Rancho Dominguez Preparatory: 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 11.

6th The average 6th grader scores 15 points under the grade 4 bar. 2470 vs. 2485. The 6th-grade bar is 2552.
7th The average 7th grader scores just under the grade 4 bar. 2482 vs. 2485. The 7th-grade bar is 2567.
8th The average 8th grader scores 34 points under the grade 5 bar. 2495 vs. 2528. The 8th-grade bar is 2586.
11th The average 11th grader scores 10 points under the grade 6 bar. 2542 vs. 2552. The 11th-grade bar is 2628.

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
6	28,188	2485.5	− 2552	−66.5	× 98 / 460	−14.2
7	28,189	2492.2	− 2567	−74.8	× 113 / 460	−18.4
8	28,192	2495.4	− 2586	−90.6	× 106 / 460	−20.9
11	28,193	2526.1	− 2628	−101.9	× 143 / 460	−31.7
Sum, rounded to a whole point						−85

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	26,252	2465.0	− 2552	−87	× 75 / 416	−15.7
7	26,254	2514.2	− 2567	−52.8	× 83 / 416	−10.5
8	26,256	2505.5	− 2586	−80.5	× 105 / 416	−20.3
11	26,257	2534.8	− 2628	−93.2	× 153 / 416	−34.3
Sum, rounded to a whole point						−81

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	26,734	2477.9	− 2552	−74.1	× 79 / 375	−15.6
7	26,736	2454.7	− 2567	−112.3	× 67 / 375	−20.1
8	26,739	2485.3	− 2586	−100.7	× 91 / 375	−24.4
11	26,741	2531.3	− 2628	−96.7	× 138 / 375	−35.6
Sum, rounded to a whole point						−96

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	26,705	2479.6	− 2552	−72.4	× 91 / 353	−18.7
7	26,707	2478.3	− 2567	−88.7	× 80 / 353	−20.1
8	26,709	2468.9	− 2586	−117.1	× 59 / 353	−19.6
11	26,711	2544.3	− 2628	−83.7	× 123 / 353	−29.2
Sum, rounded to a whole point						−88

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	26,830	2506.4	− 2552	−45.6	× 73 / 356	−9.4
7	26,831	2486.0	− 2567	−81	× 99 / 356	−22.5
8	26,832	2489.5	− 2586	−96.5	× 74 / 356	−20.1
11	26,833	2551.5	− 2628	−76.5	× 110 / 356	−23.6
Sum, rounded to a whole point						−76

2021 from sb_ca2021_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
11	26,030	2544.6	− 2628	−83.4	× 77 / 77	−83.4
Sum, rounded to a whole point						−83

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	26,767	2529.7	− 2552	−22.3	× 69 / 291	−5.3
7	26,768	2467.9	− 2567	−99.1	× 56 / 291	−19.1
8	26,769	2498.7	− 2586	−87.3	× 89 / 291	−26.7
11	26,770	2493.3	− 2628	−134.7	× 77 / 291	−35.6
Sum, rounded to a whole point						−87

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	26,720	2525.2	− 2552	−26.8	× 56 / 298	−5
7	26,721	2479.2	− 2567	−87.8	× 73 / 298	−21.5
8	26,722	2435.0	− 2586	−151	× 55 / 298	−27.9
11	26,723	2483.8	− 2628	−144.2	× 114 / 298	−55.2
Sum, rounded to a whole point						−110

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	26,570	2478.0	− 2552	−74	× 61 / 287	−15.7
7	26,571	2489.4	− 2567	−77.6	× 57 / 287	−15.4
8	26,572	2532.2	− 2586	−53.8	× 77 / 287	−14.4
11	26,573	2498.2	− 2628	−129.8	× 92 / 287	−41.6
Sum, rounded to a whole point						−87

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	26,457	2485.7	− 2552	−66.3	× 67 / 305	−14.6
7	26,458	2472.8	− 2567	−94.2	× 59 / 305	−18.2
8	26,459	2491.1	− 2586	−94.9	× 61 / 305	−19
11	26,460	2541.3	− 2628	−86.7	× 118 / 305	−33.5
Sum, rounded to a whole point						−85

2026 from sb_ca2026_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	26,469	2470.1	− 2552	−81.9	× 34 / 220	−12.7
7	26,470	2482.3	− 2567	−84.7	× 60 / 220	−23.1
8	26,471	2494.5	− 2586	−91.5	× 56 / 220	−23.3
11	26,472	2541.9	− 2628	−86.1	× 70 / 220	−27.4
Sum, rounded to a whole point						−86

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −85, −81, −96, −88, −76, −83, −87, −110, −87, −85, −86 → −87.6
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 4 · 2016→2017: 15 · 2017→2018: 8 · 2018→2019: 12 · 2019→2021: 7 · 2021→2022: 4 · 2022→2023: 23 · 2023→2024: 23 · 2024→2025: 2 · 2025→2026: 1 → average 9.9
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 9.9 × 2.66 = 26.3. Upper limit −61.3, lower limit −113.9.

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.