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	86144	2404	-	2436	=	-32	*	(72	/	210)	=	-10.97142854
4	86147	2423	-	2485	=	-62	*	(59	/	210)	=	-17.41904756
5	86148	2490	-	2528	=	-38	*	(79	/	210)	=	-14.29523809
Step 4	SUM Weighted Distance From Standard to get 2015 Difference From Standard for Bella Vista Elementary											-43

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	2412	2432	-	2436	=	-4	*	(83	/	218)	=	-1.52293578
4	2413	2441	-	2485	=	-44	*	(75	/	218)	=	-15.13761467
5	2416	2481	-	2528	=	-47	*	(60	/	218)	=	-12.93577978
Step 4	SUM Weighted Distance From Standard to get 2016 Difference From Standard for Bella Vista Elementary											-30

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	2484	2432	-	2436	=	-4	*	(60	/	207)	=	-1.15942029
4	2486	2482	-	2485	=	-3	*	(79	/	207)	=	-1.14492754
5	2488	2453	-	2528	=	-75	*	(68	/	207)	=	-24.63768113
Step 4	SUM Weighted Distance From Standard to get 2017 Difference From Standard for Bella Vista Elementary											-27

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	2488	2442	-	2436	=	6	*	(57	/	189)	=	1.80952381
4	2489	2486	-	2485	=	1	*	(57	/	189)	=	0.3015873
5	2491	2490	-	2528	=	-38	*	(75	/	189)	=	-15.07936505
Step 4	SUM Weighted Distance From Standard to get 2018 Difference From Standard for Bella Vista Elementary											-13

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	2509	2438	-	2436	=	2	*	(73	/	196)	=	0.74489796
4	2510	2442	-	2485	=	-43	*	(60	/	196)	=	-13.16326526
5	2511	2486	-	2528	=	-42	*	(63	/	196)	=	-13.49999998
Step 4	SUM Weighted Distance From Standard to get 2019 Difference From Standard for Bella Vista Elementary											-26

Last steps

Compute the average

2015	2016	2017	2018	2019	Sum	Average
-43	-30	-27	-13	-26	-139.0	-27.8

Compute the Upper Control Limit

Simply compute the standard deviation and multiply by 3 and add to the average: 2.2

Compute the Lower Control Limit

Simply compute the standard deviation and multiply by 3 and subtract from the average: -57.8

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	82%	86%	77%	79%	79%
Data source	2015 data file	2016 data file	2017 data file	2018 data file	2019 data file