Lakeport Unified: math

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
3	19,455	2411.7	− 2436	−24.3	× 132 / 738	−4.3
4	19,458	2445.4	− 2485	−39.6	× 114 / 738	−6.1
5	19,459	2461.3	− 2528	−66.7	× 110 / 738	−9.9
6	19,462	2522.5	− 2552	−29.5	× 119 / 738	−4.8
7	19,463	2520.4	− 2567	−46.6	× 85 / 738	−5.4
8	19,466	2552.1	− 2586	−33.9	× 88 / 738	−4
11	19,467	2576.0	− 2628	−52	× 90 / 738	−6.3
Sum, rounded to a whole point						−41

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,473	2434.2	− 2436	−1.8	× 107 / 783	−0.2
4	18,476	2435.9	− 2485	−49.1	× 132 / 783	−8.3
5	18,478	2457.5	− 2528	−70.5	× 120 / 783	−10.8
6	18,480	2489.6	− 2552	−62.4	× 115 / 783	−9.2
7	18,481	2526.4	− 2567	−40.6	× 123 / 783	−6.4
8	18,483	2516.8	− 2586	−69.2	× 85 / 783	−7.5
11	18,486	2553.6	− 2628	−74.4	× 101 / 783	−9.6
Sum, rounded to a whole point						−52

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,805	2431.4	− 2436	−4.6	× 110 / 799	−0.6
4	18,807	2447.6	− 2485	−37.4	× 109 / 799	−5.1
5	18,809	2467.9	− 2528	−60.1	× 125 / 799	−9.4
6	18,811	2488.6	− 2552	−63.4	× 114 / 799	−9
7	18,813	2501.7	− 2567	−65.3	× 116 / 799	−9.5
8	18,815	2528.1	− 2586	−57.9	× 107 / 799	−7.8
11	18,817	2542.3	− 2628	−85.7	× 118 / 799	−12.7
Sum, rounded to a whole point						−54

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,824	2408.1	− 2436	−27.9	× 100 / 745	−3.7
4	18,827	2455.8	− 2485	−29.2	× 108 / 745	−4.2
5	18,828	2479.4	− 2528	−48.6	× 107 / 745	−7
6	18,831	2486.0	− 2552	−66	× 113 / 745	−10
7	18,832	2493.3	− 2567	−73.7	× 117 / 745	−11.6
8	18,835	2503.5	− 2586	−82.5	× 111 / 745	−12.3
11	18,836	2566.7	− 2628	−61.3	× 89 / 745	−7.3
Sum, rounded to a whole point						−56

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,973	2384.3	− 2436	−51.7	× 131 / 749	−9
4	18,974	2448.8	− 2485	−36.2	× 88 / 749	−4.3
5	18,975	2465.9	− 2528	−62.1	× 107 / 749	−8.9
6	18,976	2468.0	− 2552	−84	× 94 / 749	−10.5
7	18,977	2476.2	− 2567	−90.8	× 113 / 749	−13.7
8	18,978	2489.1	− 2586	−96.9	× 122 / 749	−15.8
11	18,979	2526.5	− 2628	−101.5	× 94 / 749	−12.7
Sum, rounded to a whole point						−75

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,496	2360.6	− 2436	−75.4	× 101 / 599	−12.7
4	18,497	2418.5	− 2485	−66.5	× 73 / 599	−8.1
5	18,498	2421.5	− 2528	−106.5	× 96 / 599	−17.1
6	18,499	2441.7	− 2552	−110.3	× 74 / 599	−13.6
7	18,500	2465.7	− 2567	−101.3	× 90 / 599	−15.2
8	18,501	2466.4	− 2586	−119.6	× 79 / 599	−15.8
11	18,502	2533.1	− 2628	−94.9	× 86 / 599	−13.6
Sum, rounded to a whole point						−96

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	19,020	2373.8	− 2436	−62.2	× 95 / 616	−9.6
4	19,021	2401.6	− 2485	−83.4	× 89 / 616	−12
5	19,022	2452.3	− 2528	−75.7	× 83 / 616	−10.2
6	19,023	2430.3	− 2552	−121.7	× 105 / 616	−20.7
7	19,024	2448.2	− 2567	−118.8	× 84 / 616	−16.2
8	19,025	2436.1	− 2586	−149.9	× 94 / 616	−22.9
11	19,026	2523.7	− 2628	−104.3	× 66 / 616	−11.2
Sum, rounded to a whole point						−103

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,975	2391.2	− 2436	−44.8	× 90 / 678	−5.9
4	18,976	2406.3	− 2485	−78.7	× 95 / 678	−11
5	18,977	2399.0	− 2528	−129	× 99 / 678	−18.8
6	18,978	2434.5	− 2552	−117.5	× 90 / 678	−15.6
7	18,979	2448.5	− 2567	−118.5	× 109 / 678	−19.1
8	18,980	2449.2	− 2586	−136.8	× 96 / 678	−19.4
11	18,981	2489.6	− 2628	−138.4	× 99 / 678	−20.2
Sum, rounded to a whole point						−110

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,919	2376.8	− 2436	−59.2	× 89 / 659	−8
4	18,920	2399.4	− 2485	−85.6	× 93 / 659	−12.1
5	18,921	2409.0	− 2528	−119	× 94 / 659	−17
6	18,922	2417.0	− 2552	−135	× 97 / 659	−19.9
7	18,923	2475.2	− 2567	−91.8	× 89 / 659	−12.4
8	18,924	2420.4	− 2586	−165.6	× 101 / 659	−25.4
11	18,925	2452.6	− 2628	−175.4	× 96 / 659	−25.6
Sum, rounded to a whole point						−120

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	18,914	2357.6	− 2436	−78.4	× 92 / 652	−11.1
4	18,915	2412.8	− 2485	−72.2	× 85 / 652	−9.4
5	18,916	2427.4	− 2528	−100.6	× 93 / 652	−14.3
6	18,917	2426.7	− 2552	−125.3	× 92 / 652	−17.7
7	18,918	2427.3	− 2567	−139.7	× 102 / 652	−21.9
8	18,919	2432.4	− 2586	−153.6	× 89 / 652	−21
11	18,920	2510.4	− 2628	−117.6	× 99 / 652	−17.9
Sum, rounded to a whole point						−113

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −41, −52, −54, −56, −75, −96, −103, −110, −120, −113 → −82
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 11 · 2016→2017: 2 · 2017→2018: 2 · 2018→2019: 19 · 2019→2021: 21 · 2021→2022: 7 · 2022→2023: 7 · 2023→2024: 10 · 2024→2025: 7 → average 9.6
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 9.6 × 2.66 = 25.5. Upper limit −56.5, lower limit −107.5.

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.