Di Giorgio Elementary: math

The shaded band is this district'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	16,725	2357.6	− 2436	−78.4	× 25 / 143	−13.7
4	16,728	2412.1	− 2485	−72.9	× 26 / 143	−13.3
5	16,729	2413.7	− 2528	−114.3	× 23 / 143	−18.4
6	16,732	2443.0	− 2552	−109	× 24 / 143	−18.3
7	16,734	2477.9	− 2567	−89.1	× 25 / 143	−15.6
8	16,736	2474.6	− 2586	−111.4	× 20 / 143	−15.6
Sum, rounded to a whole point						−95

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	15,746	2352.9	− 2436	−83.1	× 17 / 139	−10.2
4	15,749	2402.1	− 2485	−82.9	× 30 / 139	−17.9
5	15,751	2460.5	− 2528	−67.5	× 25 / 139	−12.1
6	15,752	2435.5	− 2552	−116.5	× 21 / 139	−17.6
7	15,754	2472.9	− 2567	−94.1	× 23 / 139	−15.6
8	15,757	2483.3	− 2586	−102.7	× 23 / 139	−17
Sum, rounded to a whole point						−90

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	16,068	2364.6	− 2436	−71.4	× 28 / 149	−13.4
4	16,070	2392.8	− 2485	−92.2	× 18 / 149	−11.1
5	16,071	2420.7	− 2528	−107.3	× 32 / 149	−23
6	16,074	2490.8	− 2552	−61.2	× 24 / 149	−9.9
7	16,076	2464.5	− 2567	−102.5	× 22 / 149	−15.1
8	16,077	2444.4	− 2586	−141.6	× 25 / 149	−23.8
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	16,084	2381.9	− 2436	−54.1	× 24 / 149	−8.7
4	16,087	2411.5	− 2485	−73.5	× 31 / 149	−15.3
5	16,088	2418.5	− 2528	−109.5	× 19 / 149	−14
6	16,091	2468.1	− 2552	−83.9	× 32 / 149	−18
7	16,092	2498.6	− 2567	−68.4	× 23 / 149	−10.6
8	16,095	2419.7	− 2586	−166.3	× 20 / 149	−22.3
Sum, rounded to a whole point						−89

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	16,219	2402.4	− 2436	−33.6	× 24 / 148	−5.4
4	16,220	2385.9	− 2485	−99.1	× 23 / 148	−15.4
5	16,221	2438.5	− 2528	−89.5	× 28 / 148	−16.9
6	16,222	2437.3	− 2552	−114.7	× 18 / 148	−14
7	16,223	2468.6	− 2567	−98.4	× 32 / 148	−21.3
8	16,224	2491.5	− 2586	−94.5	× 23 / 148	−14.7
Sum, rounded to a whole point						−88

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	16,261	2350.3	− 2436	−85.7	× 25 / 136	−15.8
4	16,262	2388.5	− 2485	−96.5	× 15 / 136	−10.6
5	16,263	2424.4	− 2528	−103.6	× 21 / 136	−16
6	16,264	2497.1	− 2552	−54.9	× 26 / 136	−10.5
7	16,265	2446.8	− 2567	−120.2	× 23 / 136	−20.3
8	16,266	2451.3	− 2586	−134.7	× 26 / 136	−25.8
Sum, rounded to a whole point						−99

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	16,199	2357.2	− 2436	−78.8	× 29 / 152	−15
4	16,200	2397.6	− 2485	−87.4	× 28 / 152	−16.1
5	16,201	2365.1	− 2528	−162.9	× 17 / 152	−18.2
6	16,202	2449.7	− 2552	−102.3	× 23 / 152	−15.5
7	16,203	2506.4	− 2567	−60.6	× 29 / 152	−11.6
8	16,204	2447.1	− 2586	−138.9	× 26 / 152	−23.8
Sum, rounded to a whole point						−100

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	16,144	2363.8	− 2436	−72.2	× 23 / 153	−10.9
4	16,145	2364.0	− 2485	−121	× 28 / 153	−22.1
5	16,146	2415.5	− 2528	−112.5	× 29 / 153	−21.3
6	16,147	2427.7	− 2552	−124.3	× 16 / 153	−13
7	16,148	2489.7	− 2567	−77.3	× 27 / 153	−13.6
8	16,149	2496.1	− 2586	−89.9	× 30 / 153	−17.6
Sum, rounded to a whole point						−99

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	16,131	2345.8	− 2436	−90.2	× 31 / 156	−17.9
4	16,132	2379.4	− 2485	−105.6	× 25 / 156	−16.9
5	16,133	2369.3	− 2528	−158.7	× 27 / 156	−27.5
6	16,134	2436.1	− 2552	−115.9	× 30 / 156	−22.3
7	16,135	2413.7	− 2567	−153.3	× 19 / 156	−18.7
8	16,136	2532.3	− 2586	−53.7	× 24 / 156	−8.3
Sum, rounded to a whole point						−112

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −95, −90, −96, −89, −88, −99, −100, −99, −112 → −96.4
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 5 · 2016→2017: 6 · 2017→2018: 7 · 2018→2019: 1 · 2019→2022: 11 · 2022→2023: 1 · 2023→2024: 1 · 2024→2025: 13 → average 5.6
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 5.6 × 2.66 = 14.9. Upper limit −81.5, lower limit −111.3.

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 — for a district, the total across its schools. From 2014–15, 2015–16, 2016–17, 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.

Schools in Di Giorgio Elementary

Di Giorgio Elementary