Del Valle 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 77 points under the grade 3 bar. 2359 vs. 2436.
4th The average 4th grader scores 43 points under the grade 4 bar. 2442 vs. 2485.
5th The average 5th grader scores 44 points under the grade 4 bar. 2441 vs. 2485. The 5th-grade bar is 2528.
6th The average 6th grader meets the grade 6 bar. 2595 vs. 2552.

2024 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	39,429	2381.4	− 2436	−54.6	× 63 / 254	−13.5
4	39,431	2453.0	− 2485	−32	× 50 / 254	−6.3
5	39,433	2441.6	− 2528	−86.4	× 69 / 254	−23.5
6	39,435	2499.8	− 2552	−52.2	× 72 / 254	−14.8
Sum, rounded to a whole point						−58

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	36,536	2423.6	− 2436	−12.4	× 53 / 247	−2.7
4	36,539	2411.4	− 2485	−73.6	× 62 / 247	−18.5
5	36,540	2483.5	− 2528	−44.5	× 51 / 247	−9.2
6	36,543	2532.9	− 2552	−19.1	× 81 / 247	−6.3
Sum, rounded to a whole point						−37

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	37,303	2421.7	− 2436	−14.3	× 48 / 234	−2.9
4	37,304	2452.2	− 2485	−32.8	× 60 / 234	−8.4
5	37,307	2456.1	− 2528	−71.9	× 69 / 234	−21.2
6	37,308	2539.6	− 2552	−12.4	× 57 / 234	−3
Sum, rounded to a whole point						−36

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	37,255	2418.6	− 2436	−17.4	× 39 / 221	−3.1
4	37,257	2457.6	− 2485	−27.4	× 49 / 221	−6.1
5	37,259	2497.8	− 2528	−30.2	× 51 / 221	−7
6	37,261	2491.9	− 2552	−60.1	× 82 / 221	−22.3
Sum, rounded to a whole point						−38

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	37,460	2417.0	− 2436	−19	× 52 / 208	−4.8
4	37,461	2484.3	− 2485	−0.7	× 42 / 208	−0.1
5	37,462	2481.5	− 2528	−46.5	× 51 / 208	−11.4
6	37,463	2523.8	− 2552	−28.2	× 63 / 208	−8.5
Sum, rounded to a whole point						−25

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	37,367	2352.5	− 2436	−83.5	× 38 / 157	−20.2
4	37,368	2460.0	− 2485	−25	× 31 / 157	−4.9
5	37,369	2463.1	− 2528	−64.9	× 38 / 157	−15.7
6	37,370	2450.5	− 2552	−101.5	× 50 / 157	−32.3
Sum, rounded to a whole point						−73

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	37,398	2383.0	− 2436	−53	× 33 / 139	−12.6
4	37,399	2404.4	− 2485	−80.6	× 33 / 139	−19.1
5	37,400	2457.4	− 2528	−70.6	× 32 / 139	−16.3
6	37,401	2518.2	− 2552	−33.8	× 41 / 139	−10
Sum, rounded to a whole point						−58

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	37,250	2359.2	− 2436	−76.8	× 29 / 123	−18.1
4	37,251	2442.3	− 2485	−42.7	× 28 / 123	−9.7
5	37,252	2441.0	− 2528	−87	× 34 / 123	−24
6	37,253	2594.6	− 2552	42.6	× 32 / 123	11.1
Sum, rounded to a whole point						−41

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −58, −37, −36, −38, −25, −73, −58, −41 → −45.8
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 21 · 2016→2017: 1 · 2017→2018: 2 · 2018→2019: 13 · 2019→2022: 48 · 2022→2023: 15 · 2023→2024: 17 → average 16.7
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 16.7 × 2.66 = 44.4. Upper limit −1.4, lower limit −90.2.

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.