Walnut Grove 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	97,371	2374.1	− 2432	−57.9	× 81 / 444	−10.6
4	97,373	2423.3	− 2473	−49.7	× 75 / 444	−8.4
5	97,374	2438.7	− 2502	−63.3	× 93 / 444	−13.3
6	97,377	2474.2	− 2531	−56.8	× 69 / 444	−8.8
7	97,378	2509.3	− 2552	−42.7	× 63 / 444	−6.1
8	97,381	2507.9	− 2567	−59.1	× 63 / 444	−8.4
Sum, rounded to a whole point						−55

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	90,275	2383.5	− 2432	−48.5	× 83 / 489	−8.2
4	90,277	2423.6	− 2473	−49.4	× 91 / 489	−9.2
5	90,279	2459.7	− 2502	−42.3	× 80 / 489	−6.9
6	90,280	2462.0	− 2531	−69	× 106 / 489	−15
7	90,283	2496.4	− 2552	−55.6	× 71 / 489	−8.1
8	90,285	2504.3	− 2567	−62.7	× 58 / 489	−7.4
Sum, rounded to a whole point						−55

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	92,916	2348.1	− 2432	−83.9	× 80 / 522	−12.9
4	92,919	2408.1	− 2473	−64.9	× 92 / 522	−11.4
5	92,920	2439.1	− 2502	−62.9	× 93 / 522	−11.2
6	92,923	2484.3	− 2531	−46.7	× 91 / 522	−8.1
7	92,925	2475.7	− 2552	−76.3	× 98 / 522	−14.3
8	92,927	2520.7	− 2567	−46.3	× 68 / 522	−6
Sum, rounded to a whole point						−64

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	93,115	2386.5	− 2432	−45.5	× 74 / 538	−6.3
4	93,118	2413.6	− 2473	−59.4	× 84 / 538	−9.3
5	93,119	2457.1	− 2502	−44.9	× 92 / 538	−7.7
6	93,122	2487.6	− 2531	−43.4	× 104 / 538	−8.4
7	93,123	2489.5	− 2552	−62.5	× 90 / 538	−10.5
8	93,126	2512.0	− 2567	−55	× 94 / 538	−9.6
Sum, rounded to a whole point						−52

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	93,766	2393.1	− 2432	−38.9	× 76 / 514	−5.8
4	93,767	2442.8	− 2473	−30.2	× 75 / 514	−4.4
5	93,768	2455.0	− 2502	−47	× 81 / 514	−7.4
6	93,769	2492.9	− 2531	−38.1	× 95 / 514	−7
7	93,770	2487.4	− 2552	−64.6	× 100 / 514	−12.6
8	93,771	2517.5	− 2567	−49.5	× 87 / 514	−8.4
Sum, rounded to a whole point						−46

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	93,999	2385.6	− 2432	−46.4	× 80 / 309	−12
4	94,000	2406.3	− 2473	−66.7	× 74 / 309	−16
5	94,001	2440.4	− 2502	−61.6	× 74 / 309	−14.8
6	94,002	2496.5	− 2531	−34.5	× 81 / 309	−9
Sum, rounded to a whole point						−52

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	93,907	2379.8	− 2432	−52.2	× 71 / 314	−11.8
4	93,908	2401.4	− 2473	−71.6	× 92 / 314	−21
5	93,909	2432.5	− 2502	−69.5	× 72 / 314	−15.9
6	93,910	2496.0	− 2531	−35	× 79 / 314	−8.8
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	93,788	2364.5	− 2432	−67.5	× 93 / 381	−16.5
4	93,789	2391.4	− 2473	−81.6	× 107 / 381	−22.9
5	93,790	2420.4	− 2502	−81.6	× 103 / 381	−22.1
6	93,791	2475.0	− 2531	−56	× 78 / 381	−11.5
Sum, rounded to a whole point						−73

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	93,520	2372.6	− 2432	−59.4	× 95 / 409	−13.8
4	93,521	2392.4	− 2473	−80.6	× 99 / 409	−19.5
5	93,522	2445.2	− 2502	−56.8	× 107 / 409	−14.9
6	93,523	2481.4	− 2531	−49.6	× 108 / 409	−13.1
Sum, rounded to a whole point						−61

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −55, −55, −64, −52, −46, −52, −58, −73, −61 → −57.3
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: 9 · 2017→2018: 12 · 2018→2019: 6 · 2019→2022: 6 · 2022→2023: 6 · 2023→2024: 15 · 2024→2025: 12 → average 8.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 8.3 × 2.66 = 22.1. Upper limit −35.2, lower limit −79.4.

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.