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
11	2346260	2578	-	2628	=	-50	*	(150	/	150)	=	-50.0
Step 4	SUM Weighted Distance From Standard to get 2015 Difference From Standard for High Tech High Chula Vista											-50

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
11	71709	2563	-	2628	=	-65	*	(158	/	158)	=	-65.0
Step 4	SUM Weighted Distance From Standard to get 2016 Difference From Standard for High Tech High Chula Vista											-65

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
11	73611	2568	-	2628	=	-60	*	(161	/	161)	=	-60.0
Step 4	SUM Weighted Distance From Standard to get 2017 Difference From Standard for High Tech High Chula Vista											-60

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
11	73749	2565	-	2628	=	-63	*	(147	/	147)	=	-63.0
Step 4	SUM Weighted Distance From Standard to get 2018 Difference From Standard for High Tech High Chula Vista											-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
11	74213	2550	-	2628	=	-78	*	(131	/	131)	=	-78.0
Step 4	SUM Weighted Distance From Standard to get 2019 Difference From Standard for High Tech High Chula Vista											-78

Last steps

Compute the average

2015	2016	2017	2018	2019	Sum	Average
-50	-65	-60	-63	-78	-316.0	-63.2

Compute the Upper Control Limit

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

Compute the Lower Control Limit

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

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	51%	51%	50%	54%	52%
Data source	2015 data file	2016 data file	2017 data file	2018 data file	2019 data file