Lopez 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	36,571	2368.5	− 2436	−67.5	× 97 / 349	−18.8
4	36,573	2410.4	− 2485	−74.6	× 74 / 349	−15.8
5	36,575	2433.7	− 2528	−94.3	× 92 / 349	−24.9
6	36,577	2432.6	− 2552	−119.4	× 86 / 349	−29.4
Sum, rounded to a whole point						−89

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	34,071	2370.7	− 2436	−65.3	× 101 / 360	−18.3
4	34,073	2395.1	− 2485	−89.9	× 94 / 360	−23.5
5	34,074	2430.9	− 2528	−97.1	× 72 / 360	−19.4
6	34,076	2438.3	− 2552	−113.7	× 93 / 360	−29.4
Sum, rounded to a whole point						−91

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	34,667	2396.5	− 2436	−39.5	× 77 / 325	−9.4
4	34,669	2409.7	− 2485	−75.3	× 95 / 325	−22
5	34,671	2430.9	− 2528	−97.1	× 90 / 325	−26.9
6	34,672	2422.2	− 2552	−129.8	× 63 / 325	−25.2
Sum, rounded to a whole point						−83

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	34,670	2413.0	− 2436	−23	× 79 / 319	−5.7
4	34,672	2432.3	− 2485	−52.7	× 67 / 319	−11.1
5	34,674	2456.5	− 2528	−71.5	× 88 / 319	−19.7
6	34,676	2432.4	− 2552	−119.6	× 85 / 319	−31.9
Sum, rounded to a whole point						−68

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	34,842	2397.0	− 2436	−39	× 78 / 309	−9.8
4	34,843	2459.8	− 2485	−25.2	× 87 / 309	−7.1
5	34,844	2456.1	− 2528	−71.9	× 62 / 309	−14.4
6	34,845	2444.2	− 2552	−107.8	× 82 / 309	−28.6
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	34,743	2383.3	− 2436	−52.7	× 65 / 270	−12.7
4	34,744	2398.0	− 2485	−87	× 75 / 270	−24.2
5	34,745	2409.7	− 2528	−118.3	× 67 / 270	−29.4
6	34,746	2453.4	− 2552	−98.6	× 63 / 270	−23
Sum, rounded to a whole point						−89

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	34,806	2369.3	− 2436	−66.7	× 63 / 258	−16.3
4	34,807	2426.4	− 2485	−58.6	× 64 / 258	−14.5
5	34,808	2395.7	− 2528	−132.3	× 73 / 258	−37.4
6	34,809	2413.1	− 2552	−138.9	× 58 / 258	−31.2
Sum, rounded to a whole point						−99

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	34,660	2366.8	− 2436	−69.2	× 58 / 257	−15.6
4	34,661	2382.9	− 2485	−102.1	× 64 / 257	−25.4
5	34,662	2439.6	− 2528	−88.4	× 72 / 257	−24.8
6	34,663	2399.5	− 2552	−152.5	× 63 / 257	−37.4
Sum, rounded to a whole point						−103

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	34,507	2350.4	− 2436	−85.6	× 45 / 230	−16.7
4	34,508	2385.1	− 2485	−99.9	× 59 / 230	−25.6
5	34,509	2423.0	− 2528	−105	× 63 / 230	−28.8
6	34,510	2401.1	− 2552	−150.9	× 63 / 230	−41.3
Sum, rounded to a whole point						−112

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −89, −91, −83, −68, −60, −89, −99, −103, −112 → −88.2
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 2 · 2016→2017: 8 · 2017→2018: 15 · 2018→2019: 8 · 2019→2022: 29 · 2022→2023: 10 · 2023→2024: 4 · 2024→2025: 9 → average 10.6
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 10.6 × 2.66 = 28.2. Upper limit −60, lower limit −116.4.

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.