Ravenswood City Elementary: math

The shaded band is this district'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	83,317	2368.6	− 2436	−67.4	× 392 / 2166	−12.2
4	83,318	2409.7	− 2485	−75.3	× 338 / 2166	−11.8
5	83,321	2434.7	− 2528	−93.3	× 370 / 2166	−15.9
6	83,322	2436.2	− 2552	−115.8	× 371 / 2166	−19.8
7	83,325	2460.9	− 2567	−106.1	× 335 / 2166	−16.4
8	83,326	2469.2	− 2586	−116.8	× 360 / 2166	−19.4
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
3	77,246	2377.1	− 2436	−58.9	× 387 / 2161	−10.5
4	77,249	2396.9	− 2485	−88.1	× 388 / 2161	−15.8
5	77,250	2423.4	− 2528	−104.6	× 346 / 2161	−16.7
6	77,252	2444.7	− 2552	−107.3	× 334 / 2161	−16.6
7	77,254	2446.1	− 2567	−120.9	× 357 / 2161	−20
8	77,256	2478.7	− 2586	−107.3	× 349 / 2161	−17.3
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
3	79,357	2380.6	− 2436	−55.4	× 350 / 2028	−9.6
4	79,360	2406.1	− 2485	−78.9	× 344 / 2028	−13.4
5	79,361	2417.2	− 2528	−110.8	× 358 / 2028	−19.6
6	79,364	2441.9	− 2552	−110.1	× 315 / 2028	−17.1
7	79,366	2459.1	− 2567	−107.9	× 317 / 2028	−16.9
8	79,367	2451.5	− 2586	−134.5	× 344 / 2028	−22.8
Sum, rounded to a whole point						−99

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	79,500	2390.6	− 2436	−45.4	× 293 / 1773	−7.5
4	79,502	2412.9	− 2485	−72.1	× 319 / 1773	−13
5	79,504	2426.7	− 2528	−101.3	× 317 / 1773	−18.1
6	79,506	2408.6	− 2552	−143.4	× 258 / 1773	−20.9
7	79,508	2444.2	− 2567	−122.8	× 284 / 1773	−19.7
8	79,511	2465.8	− 2586	−120.2	× 302 / 1773	−20.5
Sum, rounded to a whole point						−100

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	80,023	2384.3	− 2436	−51.7	× 281 / 1628	−8.9
4	80,024	2417.9	− 2485	−67.1	× 283 / 1628	−11.7
5	80,025	2414.2	− 2528	−113.8	× 294 / 1628	−20.6
6	80,026	2409.0	− 2552	−143	× 214 / 1628	−18.8
7	80,027	2419.8	− 2567	−147.2	× 252 / 1628	−22.8
8	80,028	2452.5	− 2586	−133.5	× 304 / 1628	−24.9
Sum, rounded to a whole point						−108

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	80,297	2337.4	− 2436	−98.6	× 156 / 999	−15.4
4	80,298	2388.5	− 2485	−96.5	× 142 / 999	−13.7
5	80,299	2385.7	− 2528	−142.3	× 187 / 999	−26.6
6	80,300	2404.6	− 2552	−147.4	× 179 / 999	−26.4
7	80,301	2429.4	− 2567	−137.6	× 160 / 999	−22
8	80,302	2427.3	− 2586	−158.7	× 175 / 999	−27.8
Sum, rounded to a whole point						−132

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	80,261	2297.6	− 2436	−138.4	× 128 / 936	−18.9
4	80,262	2382.6	− 2485	−102.4	× 160 / 936	−17.5
5	80,263	2377.9	− 2528	−150.1	× 156 / 936	−25
6	80,264	2403.0	− 2552	−149	× 160 / 936	−25.5
7	80,265	2417.7	− 2567	−149.3	× 169 / 936	−27
8	80,266	2426.3	− 2586	−159.7	× 163 / 936	−27.8
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
3	80,281	2322.2	− 2436	−113.8	× 172 / 934	−21
4	80,282	2385.2	− 2485	−99.8	× 142 / 934	−15.2
5	80,283	2386.2	− 2528	−141.8	× 166 / 934	−25.2
6	80,284	2379.1	− 2552	−172.9	× 150 / 934	−27.8
7	80,285	2411.5	− 2567	−155.5	× 146 / 934	−24.3
8	80,286	2426.2	− 2586	−159.8	× 158 / 934	−27
Sum, rounded to a whole point						−140

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	79,941	2344.5	− 2436	−91.5	× 145 / 925	−14.3
4	79,942	2372.4	− 2485	−112.6	× 171 / 925	−20.8
5	79,943	2382.4	− 2528	−145.6	× 153 / 925	−24.1
6	79,944	2387.1	− 2552	−164.9	× 148 / 925	−26.4
7	79,945	2413.3	− 2567	−153.7	× 162 / 925	−26.9
8	79,946	2442.5	− 2586	−143.5	× 146 / 925	−22.6
Sum, rounded to a whole point						−135

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −96, −97, −99, −100, −108, −132, −142, −140, −135 → −116.6
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: 2 · 2017→2018: 1 · 2018→2019: 8 · 2019→2022: 24 · 2022→2023: 10 · 2023→2024: 2 · 2024→2025: 5 → average 6.6
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 6.6 × 2.66 = 17.6. Upper limit −99, lower limit −134.2.

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 — for a district, the total across its schools. From 2014–15, 2015–16, 2016–17, 2017–18, 2018–19, 2020–21, 2021–22, 2022–23, 2023–24, 2024–25, 2025–26.