Ladd Lane Elementary: english

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	63,803	2400.6	− 2432	−31.4	× 88 / 304	−9.1
4	63,804	2434.6	− 2473	−38.4	× 120 / 304	−15.2
5	63,807	2469.0	− 2502	−33	× 96 / 304	−10.4
Sum, rounded to a whole point						−35

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	59,173	2399.5	− 2432	−32.5	× 95 / 296	−10.4
4	59,175	2466.7	− 2473	−6.3	× 86 / 296	−1.8
5	59,177	2502.9	− 2502	0.9	× 115 / 296	0.3
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	60,908	2425.8	− 2432	−6.2	× 106 / 289	−2.3
4	60,910	2480.5	− 2473	7.5	× 99 / 289	2.6
5	60,913	2553.4	− 2502	51.4	× 84 / 289	14.9
Sum, rounded to a whole point						15

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	61,027	2440.5	− 2432	8.5	× 90 / 297	2.6
4	61,030	2489.3	− 2473	16.3	× 106 / 297	5.8
5	61,031	2516.8	− 2502	14.8	× 101 / 297	5
Sum, rounded to a whole point						13

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	61,262	2414.3	− 2432	−17.7	× 90 / 283	−5.6
4	61,263	2499.2	− 2473	26.2	× 87 / 283	8.1
5	61,264	2524.8	− 2502	22.8	× 106 / 283	8.5
Sum, rounded to a whole point						11

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	61,357	2394.6	− 2432	−37.4	× 98 / 372	−9.9
4	61,358	2453.7	− 2473	−19.3	× 106 / 372	−5.5
5	61,359	2494.3	− 2502	−7.7	× 105 / 372	−2.2
6	61,360	2513.2	− 2531	−17.8	× 33 / 372	−1.6
7	61,361	2543.1	− 2552	−8.9	× 30 / 372	−0.7
Sum, rounded to a whole point						−20

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	61,301	2379.5	− 2432	−52.5	× 98 / 393	−13.1
4	61,302	2458.6	− 2473	−14.4	× 97 / 393	−3.6
5	61,303	2491.4	− 2502	−10.6	× 110 / 393	−3
6	61,304	2487.4	− 2531	−43.6	× 32 / 393	−3.6
7	61,305	2502.8	− 2552	−49.2	× 33 / 393	−4.1
8	61,306	2506.8	− 2567	−60.2	× 23 / 393	−3.5
Sum, rounded to a whole point						−31

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	61,242	2393.5	− 2432	−38.5	× 111 / 382	−11.2
4	61,243	2420.2	− 2473	−52.8	× 98 / 382	−13.5
5	61,244	2506.0	− 2502	4	× 93 / 382	1
6	61,245	2472.5	− 2531	−58.5	× 27 / 382	−4.1
7	61,246	2463.5	− 2552	−88.5	× 24 / 382	−5.6
8	61,247	2500.6	− 2567	−66.4	× 29 / 382	−5
Sum, rounded to a whole point						−38

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	60,999	2418.4	− 2432	−13.6	× 109 / 395	−3.8
4	61,000	2454.7	− 2473	−18.3	× 117 / 395	−5.4
5	61,001	2498.8	− 2502	−3.2	× 104 / 395	−0.8
6	61,002	2453.6	− 2531	−77.4	× 22 / 395	−4.3
7	61,003	2495.0	− 2552	−57	× 21 / 395	−3
8	61,004	2533.5	− 2567	−33.5	× 22 / 395	−1.9
Sum, rounded to a whole point						−19

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −35, −12, 15, 13, 11, −20, −31, −38, −19 → −12.9
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 23 · 2016→2017: 27 · 2017→2018: 2 · 2018→2019: 2 · 2019→2022: 31 · 2022→2023: 11 · 2023→2024: 7 · 2024→2025: 19 → average 15.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 15.3 × 2.66 = 40.7. Upper limit 27.8, lower limit −53.6.

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.