Bret Harte Preparatory Middle: 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
6	32,923	2416.5	− 2531	−114.5	× 209 / 748	−32
7	32,926	2440.9	− 2552	−111.1	× 279 / 748	−41.4
8	32,928	2482.0	− 2567	−85	× 260 / 748	−29.5
Sum, rounded to a whole point						−103

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	31,138	2395.7	− 2531	−135.3	× 181 / 667	−36.7
7	31,139	2421.9	− 2552	−130.1	× 228 / 667	−44.5
8	31,141	2458.0	− 2567	−109	× 258 / 667	−42.2
Sum, rounded to a whole point						−123

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	31,698	2408.0	− 2531	−123	× 193 / 576	−41.2
7	31,700	2401.9	− 2552	−150.1	× 182 / 576	−47.4
8	31,703	2442.5	− 2567	−124.5	× 201 / 576	−43.4
Sum, rounded to a whole point						−132

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	31,744	2413.1	− 2531	−117.9	× 113 / 499	−26.7
7	31,746	2429.5	− 2552	−122.5	× 214 / 499	−52.5
8	31,748	2426.2	− 2567	−140.8	× 172 / 499	−48.5
Sum, rounded to a whole point						−128

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	31,917	2423.1	− 2531	−107.9	× 103 / 454	−24.5
7	31,918	2426.3	− 2552	−125.7	× 139 / 454	−38.5
8	31,919	2455.7	− 2567	−111.3	× 212 / 454	−52
Sum, rounded to a whole point						−115

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	31,944	2400.0	− 2531	−131	× 92 / 353	−34.1
7	31,945	2407.3	− 2552	−144.7	× 141 / 353	−57.8
8	31,946	2439.7	− 2567	−127.3	× 120 / 353	−43.3
Sum, rounded to a whole point						−135

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	32,001	2392.2	− 2531	−138.8	× 127 / 424	−41.6
7	32,002	2409.3	− 2552	−142.7	× 144 / 424	−48.5
8	32,003	2424.0	− 2567	−143	× 153 / 424	−51.6
Sum, rounded to a whole point						−142

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	31,867	2421.4	− 2531	−109.6	× 139 / 456	−33.4
7	31,868	2433.2	− 2552	−118.8	× 157 / 456	−40.9
8	31,869	2455.3	− 2567	−111.7	× 160 / 456	−39.2
Sum, rounded to a whole point						−114

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	31,726	2446.8	− 2531	−84.2	× 133 / 443	−25.3
7	31,727	2460.6	− 2552	−91.4	× 163 / 443	−33.6
8	31,728	2459.9	− 2567	−107.1	× 147 / 443	−35.5
Sum, rounded to a whole point						−94

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −103, −123, −132, −128, −115, −135, −142, −114, −94 → −120.7
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 20 · 2016→2017: 9 · 2017→2018: 4 · 2018→2019: 13 · 2019→2022: 20 · 2022→2023: 7 · 2023→2024: 28 · 2024→2025: 20 → average 15.1
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 15.1 × 2.66 = 40.2. Upper limit −80.5, lower limit −160.9.

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.