Terminology Graph - Systolic Pressure

Difficulty Level

Beginner

Published on : 13/09/2021

The script begins by initializing ODS options for graphical output (output path, DPI resolution). It then defines a reusable graph template (`STATGRAPH Terminology`) via `PROC TEMPLATE`. This template includes a title, a footnote, a two-row lattice layout, an overlay graph combining a histogram and density curves (normal and kernel) with a legend, and a horizontal box plot. Finally, `PROC SGRENDER` is used to apply this template to `sashelp.heart` data, filtered for individuals with 'ageatstart' greater than 50, and to visualize the 'Systolic' variable as a dynamic variable.

Data Analysis

Type : SASHELP

The script uses the internal SASHELP.HEART dataset. A filter is applied to select records where 'ageatstart' is greater than 50.

1 Code Block

Macros / ODS

Explanation :
Initializes ODS (Output Delivery System) options for graph generation. Defines the output path (`gpath`) and image resolution (`dpi`). The default HTML destination is closed to avoid unwanted output and ensure that only graphical output is produced.

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1	%let gpath='.'; /--Put your Folder Name here--/
2	%let dpi=300;
3	ods listing style=listing image_dpi=&dpi gpath=&gpath;
4	ods html close;

2 Code Block

PROC TEMPLATE (STATGRAPH)

Explanation :
Defines a graph template named 'Terminology' using the SGPLOT language. This template creates a complex graph composed of a title, a footnote, a histogram, density curves (normal and kernel) with a discrete legend, and a box plot. It is designed to accept a dynamic variable `_var` which will be specified when calling the template.

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1	PROC TEMPLATE;
2	define statgraph Terminology;
3	dynamic _var;
4	begingraph;
5	entrytitle 'Distribution of Systolic Blood Pressure';
6	entryfootnote halign=left 'For Age at Start > 50' / textattrs=(size=7);
7
8	layout lattice / rowweights=(0.8 0.2) columns=1
9	columndatarange=union;
10	columnaxes;
11	columnaxis / display=(ticks tickvalues line);
12	endcolumnaxes;
13
14	layout overlay;
15	histogram _var / binaxis=false;
16	densityplot _var / name='n' legendlabel='Normal';
17	densityplot _var / kernel() lineattrs=graphfit2(pattern=solid)
18	name='k' legendlabel='Kernel';
19	discretelegend 'n' 'k' / location=inside halign=right valign=top across=1
20	itemsize=(linelength=20);
21	endlayout;
22
23	layout overlay;
24	boxplot y=_var / orient=horizontal boxwidth=0.8;
25	endlayout;
26
27	endlayout;
28
29	endgraph;
30	END;
31	RUN;

3 Code Block

PROC SGRENDER

Explanation :
Configures ODS graphical options for output (no border, 4-inch width, image name). Calls the previously defined 'Terminology' STATGRAPH template, providing it with `sashelp.heart` data (filtered for 'ageatstart > 50') and assigning the 'Systolic' variable to the template's dynamic `_var` variable. This generates and exports the final graph.

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1	ods graphics / reset noborder width=4in imagename='6_3_Terminology';
2	PROC SGRENDER DATA=sashelp.heart(where=(ageatstart > 50)) template=Terminology;
3	dynamic _var='Systolic';
4	RUN;

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Difficulty Level

Published on : 13/09/2021

Data Analysis

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