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	61,132	2372.0	− 2432	−60	× 22 / 89	−14.8
4	61,134	2425.7	− 2473	−47.3	× 22 / 89	−11.7
5	61,136	2442.0	− 2502	−60	× 22 / 89	−14.8
6	61,138	2542.7	− 2531	11.7	× 23 / 89	3
Sum, rounded to a whole point						−38

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	56,718	2412.3	− 2432	−19.7	× 23 / 80	−5.7
4	56,719	2474.1	− 2473	1.1	× 18 / 80	0.2
5	56,721	2486.8	− 2502	−15.2	× 21 / 80	−4
6	56,724	2489.1	− 2531	−41.9	× 18 / 80	−9.4
Sum, rounded to a whole point						−19

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,366	2393.7	− 2432	−38.3	× 19 / 73	−10
4	58,368	2462.0	− 2473	−11	× 21 / 73	−3.2
5	58,371	2436.8	− 2502	−65.2	× 16 / 73	−14.3
6	58,373	2499.9	− 2531	−31.1	× 17 / 73	−7.2
Sum, rounded to a whole point						−35

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,495	2435.3	− 2432	3.3	× 24 / 81	1
4	58,497	2474.7	− 2473	1.7	× 18 / 81	0.4
5	58,499	2474.0	− 2502	−28	× 22 / 81	−7.6
6	58,501	2534.9	− 2531	3.9	× 17 / 81	0.8
Sum, rounded to a whole point						−5

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,736	2432.6	− 2432	0.6	× 24 / 92	0.2
4	58,737	2494.4	− 2473	21.4	× 25 / 92	5.8
5	58,738	2499.8	− 2502	−2.2	× 21 / 92	−0.5
6	58,739	2547.3	− 2531	16.3	× 22 / 92	3.9
Sum, rounded to a whole point						9

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,809	2368.0	− 2432	−64	× 17 / 93	−11.7
4	58,810	2448.0	− 2473	−25	× 23 / 93	−6.2
5	58,811	2468.9	− 2502	−33.1	× 27 / 93	−9.6
6	58,812	2474.2	− 2531	−56.8	× 26 / 93	−15.9
Sum, rounded to a whole point						−43

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,763	2325.8	− 2432	−106.2	× 25 / 88	−30.2
4	58,764	2475.3	− 2473	2.3	× 16 / 88	0.4
5	58,765	2428.3	− 2502	−73.7	× 21 / 88	−17.6
6	58,766	2502.6	− 2531	−28.4	× 26 / 88	−8.4
Sum, rounded to a whole point						−56

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,680	2357.7	− 2432	−74.3	× 22 / 81	−20.2
4	58,681	2426.0	− 2473	−47	× 19 / 81	−11
5	58,682	2444.7	− 2502	−57.3	× 19 / 81	−13.4
6	58,683	2477.8	− 2531	−53.2	× 21 / 81	−13.8
Sum, rounded to a whole point						−58

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	58,437	2426.3	− 2432	−5.7	× 15 / 68	−1.3
4	58,438	2411.8	− 2473	−61.2	× 17 / 68	−15.3
5	58,439	2430.3	− 2502	−71.7	× 18 / 68	−19
6	58,440	2469.6	− 2531	−61.4	× 18 / 68	−16.3
Sum, rounded to a whole point						−52

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −38, −19, −35, −5, 9, −43, −56, −58, −52 → −33
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 19 · 2016→2017: 16 · 2017→2018: 30 · 2018→2019: 14 · 2019→2022: 52 · 2022→2023: 13 · 2023→2024: 2 · 2024→2025: 6 → average 19
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 19 × 2.66 = 50.5. Upper limit 17.5, lower limit −83.5.

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.