Castle Rock: math · 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.

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
7	8,557	2438.9	− 2567	−128.1	× 13 / 115	−14.5
8	8,558	2443.5	− 2586	−142.5	× 33 / 115	−40.9
11	8,561	2473.0	− 2628	−155	× 69 / 115	−93
Sum, rounded to a whole point						−148

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	7,660	2345.7	− 2436	−90.3	× 11 / 110	−9
5	7,664	2409.3	− 2528	−118.7	× 12 / 110	−12.9
7	7,668	2509.1	− 2567	−57.9	× 21 / 110	−11.1
8	7,670	2470.4	− 2586	−115.6	× 18 / 110	−18.9
11	7,673	2450.5	− 2628	−177.5	× 48 / 110	−77.5
Sum, rounded to a whole point						−129

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	7,908	2436.6	− 2528	−91.4	× 11 / 136	−7.4
6	7,911	2412.6	− 2552	−139.4	× 20 / 136	−20.5
7	7,913	2477.1	− 2567	−89.9	× 26 / 136	−17.2
8	7,914	2480.3	− 2586	−105.7	× 28 / 136	−21.8
11	7,917	2478.7	− 2628	−149.3	× 51 / 136	−56
Sum, rounded to a whole point						−123

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
6	7,929	2421.9	− 2552	−130.1	× 12 / 106	−14.7
7	7,930	2436.7	− 2567	−130.3	× 22 / 106	−27
8	7,933	2467.9	− 2586	−118.1	× 28 / 106	−31.2
11	7,934	2469.4	− 2628	−158.6	× 44 / 106	−65.8
Sum, rounded to a whole point						−139

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
7	7,968	2435.8	− 2567	−131.2	× 24 / 104	−30.3
8	7,969	2441.8	− 2586	−144.2	× 33 / 104	−45.8
11	7,970	2473.0	− 2628	−155	× 47 / 104	−70
Sum, rounded to a whole point						−146

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	7,885	2320.1	− 2436	−115.9	× 15 / 163	−10.7
4	7,886	2369.2	− 2485	−115.8	× 13 / 163	−9.2
5	7,887	2379.9	− 2528	−148.1	× 14 / 163	−12.7
6	7,888	2400.0	− 2552	−152	× 24 / 163	−22.4
7	7,889	2417.6	− 2567	−149.4	× 19 / 163	−17.4
8	7,890	2445.4	− 2586	−140.6	× 28 / 163	−24.2
11	7,891	2430.3	− 2628	−197.7	× 50 / 163	−60.6
Sum, rounded to a whole point						−157

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
4	7,870	2392.5	− 2485	−92.5	× 16 / 173	−8.6
5	7,871	2370.1	− 2528	−157.9	× 12 / 173	−11
6	7,872	2427.9	− 2552	−124.1	× 16 / 173	−11.5
7	7,873	2447.3	− 2567	−119.7	× 22 / 173	−15.2
8	7,874	2424.9	− 2586	−161.1	× 34 / 173	−31.7
11	7,875	2440.8	− 2628	−187.2	× 73 / 173	−79
Sum, rounded to a whole point						−157

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
4	7,814	2369.0	− 2485	−116	× 11 / 145	−8.8
5	7,815	2388.3	− 2528	−139.7	× 13 / 145	−12.5
6	7,816	2393.7	− 2552	−158.3	× 23 / 145	−25.1
7	7,817	2440.1	− 2567	−126.9	× 29 / 145	−25.4
8	7,818	2437.7	− 2586	−148.3	× 23 / 145	−23.5
11	7,819	2466.8	− 2628	−161.2	× 46 / 145	−51.1
Sum, rounded to a whole point						−146

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
5	7,772	2383.3	− 2528	−144.7	× 12 / 140	−12.4
6	7,773	2428.4	− 2552	−123.6	× 15 / 140	−13.2
7	7,774	2412.8	− 2567	−154.2	× 26 / 140	−28.6
8	7,775	2462.0	− 2586	−124	× 24 / 140	−21.3
11	7,776	2457.9	− 2628	−170.1	× 63 / 140	−76.5
Sum, rounded to a whole point						−152

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −148, −129, −123, −139, −146, −157, −157, −146, −152 → −144.1
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: 6 · 2017→2018: 16 · 2018→2019: 7 · 2019→2022: 11 · 2022→2023: 0 · 2023→2024: 11 · 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 −118.8, lower limit −169.4.

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.