Harry Bridges Span: 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	28,475	2406.4	− 2436	−29.6	× 115 / 789	−4.3
4	28,477	2473.3	− 2485	−11.7	× 119 / 789	−1.8
5	28,479	2479.7	− 2528	−48.3	× 118 / 789	−7.2
6	28,481	2497.9	− 2552	−54.1	× 140 / 789	−9.6
7	28,483	2507.0	− 2567	−60	× 129 / 789	−9.8
8	28,485	2537.1	− 2586	−48.9	× 168 / 789	−10.4
Sum, rounded to a whole point						−43

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	26,558	2452.1	− 2436	16.1	× 137 / 785	2.8
4	26,560	2490.3	− 2485	5.3	× 118 / 785	0.8
5	26,562	2504.2	− 2528	−23.8	× 116 / 785	−3.5
6	26,564	2497.7	− 2552	−54.3	× 140 / 785	−9.7
7	26,566	2506.3	− 2567	−60.7	× 141 / 785	−10.9
8	26,568	2522.1	− 2586	−63.9	× 133 / 785	−10.8
Sum, rounded to a whole point						−31

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	27,043	2462.5	− 2436	26.5	× 118 / 768	4.1
4	27,045	2487.3	− 2485	2.3	× 139 / 768	0.4
5	27,046	2518.6	− 2528	−9.4	× 114 / 768	−1.4
6	27,048	2493.0	− 2552	−59	× 133 / 768	−10.2
7	27,050	2545.6	− 2567	−21.4	× 132 / 768	−3.7
8	27,052	2561.9	− 2586	−24.1	× 132 / 768	−4.1
Sum, rounded to a whole point						−15

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	27,003	2452.5	− 2436	16.5	× 123 / 788	2.6
4	27,006	2492.8	− 2485	7.8	× 125 / 788	1.2
5	27,007	2523.4	− 2528	−4.6	× 142 / 788	−0.8
6	27,010	2512.0	− 2552	−40	× 132 / 788	−6.7
7	27,011	2538.2	− 2567	−28.8	× 133 / 788	−4.9
8	27,014	2583.8	− 2586	−2.2	× 133 / 788	−0.4
Sum, rounded to a whole point						−9

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	27,132	2467.0	− 2436	31	× 143 / 789	5.6
4	27,133	2512.0	− 2485	27	× 126 / 789	4.3
5	27,134	2518.8	− 2528	−9.2	× 124 / 789	−1.4
6	27,135	2525.1	− 2552	−26.9	× 142 / 789	−4.8
7	27,136	2563.8	− 2567	−3.2	× 127 / 789	−0.5
8	27,137	2567.2	− 2586	−18.8	× 127 / 789	−3
Sum, rounded to a whole point						0

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	27,059	2435.0	− 2436	−1	× 116 / 751	−0.2
4	27,060	2482.5	− 2485	−2.5	× 125 / 751	−0.4
5	27,061	2479.0	− 2528	−49	× 110 / 751	−7.2
6	27,062	2479.3	− 2552	−72.7	× 147 / 751	−14.2
7	27,063	2514.4	− 2567	−52.6	× 127 / 751	−8.9
8	27,064	2517.3	− 2586	−68.7	× 126 / 751	−11.5
Sum, rounded to a whole point						−42

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	27,012	2420.2	− 2436	−15.8	× 127 / 780	−2.6
4	27,013	2466.0	− 2485	−19	× 123 / 780	−3
5	27,014	2475.9	− 2528	−52.1	× 129 / 780	−8.6
6	27,015	2481.9	− 2552	−70.1	× 130 / 780	−11.7
7	27,016	2529.0	− 2567	−38	× 145 / 780	−7.1
8	27,017	2545.6	− 2586	−40.4	× 126 / 780	−6.5
Sum, rounded to a whole point						−39

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	26,862	2437.3	− 2436	1.3	× 112 / 759	0.2
4	26,863	2474.0	− 2485	−11	× 117 / 759	−1.7
5	26,864	2459.3	− 2528	−68.7	× 126 / 759	−11.4
6	26,865	2497.2	− 2552	−54.8	× 145 / 759	−10.5
7	26,866	2536.3	− 2567	−30.7	× 118 / 759	−4.8
8	26,867	2560.0	− 2586	−26	× 141 / 759	−4.8
Sum, rounded to a whole point						−33

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	26,745	2423.8	− 2436	−12.2	× 130 / 755	−2.1
4	26,746	2476.0	− 2485	−9	× 109 / 755	−1.3
5	26,747	2482.9	− 2528	−45.1	× 115 / 755	−6.9
6	26,748	2498.6	− 2552	−53.4	× 139 / 755	−9.8
7	26,749	2544.8	− 2567	−22.2	× 142 / 755	−4.2
8	26,750	2574.6	− 2586	−11.4	× 120 / 755	−1.8
Sum, rounded to a whole point						−26

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −43, −31, −15, −9, 0, −42, −39, −33, −26 → −26.4
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 12 · 2016→2017: 16 · 2017→2018: 6 · 2018→2019: 9 · 2019→2022: 42 · 2022→2023: 3 · 2023→2024: 6 · 2024→2025: 7 → average 12.6
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 12.6 × 2.66 = 33.5. Upper limit 7.1, lower limit −59.9.

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.