Potrero Elementary (Data source)
Source data for Potrero 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 | 691818 | 2368 | - | 2436 | = | -68 | * | (102 | / | 678) | = | -10.23008844 | ||
| 4 | 691819 | 2422 | - | 2485 | = | -63 | * | (91 | / | 678) | = | -8.45575221 | ||
| 5 | 691822 | 2443 | - | 2528 | = | -85 | * | (87 | / | 678) | = | -10.90707964 | ||
| 6 | 691823 | 2449 | - | 2552 | = | -103 | * | (86 | / | 678) | = | -13.06489667 | ||
| 7 | 691826 | 2499 | - | 2567 | = | -68 | * | (178 | / | 678) | = | -17.85250736 | ||
| 8 | 691827 | 2526 | - | 2586 | = | -60 | * | (134 | / | 678) | = | -11.85840702 | ||
| Step 4 | SUM Weighted Distance From Standard to get 2015 Difference From Standard for Potrero Elementary | -72 | ||||||||||||
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 | 21877 | 2387 | - | 2436 | = | -49 | * | (88 | / | 664) | = | -6.49397588 | ||
| 4 | 21878 | 2416 | - | 2485 | = | -69 | * | (97 | / | 664) | = | -10.07981925 | ||
| 5 | 21880 | 2457 | - | 2528 | = | -71 | * | (87 | / | 664) | = | -9.30271082 | ||
| 6 | 21883 | 2443 | - | 2552 | = | -109 | * | (90 | / | 664) | = | -14.77409631 | ||
| 7 | 21884 | 2480 | - | 2567 | = | -87 | * | (130 | / | 664) | = | -17.03313248 | ||
| 8 | 21886 | 2530 | - | 2586 | = | -56 | * | (172 | / | 664) | = | -14.50602406 | ||
| Step 4 | SUM Weighted Distance From Standard to get 2016 Difference From Standard for Potrero Elementary | -72 | ||||||||||||
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 | 22293 | 2395 | - | 2436 | = | -41 | * | (95 | / | 631) | = | -6.17274168 | ||
| 4 | 22296 | 2420 | - | 2485 | = | -65 | * | (90 | / | 631) | = | -9.27099836 | ||
| 5 | 22297 | 2432 | - | 2528 | = | -96 | * | (93 | / | 631) | = | -14.14896989 | ||
| 6 | 22300 | 2458 | - | 2552 | = | -94 | * | (90 | / | 631) | = | -13.40728994 | ||
| 7 | 22301 | 2500 | - | 2567 | = | -67 | * | (134 | / | 631) | = | -14.22820918 | ||
| 8 | 22303 | 2493 | - | 2586 | = | -93 | * | (129 | / | 631) | = | -19.0126782 | ||
| Step 4 | SUM Weighted Distance From Standard to get 2017 Difference From Standard for Potrero Elementary | -76 | ||||||||||||
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 | 22280 | 2394 | - | 2436 | = | -42 | * | (91 | / | 621) | = | -6.15458936 | ||
| 4 | 22282 | 2436 | - | 2485 | = | -49 | * | (93 | / | 621) | = | -7.33816425 | ||
| 5 | 22284 | 2460 | - | 2528 | = | -68 | * | (90 | / | 621) | = | -9.85507245 | ||
| 6 | 22286 | 2457 | - | 2552 | = | -95 | * | (90 | / | 621) | = | -13.76811592 | ||
| 7 | 22288 | 2520 | - | 2567 | = | -47 | * | (125 | / | 621) | = | -9.46054747 | ||
| 8 | 22290 | 2520 | - | 2586 | = | -66 | * | (132 | / | 621) | = | -14.02898548 | ||
| Step 4 | SUM Weighted Distance From Standard to get 2018 Difference From Standard for Potrero Elementary | -61 | ||||||||||||
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 | 22461 | 2425 | - | 2436 | = | -11 | * | (83 | / | 622) | = | -1.46784565 | ||
| 4 | 22462 | 2446 | - | 2485 | = | -39 | * | (90 | / | 622) | = | -5.64308679 | ||
| 5 | 22463 | 2456 | - | 2528 | = | -72 | * | (90 | / | 622) | = | -10.41800638 | ||
| 6 | 22464 | 2473 | - | 2552 | = | -79 | * | (90 | / | 622) | = | -11.43086811 | ||
| 7 | 22465 | 2523 | - | 2567 | = | -44 | * | (142 | / | 622) | = | -10.04501604 | ||
| 8 | 22466 | 2524 | - | 2586 | = | -62 | * | (127 | / | 622) | = | -12.65916397 | ||
| Step 4 | SUM Weighted Distance From Standard to get 2019 Difference From Standard for Potrero Elementary | -52 | ||||||||||||
Last steps
Compute the average
| 2015 | 2016 | 2017 | 2018 | 2019 | Sum | Average |
|---|---|---|---|---|---|---|
| -72 | -72 | -76 | -61 | -52 | -333.0 | -66.6 |
Compute the Upper Control Limit
Simply compute the standard deviation and multiply by 3 and add to the average: -39.6
Compute the Lower Control Limit
Simply compute the standard deviation and multiply by 3 and subtract from the average: -93.6
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 | 99% | 98% | 97% | 99% | 97% |
| Data source | 2015 data file | 2016 data file | 2017 data file | 2018 data file | 2019 data file |
El Monte City school district | County of Los Angeles
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.
Potrero Elementary math proficiency
Zero+ meets standard.
96% less $meal
93% less $meal
92% less $meal
94% less $meal
92% 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.