Twentynine Palms 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	66,322	2428.7	− 2436	−7.3	× 66 / 301	−1.6
4	66,324	2439.6	− 2485	−45.4	× 83 / 301	−12.5
5	66,326	2489.7	− 2528	−38.3	× 82 / 301	−10.4
6	66,328	2498.4	− 2552	−53.6	× 70 / 301	−12.5
Sum, rounded to a whole point						−37

2016 from sb_ca2016_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	61,498	2397.3	− 2436	−38.7	× 95 / 333	−11
4	61,500	2452.4	− 2485	−32.6	× 72 / 333	−7
5	61,502	2474.1	− 2528	−53.9	× 86 / 333	−13.9
6	61,503	2507.6	− 2552	−44.4	× 80 / 333	−10.7
Sum, rounded to a whole point						−43

2017 from sb_ca2017_1_csv_v2.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	63,278	2426.9	− 2436	−9.1	× 77 / 314	−2.2
4	63,279	2433.8	− 2485	−51.2	× 91 / 314	−14.8
5	63,281	2488.6	− 2528	−39.4	× 67 / 314	−8.4
6	63,284	2485.9	− 2552	−66.1	× 79 / 314	−16.6
Sum, rounded to a whole point						−42

2018 from sb_ca2018_1_csv_v3.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	63,378	2391.7	− 2436	−44.3	× 83 / 312	−11.8
4	63,381	2455.1	− 2485	−29.9	× 76 / 312	−7.3
5	63,382	2468.2	− 2528	−59.8	× 88 / 312	−16.9
6	63,385	2482.4	− 2552	−69.6	× 65 / 312	−14.5
Sum, rounded to a whole point						−50

2019 from sb_ca2019_1_csv_v4.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	63,635	2421.1	− 2436	−14.9	× 86 / 306	−4.2
4	63,636	2427.6	− 2485	−57.4	× 70 / 306	−13.1
5	63,637	2461.6	− 2528	−66.4	× 77 / 306	−16.7
6	63,638	2491.5	− 2552	−60.5	× 73 / 306	−14.4
Sum, rounded to a whole point						−48

2022 from sb_ca2022_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	63,722	2387.8	− 2436	−48.2	× 76 / 278	−13.2
4	63,723	2453.2	− 2485	−31.8	× 73 / 278	−8.4
5	63,724	2420.7	− 2528	−107.3	× 62 / 278	−23.9
6	63,725	2484.7	− 2552	−67.3	× 67 / 278	−16.2
Sum, rounded to a whole point						−62

2023 from sb_ca2023_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	63,665	2392.3	− 2436	−43.7	× 68 / 263	−11.3
4	63,666	2467.0	− 2485	−18	× 74 / 263	−5.1
5	63,667	2450.0	− 2528	−78	× 64 / 263	−19
6	63,668	2475.5	− 2552	−76.5	× 57 / 263	−16.6
Sum, rounded to a whole point						−52

2024 from sb_ca2024_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	63,641	2412.8	− 2436	−23.2	× 82 / 288	−6.6
4	63,642	2453.4	− 2485	−31.6	× 70 / 288	−7.7
5	63,643	2426.5	− 2528	−101.5	× 72 / 288	−25.4
6	63,644	2495.6	− 2552	−56.4	× 64 / 288	−12.5
Sum, rounded to a whole point						−52

2025 from sb_ca2025_1_csv_v1.zip

Grade	Line in file	Average score	Standard Met	Distance	Students	Weighted
3	63,403	2398.5	− 2436	−37.5	× 90 / 319	−10.6
4	63,404	2475.6	− 2485	−9.4	× 82 / 319	−2.4
5	63,405	2461.3	− 2528	−66.7	× 67 / 319	−14
6	63,406	2458.1	− 2552	−93.9	× 80 / 319	−23.5
Sum, rounded to a whole point						−51

Step 2 · The average and the normal range

Average: add the yearly results and divide by how many there are. −37, −43, −42, −50, −48, −62, −52, −52, −51 → −48.6
Typical year-to-year change: how far the result moved from each year to the next, ignoring up or down. 2015→2016: 6 · 2016→2017: 1 · 2017→2018: 8 · 2018→2019: 2 · 2019→2022: 14 · 2022→2023: 10 · 2023→2024: 0 · 2024→2025: 1 → average 5.3
Normal range: multiply the typical change by 2.66, then add it to the average and subtract it. 5.3 × 2.66 = 14.1. Upper limit −34.5, lower limit −62.7.

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.