Robert L. Stevens Elementary: 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	95,854	2404.0	− 2436	−32	× 84 / 321	−8.4
4	95,857	2476.9	− 2485	−8.1	× 78 / 321	−2
5	95,858	2474.0	− 2528	−54	× 87 / 321	−14.6
6	95,861	2520.9	− 2552	−31.1	× 72 / 321	−7
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
3	88,956	2435.6	− 2436	−0.4	× 72 / 314	−0.1
4	88,957	2489.0	− 2485	4	× 85 / 314	1.1
5	88,960	2492.0	− 2528	−36	× 75 / 314	−8.6
6	88,962	2536.8	− 2552	−15.2	× 82 / 314	−4
Sum, rounded to a whole point						−12

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,513	2412.3	− 2436	−23.7	× 63 / 289	−5.2
4	91,514	2496.3	− 2485	11.3	× 72 / 289	2.8
5	91,516	2483.9	− 2528	−44.1	× 81 / 289	−12.4
6	91,519	2538.9	− 2552	−13.1	× 73 / 289	−3.3
Sum, rounded to a whole point						−18

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	91,711	2448.8	− 2436	12.8	× 67 / 280	3.1
4	91,713	2476.5	− 2485	−8.5	× 67 / 280	−2
5	91,716	2483.3	− 2528	−44.7	× 71 / 280	−11.3
6	91,717	2545.2	− 2552	−6.8	× 75 / 280	−1.8
Sum, rounded to a whole point						−12

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	92,356	2434.1	− 2436	−1.9	× 88 / 298	−0.6
4	92,357	2512.0	− 2485	27	× 67 / 298	6.1
5	92,358	2486.6	− 2528	−41.4	× 69 / 298	−9.6
6	92,359	2528.3	− 2552	−23.7	× 74 / 298	−5.9
Sum, rounded to a whole point						−10

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	92,614	2419.5	− 2436	−16.5	× 65 / 269	−4
4	92,615	2471.8	− 2485	−13.2	× 60 / 269	−2.9
5	92,616	2461.4	− 2528	−66.6	× 66 / 269	−16.3
6	92,617	2525.9	− 2552	−26.1	× 78 / 269	−7.6
Sum, rounded to a whole point						−31

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	92,520	2413.5	− 2436	−22.5	× 60 / 252	−5.4
4	92,521	2495.0	− 2485	10	× 64 / 252	2.5
5	92,522	2484.7	− 2528	−43.3	× 60 / 252	−10.3
6	92,523	2523.6	− 2552	−28.4	× 68 / 252	−7.7
Sum, rounded to a whole point						−21

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	92,415	2452.4	− 2436	16.4	× 57 / 246	3.8
4	92,416	2468.1	− 2485	−16.9	× 57 / 246	−3.9
5	92,417	2488.2	− 2528	−39.8	× 68 / 246	−11
6	92,418	2532.4	− 2552	−19.6	× 64 / 246	−5.1
Sum, rounded to a whole point						−16

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	92,139	2448.8	− 2436	12.8	× 65 / 232	3.6
4	92,140	2505.4	− 2485	20.4	× 50 / 232	4.4
5	92,141	2470.3	− 2528	−57.7	× 55 / 232	−13.7
6	92,142	2536.9	− 2552	−15.1	× 62 / 232	−4
Sum, rounded to a whole point						−10

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −32, −12, −18, −12, −10, −31, −21, −16, −10 → −18
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: 6 · 2017→2018: 6 · 2018→2019: 2 · 2019→2022: 21 · 2022→2023: 10 · 2023→2024: 5 · 2024→2025: 6 → average 9.5
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 9.5 × 2.66 = 25.3. Upper limit 7.3, lower limit −43.3.

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. From 2014–15, 2015–16, 2016–17, 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.