Prestwood 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 5.

3rd The average 3rd grader scores 13 points under the grade 3 bar. 2423 vs. 2436.
4th The average 4th grader scores just under the grade 3 bar. 2430 vs. 2436. The 4th-grade bar is 2485.
5th The average 5th grader scores 14 points under the grade 4 bar. 2472 vs. 2485. The 5th-grade bar is 2528.

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	95,592	2402.4	− 2436	−33.6	× 82 / 238	−11.6
4	95,595	2452.7	− 2485	−32.3	× 78 / 238	−10.6
5	95,596	2492.4	− 2528	−35.6	× 78 / 238	−11.7
Sum, rounded to a whole point						−34

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	88,728	2418.8	− 2436	−17.2	× 72 / 242	−5.1
4	88,729	2457.0	− 2485	−28	× 82 / 242	−9.5
5	88,732	2494.7	− 2528	−33.3	× 88 / 242	−12.1
Sum, rounded to a whole point						−27

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,280	2426.8	− 2436	−9.2	× 62 / 213	−2.7
4	91,283	2469.9	− 2485	−15.1	× 74 / 213	−5.2
5	91,285	2477.8	− 2528	−50.2	× 77 / 213	−18.1
Sum, rounded to a whole point						−26

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,469	2423.5	− 2436	−12.5	× 61 / 206	−3.7
4	91,472	2454.6	− 2485	−30.4	× 71 / 206	−10.5
5	91,473	2502.2	− 2528	−25.8	× 74 / 206	−9.3
Sum, rounded to a whole point						−23

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	92,115	2449.3	− 2436	13.3	× 66 / 193	4.5
4	92,116	2442.0	− 2485	−43	× 63 / 193	−14
5	92,117	2498.5	− 2528	−29.5	× 64 / 193	−9.8
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	92,367	2438.8	− 2436	2.8	× 40 / 139	0.8
4	92,368	2441.4	− 2485	−43.6	× 45 / 139	−14.1
5	92,369	2471.9	− 2528	−56.1	× 54 / 139	−21.8
Sum, rounded to a whole point						−35

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	92,279	2416.6	− 2436	−19.4	× 36 / 120	−5.8
4	92,280	2468.2	− 2485	−16.8	× 39 / 120	−5.5
5	92,281	2472.9	− 2528	−55.1	× 45 / 120	−20.7
Sum, rounded to a whole point						−32

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	92,176	2417.4	− 2436	−18.6	× 40 / 118	−6.3
4	92,177	2448.4	− 2485	−36.6	× 40 / 118	−12.4
5	92,178	2495.3	− 2528	−32.7	× 38 / 118	−10.5
Sum, rounded to a whole point						−29

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,886	2433.0	− 2436	−3	× 53 / 137	−1.2
4	91,887	2447.3	− 2485	−37.7	× 43 / 137	−11.8
5	91,888	2451.6	− 2528	−76.4	× 41 / 137	−22.9
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	91,515	2423.3	− 2436	−12.7	× 33 / 121	−3.5
4	91,516	2430.4	− 2485	−54.6	× 47 / 121	−21.2
5	91,517	2471.5	− 2528	−56.5	× 41 / 121	−19.1
Sum, rounded to a whole point						−44

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −34, −27, −26, −23, −19, −35, −32, −29, −36, −44 → −30.5
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 7 · 2016→2017: 1 · 2017→2018: 3 · 2018→2019: 4 · 2019→2022: 16 · 2022→2023: 3 · 2023→2024: 3 · 2024→2025: 7 · 2025→2026: 8 → average 5.8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 5.8 × 2.66 = 15.4. Upper limit −15.1, lower limit −45.9.

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.