						−58

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	12,736	2409.4	− 2436	−26.6	× 1205 / 8559	−3.7
4	12,737	2454.5	− 2485	−30.5	× 1206 / 8559	−4.3
5	12,738	2473.7	− 2528	−54.3	× 1239 / 8559	−7.9
6	12,739	2487.1	− 2552	−64.9	× 1203 / 8559	−9.1
7	12,740	2518.2	− 2567	−48.8	× 1211 / 8559	−6.9
8	12,741	2520.1	− 2586	−65.9	× 1242 / 8559	−9.6
11	12,742	2526.9	− 2628	−101.1	× 1253 / 8559	−14.8
Sum, rounded to a whole point						−56

2026 from sb_ca2026_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	12,752	2407.6	− 2436	−28.4	× 1146 / 8294	−3.9
4	12,753	2449.5	− 2485	−35.5	× 1228 / 8294	−5.3
5	12,754	2470.7	− 2528	−57.3	× 1199 / 8294	−8.3
6	12,755	2491.3	− 2552	−60.7	× 1208 / 8294	−8.8
7	12,756	2504.9	− 2567	−62.1	× 1156 / 8294	−8.7
8	12,757	2524.7	− 2586	−61.3	× 1205 / 8294	−8.9
11	12,758	2529.6	− 2628	−98.4	× 1152 / 8294	−13.7
Sum, rounded to a whole point						−58

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −54, −47, −49, −52, −51, −60, −65, −63, −58, −56, −58 → −55.7
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: 2 · 2017→2018: 3 · 2018→2019: 1 · 2019→2021: 9 · 2021→2022: 5 · 2022→2023: 2 · 2023→2024: 5 · 2024→2025: 2 · 2025→2026: 2 → average 3.8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 3.8 × 2.66 = 10.1. Upper limit −45.6, lower limit −65.8.

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 — for a county, 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.