Snow Elementary (Data source)
Source data for Snow Elementary
2015
| Step 1 | Step 2 | Step 3 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Get Mean Scale Score from line numbers in this data file. | Subtract 'met min' Scale Score. from Mean Scale Score to get Distance From Standard | Multiply Distance From Standard by proportion of students in grade. | ||||||||||||
| Grade | Line number |
Mean Scale Score |
- | Scale Score: met min |
= | Distance from standard |
* | (Students tested in grade |
/ | Students) tested in school |
= | Weighted Distance From Standard |
||
| 3 | 1387579 | 2400 | - | 2436 | = | -36 | * | (100 | / | 254) | = | -14.17322833 | ||
| 4 | 1387582 | 2390 | - | 2485 | = | -95 | * | (78 | / | 254) | = | -29.17322833 | ||
| 5 | 1387583 | 2452 | - | 2528 | = | -76 | * | (76 | / | 254) | = | -22.74015745 | ||
| Step 4 | SUM Weighted Distance From Standard to get 2015 Difference From Standard for Snow Elementary | -66 | ||||||||||||
2016
| Step 1 | Step 2 | Step 3 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Get Mean Scale Score from line numbers in this data file. | Subtract 'met min' Scale Score. from Mean Scale Score to get Distance From Standard | Multiply Distance From Standard by proportion of students in grade. | ||||||||||||
| Grade | Line number |
Mean Scale Score |
- | Scale Score: met min |
= | Distance from standard |
* | (Students tested in grade |
/ | Students) tested in school |
= | Weighted Distance From Standard |
||
| 3 | 43709 | 2384 | - | 2436 | = | -52 | * | (71 | / | 245) | = | -15.06938774 | ||
| 4 | 43710 | 2432 | - | 2485 | = | -53 | * | (98 | / | 245) | = | -21.2 | ||
| 5 | 43712 | 2422 | - | 2528 | = | -106 | * | (76 | / | 245) | = | -32.88163259 | ||
| Step 4 | SUM Weighted Distance From Standard to get 2016 Difference From Standard for Snow Elementary | -69 | ||||||||||||
2017
| Step 1 | Step 2 | Step 3 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Get Mean Scale Score from line numbers in this data file. | Subtract 'met min' Scale Score. from Mean Scale Score to get Distance From Standard | Multiply Distance From Standard by proportion of students in grade. | ||||||||||||
| Grade | Line number |
Mean Scale Score |
- | Scale Score: met min |
= | Distance from standard |
* | (Students tested in grade |
/ | Students) tested in school |
= | Weighted Distance From Standard |
||
| 3 | 44784 | 2392 | - | 2436 | = | -44 | * | (73 | / | 228) | = | -14.08771927 | ||
| 4 | 44785 | 2428 | - | 2485 | = | -57 | * | (62 | / | 228) | = | -15.49999997 | ||
| 5 | 44787 | 2451 | - | 2528 | = | -77 | * | (93 | / | 228) | = | -31.40789467 | ||
| Step 4 | SUM Weighted Distance From Standard to get 2017 Difference From Standard for Snow Elementary | -61 | ||||||||||||
2018
| Step 1 | Step 2 | Step 3 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Get Mean Scale Score from line numbers in this data file. | Subtract 'met min' Scale Score. from Mean Scale Score to get Distance From Standard | Multiply Distance From Standard by proportion of students in grade. | ||||||||||||
| Grade | Line number |
Mean Scale Score |
- | Scale Score: met min |
= | Distance from standard |
* | (Students tested in grade |
/ | Students) tested in school |
= | Weighted Distance From Standard |
||
| 3 | 44794 | 2376 | - | 2436 | = | -60 | * | (65 | / | 193) | = | -20.20725384 | ||
| 4 | 44797 | 2417 | - | 2485 | = | -68 | * | (65 | / | 193) | = | -22.90155435 | ||
| 5 | 44798 | 2444 | - | 2528 | = | -84 | * | (63 | / | 193) | = | -27.41968908 | ||
| Step 4 | SUM Weighted Distance From Standard to get 2018 Difference From Standard for Snow Elementary | -71 | ||||||||||||
2019
| Step 1 | Step 2 | Step 3 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Get Mean Scale Score from line numbers in this data file. | Subtract 'met min' Scale Score. from Mean Scale Score to get Distance From Standard | Multiply Distance From Standard by proportion of students in grade. | ||||||||||||
| Grade | Line number |
Mean Scale Score |
- | Scale Score: met min |
= | Distance from standard |
* | (Students tested in grade |
/ | Students) tested in school |
= | Weighted Distance From Standard |
||
| 3 | 44921 | 2385 | - | 2436 | = | -51 | * | (67 | / | 193) | = | -17.70466321 | ||
| 4 | 44922 | 2400 | - | 2485 | = | -85 | * | (66 | / | 193) | = | -29.06735744 | ||
| 5 | 44923 | 2424 | - | 2528 | = | -104 | * | (60 | / | 193) | = | -32.33160622 | ||
| Step 4 | SUM Weighted Distance From Standard to get 2019 Difference From Standard for Snow Elementary | -79 | ||||||||||||
Last steps
Compute the average
| 2015 | 2016 | 2017 | 2018 | 2019 | Sum | Average |
|---|---|---|---|---|---|---|
| -66 | -69 | -61 | -71 | -79 | -346.0 | -69.2 |
Compute the Upper Control Limit
Simply compute the standard deviation and multiply by 3 and add to the average: -51.2
Compute the Lower Control Limit
Simply compute the standard deviation and multiply by 3 and subtract from the average: -87.2
For the lines, you have the data necessary to plot the chart.
Very last step
The percent of students getting a Free or Reduced Price Meal comes from the following sources:
| 2015 | 2016 | 2017 | 2018 | 2019 | |
|---|---|---|---|---|---|
| Percent | 76% | 81% | 84% | 85% | 81% |
| Data source | 2015 data file | 2016 data file | 2017 data file | 2018 data file | 2019 data file |
Napa Valley Unified school district | County of Napa
THIS chart shows what the school system "wants"
PLUS a "special" or "outside" cause of variation: wealth/poverty.
NOT what teachers want.
NOT what principals want.
NOT what parents want.
Snow Elementary math proficiency
Zero+ meets standard.
65% less $meal
70% less $meal
68% less $meal
75% less $meal
71% less $meal
• Any result above zero is proficient; below is not proficient. • There is a 99% chance that results will remain the same in coming years, which is to say, between the Upper and Lower Control Limits (the gray lines). • The houses with the % of students receiving a Free or Reduced Price Meal is a measure of wealth/poverty.