Barton 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	67,956	2373.0	− 2436	−63	× 66 / 264	−15.8
4	67,959	2380.2	− 2485	−104.8	× 70 / 264	−27.8
5	67,960	2438.8	− 2528	−89.2	× 66 / 264	−22.3
6	67,963	2444.5	− 2552	−107.5	× 62 / 264	−25.2
Sum, rounded to a whole point						−91

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	62,965	2350.1	− 2436	−85.9	× 70 / 254	−23.7
4	62,968	2408.0	− 2485	−77	× 66 / 254	−20
5	62,969	2407.6	− 2528	−120.4	× 59 / 254	−28
6	62,972	2441.4	− 2552	−110.6	× 59 / 254	−25.7
Sum, rounded to a whole point						−97

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	64,754	2366.7	− 2436	−69.3	× 72 / 255	−19.6
4	64,756	2408.2	− 2485	−76.8	× 67 / 255	−20.2
5	64,757	2433.4	− 2528	−94.6	× 67 / 255	−24.9
6	64,760	2423.8	− 2552	−128.2	× 49 / 255	−24.6
Sum, rounded to a whole point						−89

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	64,844	2383.5	− 2436	−52.5	× 58 / 245	−12.4
4	64,846	2409.6	− 2485	−75.4	× 65 / 245	−20
5	64,848	2433.1	− 2528	−94.9	× 63 / 245	−24.4
6	64,850	2423.1	− 2552	−128.9	× 59 / 245	−31
Sum, rounded to a whole point						−88

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,213	2377.6	− 2436	−58.4	× 58 / 225	−15.1
4	65,214	2419.2	− 2485	−65.8	× 51 / 225	−14.9
5	65,215	2425.1	− 2528	−102.9	× 61 / 225	−27.9
6	65,216	2462.8	− 2552	−89.2	× 55 / 225	−21.8
Sum, rounded to a whole point						−80

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,304	2350.1	− 2436	−85.9	× 62 / 284	−18.8
4	65,305	2362.1	− 2485	−122.9	× 72 / 284	−31.2
5	65,306	2407.7	− 2528	−120.3	× 81 / 284	−34.3
6	65,307	2412.7	− 2552	−139.3	× 69 / 284	−33.8
Sum, rounded to a whole point						−118

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,309	2352.9	− 2436	−83.1	× 77 / 275	−23.3
4	65,310	2386.7	− 2485	−98.3	× 58 / 275	−20.7
5	65,311	2377.7	− 2528	−150.3	× 66 / 275	−36.1
6	65,312	2409.2	− 2552	−142.8	× 74 / 275	−38.4
Sum, rounded to a whole point						−118

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,277	2377.1	− 2436	−58.9	× 64 / 256	−14.7
4	65,278	2366.1	− 2485	−118.9	× 64 / 256	−29.7
5	65,279	2395.7	− 2528	−132.3	× 59 / 256	−30.5
6	65,280	2397.2	− 2552	−154.8	× 69 / 256	−41.7
Sum, rounded to a whole point						−117

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	65,037	2376.7	− 2436	−59.3	× 65 / 236	−16.3
4	65,038	2411.9	− 2485	−73.1	× 56 / 236	−17.3
5	65,039	2402.5	− 2528	−125.5	× 60 / 236	−31.9
6	65,040	2422.3	− 2552	−129.7	× 55 / 236	−30.2
Sum, rounded to a whole point						−96

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −91, −97, −89, −88, −80, −118, −118, −117, −96 → −99.3
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 6 · 2016→2017: 8 · 2017→2018: 1 · 2018→2019: 8 · 2019→2022: 38 · 2022→2023: 0 · 2023→2024: 1 · 2024→2025: 21 → average 10.4
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 10.4 × 2.66 = 27.7. Upper limit −71.6, lower limit −127.

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.