Studio: english · Schoolio

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 bars

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

6th The average 6th grader scores just under the grade 5 bar. 2495 vs. 2502. The 6th-grade bar is 2531.
7th The average 7th grader scores 10 points under the grade 6 bar. 2521 vs. 2531. The 7th-grade bar is 2552.
8th The average 8th grader scores 15 points under the grade 8 bar. 2552 vs. 2567.

2019 results. The English test covers reading, writing, listening and research together. "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	28,557	2485.2	− 2531	−45.8	× 71 / 146	−22.3
7	28,559	2532.9	− 2552	−19.1	× 75 / 146	−9.8
Sum, rounded to a whole point						−32

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	26,632	2502.6	− 2531	−28.4	× 82 / 259	−9
7	26,633	2530.6	− 2552	−21.4	× 93 / 259	−7.7
8	26,636	2578.2	− 2567	11.2	× 84 / 259	3.6
Sum, rounded to a whole point						−13

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	27,122	2491.5	− 2531	−39.5	× 95 / 280	−13.4
7	27,125	2531.2	− 2552	−20.8	× 98 / 280	−7.3
8	27,127	2564.0	− 2567	−3	× 87 / 280	−0.9
Sum, rounded to a whole point						−22

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	27,084	2497.1	− 2531	−33.9	× 75 / 280	−9.1
7	27,086	2533.7	− 2552	−18.3	× 94 / 280	−6.1
8	27,088	2558.9	− 2567	−8.1	× 111 / 280	−3.2
Sum, rounded to a whole point						−18

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	27,205	2494.6	− 2531	−36.4	× 61 / 227	−9.8
7	27,206	2521.3	− 2552	−30.7	× 79 / 227	−10.7
8	27,207	2552.0	− 2567	−15	× 87 / 227	−5.7
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. −32, −13, −22, −18, −26 → −22.2
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 19 · 2016→2017: 9 · 2017→2018: 4 · 2018→2019: 8 → average 10
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 10 × 2.66 = 26.6. Upper limit 4.4, lower limit −48.8.

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".

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.