Plainfield 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.

Measured against the grade bars

The state's math test uses one scale for every grade, so a score means the same thing in grade 3 as in grade 6.

3rd The average 3rd grader scores 20 points under the grade 3 bar. 2416 vs. 2436.
4th The average 4th grader scores 21 points under the grade 4 bar. 2464 vs. 2485.
5th The average 5th grader scores just under the grade 4 bar. 2478 vs. 2485. The 5th-grade bar is 2528.
6th The average 6th grader scores 28 points under the grade 5 bar. 2501 vs. 2528. The 6th-grade bar is 2552.

2026 results. "Meets standard" is the state's mark for being on track for that grade.

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	105,684	2434.8	− 2436	−1.2	× 44 / 174	−0.3
4	105,685	2436.1	− 2485	−48.9	× 36 / 174	−10.1
5	105,687	2490.7	− 2528	−37.3	× 47 / 174	−10.1
6	105,690	2534.5	− 2552	−17.5	× 47 / 174	−4.7
Sum, rounded to a whole point						−25

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	98,196	2399.4	− 2436	−36.6	× 44 / 193	−8.3
4	98,198	2487.6	− 2485	2.6	× 49 / 193	0.7
5	98,199	2495.5	− 2528	−32.5	× 45 / 193	−7.6
6	98,201	2517.9	− 2552	−34.1	× 55 / 193	−9.7
Sum, rounded to a whole point						−25

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,063	2407.1	− 2436	−28.9	× 52 / 222	−6.8
4	101,064	2425.7	− 2485	−59.3	× 56 / 222	−15
5	101,066	2500.2	− 2528	−27.8	× 62 / 222	−7.8
6	101,068	2504.2	− 2552	−47.8	× 52 / 222	−11.2
Sum, rounded to a whole point						−41

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,216	2429.8	− 2436	−6.2	× 52 / 216	−1.5
4	101,217	2448.4	− 2485	−36.6	× 57 / 216	−9.7
5	101,220	2454.6	− 2528	−73.4	× 58 / 216	−19.7
6	101,221	2558.0	− 2552	6	× 49 / 216	1.4
Sum, rounded to a whole point						−29

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,875	2437.8	− 2436	1.8	× 41 / 201	0.4
4	101,876	2485.7	− 2485	0.7	× 50 / 201	0.2
5	101,877	2485.8	− 2528	−42.2	× 56 / 201	−11.8
6	101,878	2497.2	− 2552	−54.8	× 54 / 201	−14.7
Sum, rounded to a whole point						−26

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	102,156	2434.5	− 2436	−1.5	× 41 / 167	−0.4
4	102,157	2481.2	− 2485	−3.8	× 45 / 167	−1
5	102,158	2511.0	− 2528	−17	× 51 / 167	−5.2
6	102,159	2532.2	− 2552	−19.8	× 30 / 167	−3.6
Sum, rounded to a whole point						−10

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,970	2434.0	− 2436	−2	× 38 / 179	−0.4
4	101,971	2486.5	− 2485	1.5	× 42 / 179	0.4
5	101,972	2499.6	− 2528	−28.4	× 48 / 179	−7.6
6	101,973	2553.8	− 2552	1.8	× 51 / 179	0.5
Sum, rounded to a whole point						−7

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,863	2441.7	− 2436	5.7	× 35 / 166	1.2
4	101,864	2452.9	− 2485	−32.1	× 40 / 166	−7.7
5	101,865	2484.0	− 2528	−44	× 39 / 166	−10.3
6	101,866	2559.6	− 2552	7.6	× 52 / 166	2.4
Sum, rounded to a whole point						−14

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,525	2437.1	− 2436	1.1	× 23 / 135	0.2
4	101,526	2477.1	− 2485	−7.9	× 36 / 135	−2.1
5	101,527	2454.7	− 2528	−73.3	× 34 / 135	−18.5
6	101,528	2500.9	− 2552	−51.1	× 42 / 135	−15.9
Sum, rounded to a whole point						−36

2026 from sb_ca2026_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	101,182	2416.3	− 2436	−19.7	× 40 / 134	−5.9
4	101,183	2464.3	− 2485	−20.7	× 25 / 134	−3.9
5	101,184	2478.4	− 2528	−49.6	× 37 / 134	−13.7
6	101,185	2500.5	− 2552	−51.5	× 32 / 134	−12.3
Sum, rounded to a whole point						−36

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −25, −25, −41, −29, −26, −10, −7, −14, −36, −36 → −24.9
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 0 · 2016→2017: 16 · 2017→2018: 12 · 2018→2019: 3 · 2019→2022: 16 · 2022→2023: 3 · 2023→2024: 7 · 2024→2025: 22 · 2025→2026: 0 → average 8.8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 8.8 × 2.66 = 23.4. Upper limit −1.5, lower limit −48.3.

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.