Center Middle: 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 4 bar

The state's math test uses one scale for every grade, so a score means the same thing in grade 3 as in grade 8.

7th The average 7th grader scores 34 points under the grade 4 bar. 2451 vs. 2485. The 7th-grade bar is 2567.
8th The average 8th grader scores just under the grade 4 bar. 2478 vs. 2485. The 8th-grade bar is 2586.

2023 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	20,908	2449.1	− 2552	−102.9	× 173 / 555	−32.1
7	20,909	2463.7	− 2567	−103.3	× 179 / 555	−33.3
8	20,912	2503.0	− 2586	−83	× 203 / 555	−30.4
Sum, rounded to a whole point						−96

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	19,850	2436.9	− 2552	−115.1	× 156 / 496	−36.2
7	19,853	2470.4	− 2567	−96.6	× 163 / 496	−31.7
8	19,855	2503.2	− 2586	−82.8	× 177 / 496	−29.5
Sum, rounded to a whole point						−97

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	20,162	2444.9	− 2552	−107.1	× 148 / 454	−34.9
7	20,165	2489.6	− 2567	−77.4	× 154 / 454	−26.3
8	20,167	2497.2	− 2586	−88.8	× 152 / 454	−29.7
Sum, rounded to a whole point						−91

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	20,164	2457.3	− 2552	−94.7	× 143 / 426	−31.8
7	20,166	2488.3	− 2567	−78.7	× 131 / 426	−24.2
8	20,168	2519.4	− 2586	−66.6	× 152 / 426	−23.8
Sum, rounded to a whole point						−80

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	20,341	2451.8	− 2552	−100.2	× 149 / 432	−34.6
7	20,342	2478.0	− 2567	−89	× 146 / 432	−30.1
8	20,343	2512.6	− 2586	−73.4	× 137 / 432	−23.3
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
7	20,373	2456.5	− 2567	−110.5	× 126 / 263	−52.9
8	20,374	2474.1	− 2586	−111.9	× 137 / 263	−58.3
Sum, rounded to a whole point						−111

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
7	20,344	2450.8	− 2567	−116.2	× 131 / 261	−58.3
8	20,345	2478.0	− 2586	−108	× 130 / 261	−53.8
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. −96, −97, −91, −80, −88, −111, −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: 1 · 2016→2017: 6 · 2017→2018: 11 · 2018→2019: 8 · 2019→2022: 23 · 2022→2023: 1 → average 8.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 8.3 × 2.66 = 22.1. Upper limit −74.3, lower limit −118.5.

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.