Harvest Ridge Cooperative Charter: 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	54,077	2458.8	− 2436	22.8	× 35 / 188	4.2
4	54,078	2477.8	− 2485	−7.2	× 34 / 188	−1.3
5	54,081	2519.4	− 2528	−8.6	× 39 / 188	−1.8
6	54,083	2549.4	− 2552	−2.6	× 35 / 188	−0.5
7	54,084	2576.6	− 2567	9.6	× 26 / 188	1.3
8	54,087	2574.9	− 2586	−11.1	× 19 / 188	−1.1
Sum, rounded to a whole point						1

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	50,245	2439.9	− 2436	3.9	× 63 / 214	1.1
4	50,247	2489.6	− 2485	4.6	× 33 / 214	0.7
5	50,249	2523.7	− 2528	−4.3	× 31 / 214	−0.6
6	50,251	2563.7	− 2552	11.7	× 34 / 214	1.9
7	50,253	2591.7	− 2567	24.7	× 34 / 214	3.9
8	50,256	2629.6	− 2586	43.6	× 19 / 214	3.9
Sum, rounded to a whole point						11

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	51,668	2464.1	− 2436	28.1	× 60 / 280	6
4	51,669	2492.1	− 2485	7.1	× 60 / 280	1.5
5	51,671	2516.0	− 2528	−12	× 49 / 280	−2.1
6	51,673	2542.7	− 2552	−9.3	× 37 / 280	−1.2
7	51,676	2577.4	− 2567	10.4	× 41 / 280	1.5
8	51,677	2591.0	− 2586	5	× 33 / 280	0.6
Sum, rounded to a whole point						6

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	51,697	2458.0	− 2436	22	× 62 / 297	4.6
4	51,700	2494.5	− 2485	9.5	× 65 / 297	2.1
5	51,701	2541.1	− 2528	13.1	× 57 / 297	2.5
6	51,704	2545.4	− 2552	−6.6	× 46 / 297	−1
7	51,705	2554.5	− 2567	−12.5	× 31 / 297	−1.3
8	51,707	2574.1	− 2586	−11.9	× 36 / 297	−1.4
Sum, rounded to a whole point						5

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	51,899	2472.3	− 2436	36.3	× 19 / 105	6.6
4	51,900	2498.4	− 2485	13.4	× 18 / 105	2.3
5	51,901	2509.1	− 2528	−18.9	× 18 / 105	−3.2
6	51,902	2543.3	− 2552	−8.7	× 17 / 105	−1.4
7	51,903	2547.9	− 2567	−19.1	× 17 / 105	−3.1
8	51,904	2585.5	− 2586	−0.5	× 16 / 105	−0.1
Sum, rounded to a whole point						1

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	51,825	2448.5	− 2436	12.5	× 26 / 152	2.1
4	51,826	2434.9	− 2485	−50.1	× 28 / 152	−9.2
5	51,827	2480.4	− 2528	−47.6	× 27 / 152	−8.5
6	51,828	2543.3	− 2552	−8.7	× 26 / 152	−1.5
7	51,829	2548.9	− 2567	−18.1	× 25 / 152	−3
8	51,830	2540.0	− 2586	−46	× 20 / 152	−6.1
Sum, rounded to a whole point						−26

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	51,792	2432.2	− 2436	−3.8	× 36 / 176	−0.8
4	51,793	2489.5	− 2485	4.5	× 31 / 176	0.8
5	51,794	2488.1	− 2528	−39.9	× 29 / 176	−6.6
6	51,795	2507.2	− 2552	−44.8	× 28 / 176	−7.1
7	51,796	2589.3	− 2567	22.3	× 25 / 176	3.2
8	51,797	2554.4	− 2586	−31.6	× 27 / 176	−4.8
Sum, rounded to a whole point						−15

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	51,610	2427.6	− 2436	−8.4	× 37 / 182	−1.7
4	51,611	2452.6	− 2485	−32.4	× 39 / 182	−6.9
5	51,612	2505.8	− 2528	−22.2	× 30 / 182	−3.7
6	51,613	2489.6	− 2552	−62.4	× 28 / 182	−9.6
7	51,614	2535.3	− 2567	−31.7	× 28 / 182	−4.9
8	51,615	2608.1	− 2586	22.1	× 20 / 182	2.4
Sum, rounded to a whole point						−24

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	51,392	2435.0	− 2436	−1	× 37 / 201	−0.2
4	51,393	2474.8	− 2485	−10.2	× 35 / 201	−1.8
5	51,394	2474.4	− 2528	−53.6	× 46 / 201	−12.3
6	51,395	2521.3	− 2552	−30.7	× 29 / 201	−4.4
7	51,396	2527.7	− 2567	−39.3	× 32 / 201	−6.3
8	51,397	2566.6	− 2586	−19.4	× 22 / 201	−2.1
Sum, rounded to a whole point						−27

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. 1, 11, 6, 5, 1, −26, −15, −24, −27 → −7.6
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 10 · 2016→2017: 5 · 2017→2018: 1 · 2018→2019: 4 · 2019→2022: 27 · 2022→2023: 11 · 2023→2024: 9 · 2024→2025: 3 → average 8.8
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 8.8 × 2.66 = 23.4. Upper limit 15.8, lower limit −31.

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.