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	2138606	2394	-	2436	=	-42	*	(56	/	225)	=	-10.4533333
4	2138607	2438	-	2485	=	-47	*	(51	/	225)	=	-10.6533333
5	2138610	2458	-	2528	=	-70	*	(57	/	225)	=	-17.73333331
6	2138611	2445	-	2552	=	-107	*	(61	/	225)	=	-29.00888888
Step 4	SUM Weighted Distance From Standard to get 2015 Difference From Standard for Los Altos Elementary											-68

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	65653	2384	-	2436	=	-52	*	(45	/	188)	=	-12.4468085
4	65654	2446	-	2485	=	-39	*	(46	/	188)	=	-9.54255319
5	65656	2444	-	2528	=	-84	*	(43	/	188)	=	-19.21276594
6	65658	2486	-	2552	=	-66	*	(54	/	188)	=	-18.95744677
Step 4	SUM Weighted Distance From Standard to get 2016 Difference From Standard for Los Altos Elementary											-60

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	67470	2404	-	2436	=	-32	*	(39	/	183)	=	-6.81967213
4	67472	2442	-	2485	=	-43	*	(43	/	183)	=	-10.10382511
5	67474	2479	-	2528	=	-49	*	(43	/	183)	=	-11.51366117
6	67476	2468	-	2552	=	-84	*	(58	/	183)	=	-26.62295076
Step 4	SUM Weighted Distance From Standard to get 2017 Difference From Standard for Los Altos Elementary											-55

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	67577	2404	-	2436	=	-32	*	(38	/	168)	=	-7.23809523
4	67578	2429	-	2485	=	-56	*	(38	/	168)	=	-12.66666666
5	67581	2448	-	2528	=	-80	*	(48	/	168)	=	-22.8571428
6	67582	2497	-	2552	=	-55	*	(44	/	168)	=	-14.40476186
Step 4	SUM Weighted Distance From Standard to get 2018 Difference From Standard for Los Altos Elementary											-57

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	68092	2418	-	2436	=	-18	*	(44	/	166)	=	-4.77108432
4	68093	2444	-	2485	=	-41	*	(37	/	166)	=	-9.13855421
5	68094	2460	-	2528	=	-68	*	(33	/	166)	=	-13.51807224
6	68095	2501	-	2552	=	-51	*	(52	/	166)	=	-15.97590361
Step 4	SUM Weighted Distance From Standard to get 2019 Difference From Standard for Los Altos Elementary											-43

Last steps

Compute the average

2015	2016	2017	2018	2019	Sum	Average
-68	-60	-55	-57	-43	-283.0	-56.6

Compute the Upper Control Limit

Simply compute the standard deviation and multiply by 3 and add to the average: -29.6

Compute the Lower Control Limit

Simply compute the standard deviation and multiply by 3 and subtract from the average: -83.6

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	86%	77%	75%	84%	81%
Data source	2015 data file	2016 data file	2017 data file	2018 data file	2019 data file