Plainfield Elementary: english

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	105,683	2412.5	− 2432	−19.5	× 44 / 174	−4.9
4	105,686	2430.5	− 2473	−42.5	× 36 / 174	−8.8
5	105,688	2492.2	− 2502	−9.8	× 47 / 174	−2.6
6	105,689	2537.8	− 2531	6.8	× 47 / 174	1.8
Sum, rounded to a whole point						−15

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	98,195	2392.4	− 2432	−39.6	× 43 / 190	−9
4	98,197	2473.3	− 2473	0.3	× 48 / 190	0.1
5	98,200	2487.4	− 2502	−14.6	× 45 / 190	−3.5
6	98,202	2540.3	− 2531	9.3	× 54 / 190	2.6
Sum, rounded to a whole point						−10

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,062	2385.5	− 2432	−46.5	× 52 / 218	−11.1
4	101,065	2412.2	− 2473	−60.8	× 56 / 218	−15.6
5	101,067	2474.7	− 2502	−27.3	× 59 / 218	−7.4
6	101,069	2535.4	− 2531	4.4	× 51 / 218	1
Sum, rounded to a whole point						−33

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,215	2435.9	− 2432	3.9	× 52 / 216	0.9
4	101,218	2419.7	− 2473	−53.3	× 57 / 216	−14.1
5	101,219	2443.7	− 2502	−58.3	× 58 / 216	−15.7
6	101,222	2566.3	− 2531	35.3	× 49 / 216	8
Sum, rounded to a whole point						−21

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,870	2429.9	− 2432	−2.1	× 41 / 198	−0.4
4	101,871	2472.3	− 2473	−0.7	× 49 / 198	−0.2
5	101,872	2455.8	− 2502	−46.2	× 55 / 198	−12.8
6	101,873	2510.2	− 2531	−20.8	× 53 / 198	−5.6
Sum, rounded to a whole point						−19

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	102,151	2429.7	− 2432	−2.3	× 41 / 167	−0.6
4	102,152	2475.7	− 2473	2.7	× 45 / 167	0.7
5	102,153	2507.5	− 2502	5.5	× 51 / 167	1.7
6	102,154	2543.6	− 2531	12.6	× 30 / 167	2.3
Sum, rounded to a whole point						4

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,965	2413.5	− 2432	−18.5	× 39 / 178	−4.1
4	101,966	2464.0	− 2473	−9	× 42 / 178	−2.1
5	101,967	2498.8	− 2502	−3.2	× 47 / 178	−0.8
6	101,968	2567.9	− 2531	36.9	× 50 / 178	10.4
Sum, rounded to a whole point						3

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,858	2406.1	− 2432	−25.9	× 34 / 165	−5.3
4	101,859	2430.5	− 2473	−42.5	× 40 / 165	−10.3
5	101,860	2477.5	− 2502	−24.5	× 39 / 165	−5.8
6	101,861	2561.7	− 2531	30.7	× 52 / 165	9.7
Sum, rounded to a whole point						−12

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,520	2426.2	− 2432	−5.8	× 23 / 133	−1
4	101,521	2468.6	− 2473	−4.4	× 36 / 133	−1.2
5	101,522	2462.5	− 2502	−39.5	× 33 / 133	−9.8
6	101,523	2522.7	− 2531	−8.3	× 41 / 133	−2.6
Sum, rounded to a whole point						−15

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −15, −10, −33, −21, −19, 4, 3, −12, −15 → −13.1
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 5 · 2016→2017: 23 · 2017→2018: 12 · 2018→2019: 2 · 2019→2022: 23 · 2022→2023: 1 · 2023→2024: 15 · 2024→2025: 3 → average 10.5
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 10.5 × 2.66 = 27.9. Upper limit 14.8, lower limit −41.

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.