Driffill 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.

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	103,480	2372.4	− 2436	−63.6	× 145 / 790	−11.7
4	103,481	2401.5	− 2485	−83.5	× 129 / 790	−13.6
5	103,484	2437.4	− 2528	−90.6	× 149 / 790	−17.1
6	103,485	2441.6	− 2552	−110.4	× 132 / 790	−18.4
7	103,488	2454.6	− 2567	−112.4	× 111 / 790	−15.8
8	103,489	2424.6	− 2586	−161.4	× 124 / 790	−25.3
Sum, rounded to a whole point						−102

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	96,166	2385.2	− 2436	−50.8	× 161 / 779	−10.5
4	96,167	2420.5	− 2485	−64.5	× 139 / 779	−11.5
5	96,169	2436.6	− 2528	−91.4	× 130 / 779	−15.3
6	96,172	2421.0	− 2552	−131	× 137 / 779	−23
7	96,174	2433.8	− 2567	−133.2	× 113 / 779	−19.3
8	96,176	2459.6	− 2586	−126.4	× 99 / 779	−16.1
Sum, rounded to a whole point						−96

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	98,953	2383.1	− 2436	−52.9	× 115 / 752	−8.1
4	98,954	2414.8	− 2485	−70.2	× 148 / 752	−13.8
5	98,956	2438.2	− 2528	−89.8	× 137 / 752	−16.4
6	98,958	2439.5	− 2552	−112.5	× 127 / 752	−19
7	98,960	2450.5	− 2567	−116.5	× 119 / 752	−18.4
8	98,963	2440.0	− 2586	−146	× 106 / 752	−20.6
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
3	99,108	2388.4	− 2436	−47.6	× 106 / 764	−6.6
4	99,110	2411.9	− 2485	−73.1	× 128 / 764	−12.2
5	99,112	2445.5	− 2528	−82.5	× 138 / 764	−14.9
6	99,114	2443.2	− 2552	−108.8	× 135 / 764	−19.2
7	99,116	2458.6	− 2567	−108.4	× 134 / 764	−19
8	99,118	2452.6	− 2586	−133.4	× 123 / 764	−21.5
Sum, rounded to a whole point						−93

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	99,777	2396.1	− 2436	−39.9	× 117 / 752	−6.2
4	99,778	2425.1	− 2485	−59.9	× 114 / 752	−9.1
5	99,779	2451.7	− 2528	−76.3	× 123 / 752	−12.5
6	99,780	2468.6	− 2552	−83.4	× 133 / 752	−14.8
7	99,781	2472.3	− 2567	−94.7	× 133 / 752	−16.7
8	99,782	2467.3	− 2586	−118.7	× 132 / 752	−20.8
Sum, rounded to a whole point						−80

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	99,976	2397.5	− 2436	−38.5	× 105 / 666	−6.1
4	99,977	2418.2	− 2485	−66.8	× 107 / 666	−10.7
5	99,978	2435.2	− 2528	−92.8	× 102 / 666	−14.2
6	99,979	2424.0	− 2552	−128	× 120 / 666	−23.1
7	99,980	2452.1	− 2567	−114.9	× 117 / 666	−20.2
8	99,981	2446.5	− 2586	−139.5	× 115 / 666	−24.1
Sum, rounded to a whole point						−98

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	99,818	2428.4	− 2436	−7.6	× 93 / 639	−1.1
4	99,819	2413.1	− 2485	−71.9	× 99 / 639	−11.1
5	99,820	2454.0	− 2528	−74	× 103 / 639	−11.9
6	99,821	2439.8	− 2552	−112.2	× 106 / 639	−18.6
7	99,822	2446.6	− 2567	−120.4	× 116 / 639	−21.9
8	99,823	2471.4	− 2586	−114.6	× 122 / 639	−21.9
Sum, rounded to a whole point						−87

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	99,697	2416.5	− 2436	−19.5	× 90 / 616	−2.8
4	99,698	2425.1	− 2485	−59.9	× 97 / 616	−9.4
5	99,699	2442.4	− 2528	−85.6	× 95 / 616	−13.2
6	99,700	2457.2	− 2552	−94.8	× 108 / 616	−16.6
7	99,701	2462.4	− 2567	−104.6	× 107 / 616	−18.2
8	99,702	2479.9	− 2586	−106.1	× 119 / 616	−20.5
Sum, rounded to a whole point						−81

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	99,403	2383.5	− 2436	−52.5	× 89 / 575	−8.1
4	99,404	2445.6	− 2485	−39.4	× 83 / 575	−5.7
5	99,405	2443.5	− 2528	−84.5	× 96 / 575	−14.1
6	99,406	2432.9	− 2552	−119.1	× 98 / 575	−20.3
7	99,407	2469.8	− 2567	−97.2	× 99 / 575	−16.7
8	99,408	2477.1	− 2586	−108.9	× 110 / 575	−20.8
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. −102, −96, −96, −93, −80, −98, −87, −81, −86 → −91
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 6 · 2016→2017: 0 · 2017→2018: 3 · 2018→2019: 13 · 2019→2022: 18 · 2022→2023: 11 · 2023→2024: 6 · 2024→2025: 5 → average 7.8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 7.8 × 2.66 = 20.7. Upper limit −70.3, lower limit −111.7.

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.