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	216300	2380	-	2436	=	-56	*	(89	/	273)	=	-18.25641026
4	216303	2433	-	2485	=	-52	*	(93	/	273)	=	-17.71428568
5	216304	2425	-	2528	=	-103	*	(91	/	273)	=	-34.3333333
Step 4	SUM Weighted Distance From Standard to get 2015 Difference From Standard for Rio Vista Elementary											-70

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	6397	2380	-	2436	=	-56	*	(87	/	265)	=	-18.38490562
4	6400	2446	-	2485	=	-39	*	(94	/	265)	=	-13.83396226
5	6401	2437	-	2528	=	-91	*	(84	/	265)	=	-28.84528301
Step 4	SUM Weighted Distance From Standard to get 2016 Difference From Standard for Rio Vista Elementary											-61

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	6574	2392	-	2436	=	-44	*	(85	/	261)	=	-14.32950191
4	6575	2424	-	2485	=	-61	*	(83	/	261)	=	-19.39846738
5	6578	2438	-	2528	=	-90	*	(93	/	261)	=	-32.06896551
Step 4	SUM Weighted Distance From Standard to get 2017 Difference From Standard for Rio Vista Elementary											-66

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	6577	2375	-	2436	=	-61	*	(90	/	261)	=	-21.03448275
4	6579	2434	-	2485	=	-51	*	(85	/	261)	=	-16.6091954
5	6581	2450	-	2528	=	-78	*	(86	/	261)	=	-25.70114937
Step 4	SUM Weighted Distance From Standard to get 2018 Difference From Standard for Rio Vista Elementary											-63

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	6633	2361	-	2436	=	-75	*	(78	/	248)	=	-23.58870968
4	6634	2411	-	2485	=	-74	*	(90	/	248)	=	-26.85483865
5	6635	2469	-	2528	=	-59	*	(80	/	248)	=	-19.03225806
Step 4	SUM Weighted Distance From Standard to get 2019 Difference From Standard for Rio Vista Elementary											-69

Last steps

Compute the average

2015	2016	2017	2018	2019	Sum	Average
-70	-61	-66	-63	-69	-329.0	-65.8

Compute the Upper Control Limit

Simply compute the standard deviation and multiply by 3 and add to the average: -56.8

Compute the Lower Control Limit

Simply compute the standard deviation and multiply by 3 and subtract from the average: -74.8

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	92%	90%	92%	93%	86%
Data source	2015 data file	2016 data file	2017 data file	2018 data file	2019 data file