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	1438057	2425	-	2436	=	-11	*	(72	/	213)	=	-3.71830986
4	1438060	2480	-	2485	=	-5	*	(69	/	213)	=	-1.61971831
5	1438061	2473	-	2528	=	-55	*	(72	/	213)	=	-18.5915493
Step 4	SUM Weighted Distance From Standard to get 2015 Difference From Standard for Harold Ambuehl Elementary											-24

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	45273	2423	-	2436	=	-13	*	(67	/	204)	=	-4.26960784
4	45275	2496	-	2485	=	11	*	(72	/	204)	=	3.88235294
5	45277	2486	-	2528	=	-42	*	(65	/	204)	=	-13.3823529
Step 4	SUM Weighted Distance From Standard to get 2016 Difference From Standard for Harold Ambuehl Elementary											-14

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	46482	2391	-	2436	=	-45	*	(81	/	220)	=	-16.56818181
4	46485	2475	-	2485	=	-10	*	(70	/	220)	=	-3.18181818
5	46487	2495	-	2528	=	-33	*	(69	/	220)	=	-10.34999998
Step 4	SUM Weighted Distance From Standard to get 2017 Difference From Standard for Harold Ambuehl Elementary											-30

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	46492	2430	-	2436	=	-6	*	(56	/	199)	=	-1.68844221
4	46495	2473	-	2485	=	-12	*	(78	/	199)	=	-4.70351758
5	46496	2502	-	2528	=	-26	*	(65	/	199)	=	-8.49246229
Step 4	SUM Weighted Distance From Standard to get 2018 Difference From Standard for Harold Ambuehl Elementary											-15

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	46675	2409	-	2436	=	-27	*	(68	/	206)	=	-8.91262135
4	46676	2462	-	2485	=	-23	*	(63	/	206)	=	-7.03398057
5	46677	2479	-	2528	=	-49	*	(75	/	206)	=	-17.83980578
Step 4	SUM Weighted Distance From Standard to get 2019 Difference From Standard for Harold Ambuehl Elementary											-34

Last steps

Compute the average

2015	2016	2017	2018	2019	Sum	Average
-24	-14	-30	-15	-34	-117.0	-23.4

Compute the Upper Control Limit

Simply compute the standard deviation and multiply by 3 and add to the average: 0.6

Compute the Lower Control Limit

Simply compute the standard deviation and multiply by 3 and subtract from the average: -47.4

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	37%	36%	32%	38%	39%
Data source	2015 data file	2016 data file	2017 data file	2018 data file	2019 data file