Del Rio 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	17,822	2424.3	− 2432	−7.7	× 67 / 231	−2.2
4	17,824	2440.7	− 2473	−32.3	× 45 / 231	−6.3
5	17,826	2498.4	− 2502	−3.6	× 58 / 231	−0.9
6	17,828	2502.3	− 2531	−28.7	× 61 / 231	−7.6
Sum, rounded to a whole point						−17

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	16,830	2448.7	− 2432	16.7	× 50 / 210	4
4	16,832	2478.2	− 2473	5.2	× 60 / 210	1.5
5	16,834	2511.8	− 2502	9.8	× 47 / 210	2.2
6	16,836	2553.3	− 2531	22.3	× 53 / 210	5.6
Sum, rounded to a whole point						13

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	17,151	2429.3	− 2432	−2.7	× 47 / 213	−0.6
4	17,153	2513.0	− 2473	40	× 55 / 213	10.3
5	17,156	2516.8	− 2502	14.8	× 60 / 213	4.2
6	17,157	2538.9	− 2531	7.9	× 51 / 213	1.9
Sum, rounded to a whole point						16

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	17,174	2427.4	− 2432	−4.6	× 48 / 210	−1.1
4	17,177	2507.3	− 2473	34.3	× 46 / 210	7.5
5	17,178	2541.8	− 2502	39.8	× 57 / 210	10.8
6	17,181	2528.0	− 2531	−3	× 59 / 210	−0.8
Sum, rounded to a whole point						16

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	17,314	2420.0	− 2432	−12	× 73 / 237	−3.7
4	17,315	2492.5	− 2473	19.5	× 57 / 237	4.7
5	17,316	2538.8	− 2502	36.8	× 53 / 237	8.2
6	17,317	2554.9	− 2531	23.9	× 54 / 237	5.4
Sum, rounded to a whole point						15

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	17,366	2395.9	− 2432	−36.1	× 72 / 309	−8.4
4	17,367	2496.7	− 2473	23.7	× 87 / 309	6.7
5	17,368	2513.1	− 2502	11.1	× 68 / 309	2.4
6	17,369	2534.9	− 2531	3.9	× 82 / 309	1
Sum, rounded to a whole point						2

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	17,304	2421.9	− 2432	−10.1	× 78 / 317	−2.5
4	17,305	2475.3	− 2473	2.3	× 76 / 317	0.6
5	17,306	2518.6	− 2502	16.6	× 90 / 317	4.7
6	17,307	2534.6	− 2531	3.6	× 73 / 317	0.8
Sum, rounded to a whole point						4

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	17,259	2419.3	− 2432	−12.7	× 83 / 339	−3.1
4	17,260	2490.6	− 2473	17.6	× 80 / 339	4.2
5	17,261	2512.8	− 2502	10.8	× 79 / 339	2.5
6	17,262	2543.5	− 2531	12.5	× 97 / 339	3.6
Sum, rounded to a whole point						7

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	17,256	2411.5	− 2432	−20.5	× 79 / 320	−5.1
4	17,257	2497.3	− 2473	24.3	× 82 / 320	6.2
5	17,258	2535.5	− 2502	33.5	× 79 / 320	8.3
6	17,259	2546.2	− 2531	15.2	× 80 / 320	3.8
Sum, rounded to a whole point						13

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −17, 13, 16, 16, 15, 2, 4, 7, 13 → 7.7
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 30 · 2016→2017: 3 · 2017→2018: 0 · 2018→2019: 1 · 2019→2022: 13 · 2022→2023: 2 · 2023→2024: 3 · 2024→2025: 6 → average 7.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 7.3 × 2.66 = 19.4. Upper limit 27.1, lower limit −11.7.

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.