Leataata Floyd 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	61,618	2347.9	− 2436	−88.1	× 49 / 170	−25.4
4	61,620	2364.1	− 2485	−120.9	× 49 / 170	−34.8
5	61,622	2399.4	− 2528	−128.6	× 39 / 170	−29.5
6	61,624	2462.0	− 2552	−90	× 33 / 170	−17.5
Sum, rounded to a whole point						−107

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	57,179	2366.1	− 2436	−69.9	× 53 / 182	−20.4
4	57,182	2378.7	− 2485	−106.3	× 49 / 182	−28.6
5	57,184	2395.3	− 2528	−132.7	× 47 / 182	−34.3
6	57,186	2411.9	− 2552	−140.1	× 33 / 182	−25.4
Sum, rounded to a whole point						−109

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,855	2355.1	− 2436	−80.9	× 45 / 171	−21.3
4	58,856	2384.2	− 2485	−100.8	× 44 / 171	−25.9
5	58,859	2374.7	− 2528	−153.3	× 50 / 171	−44.8
6	58,861	2359.6	− 2552	−192.4	× 32 / 171	−36
Sum, rounded to a whole point						−128

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,969	2361.2	− 2436	−74.8	× 46 / 188	−18.3
4	58,972	2385.1	− 2485	−99.9	× 42 / 188	−22.3
5	58,973	2404.6	− 2528	−123.4	× 52 / 188	−34.1
6	58,976	2390.3	− 2552	−161.7	× 48 / 188	−41.3
Sum, rounded to a whole point						−116

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	59,225	2371.5	− 2436	−64.5	× 59 / 191	−19.9
4	59,226	2383.9	− 2485	−101.1	× 49 / 191	−25.9
5	59,227	2396.4	− 2528	−131.6	× 36 / 191	−24.8
6	59,228	2454.8	− 2552	−97.2	× 47 / 191	−23.9
Sum, rounded to a whole point						−95

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	59,308	2333.4	− 2436	−102.6	× 28 / 141	−20.4
4	59,309	2335.2	− 2485	−149.8	× 38 / 141	−40.4
5	59,310	2371.0	− 2528	−157	× 39 / 141	−43.4
6	59,311	2368.6	− 2552	−183.4	× 36 / 141	−46.8
Sum, rounded to a whole point						−151

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	59,266	2364.3	− 2436	−71.7	× 33 / 138	−17.1
4	59,267	2373.2	− 2485	−111.8	× 29 / 138	−23.5
5	59,268	2348.3	− 2528	−179.7	× 36 / 138	−46.9
6	59,269	2405.5	− 2552	−146.5	× 40 / 138	−42.5
Sum, rounded to a whole point						−130

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	59,197	2331.8	− 2436	−104.2	× 30 / 112	−27.9
4	59,198	2368.1	− 2485	−116.9	× 28 / 112	−29.2
5	59,199	2386.4	− 2528	−141.6	× 22 / 112	−27.8
6	59,200	2393.8	− 2552	−158.2	× 32 / 112	−45.2
Sum, rounded to a whole point						−130

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,954	2317.0	− 2436	−119	× 36 / 118	−36.3
4	58,955	2392.9	− 2485	−92.1	× 29 / 118	−22.6
5	58,956	2392.7	− 2528	−135.3	× 26 / 118	−29.8
6	58,957	2410.4	− 2552	−141.6	× 27 / 118	−32.4
Sum, rounded to a whole point						−121

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −107, −109, −128, −116, −95, −151, −130, −130, −121 → −120.8
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: 19 · 2017→2018: 12 · 2018→2019: 21 · 2019→2022: 56 · 2022→2023: 21 · 2023→2024: 0 · 2024→2025: 9 → average 17.5
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 17.5 × 2.66 = 46.6. Upper limit −74.2, lower limit −167.4.

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.