Visualisation

Plot 3-way Venn diagrams (using PROC GMAP) with values displayed in each set and/or set intersections.

%diagram_venn(idsn, var=, valpct=, valnum=, valid=, format=, label=, ofn=, odir=, ilib=,
              hover=, title=, fontSize=4, labelFontSize=4, imgFmt=gif, valColor=white, bgColor=white);;

Arguments

• idsn : name of the input dataset containing 3 set indicator variables along with a 4th variable (either a cell count, an id variable or a variable direclty containing the information to be displayed in each set or set intersections); see example below;
• var : (option) lists of set indicator variables, 3 in total; each of these variables is binary, taking value 1 for values in corresponding set, 0 for values outside of the corresponding set; when not passed, the 3 first variables of idsn dataset are retrieved (i.e., by varnum order) assuming they are correctly formatted;
• valpct : (option) if idsn consists of 3 set indicator variables and a variable (which could be a text variable) to be displayed on the plot, specify the corresponding variable name throught the valpct argument; this option is incompatible with options valnum and valid below;
• valnum : (option) if idsn already consists of cell counts to be displayed on the plot, then the variable where these cell counts can be found must be specified through the valnum argument; this option is incompatible with options valpct above and valid below;
• valid : (option) if idsn consists of a series of observations (patients) with an ID variable and 3 set indicator variables, then the ID variable should be specified through the valid argument; this option is incompatible with options valpct and valnum above;
• format : (option) SAS format in which values printed in each set should be displayed; default is percent8.1 when valpct is set, 8.1 otherwise;
• ofn : (option) name of the .html output file to be saved; an image will also be saved with the same name, with file extension as defined by imgFmt (see below); by default, no file is saved;
• odir : (option) path of the directory where output .html file and image (with generic name ofn) shall be saved; obviously ignored when ofn is not passed;
• title : (option) title to be displayed on top of the plot; default is "Venn Diagram - <idsn>", where <idsn> stands for the name of the input dataset idsn;
• label : (option) labels (3 in total) to be printed next to each set; default is to use each set indicator variable names available through var;
• hover : (option) formatted list of quoted items which contain text to be displayed when hovering over each set or set intersections with the mouse; the order of display in hover is given by the sequence: 1 2 3 12 23 13 123 where the number indicates the order of the variables in var which is concerned by the set or set intersection; in particular, hover must be of length 7 (number of sets in the Venn diagram); by default, hover is the concatenation of the corresponding set label(s);
• fontSize : (option) font size for values to be displayed in each set or set intersections; default: 4;
• labelFontSize : (option) font size for set labels; default: 4;
• imgFmt : (option)image format; default: imgFmt=gif; an alternative is png;
• valColor : (option)color of values displayed in sets; default: valColor=white.
• bgColor : (option)background color; default: bgColor=white;
• ilib : (option) name of the input library; by default: empty, i.e. WORK is used.

Example

We provide here an example presented in the original code (see note below).

Given the table Example in WORKing library:

DATA Example;
    input Scholars Students Athletes p;
cards;
1 0 0 0.07
0 1 0 0.23
0 0 1 0.12
1 1 0 0.03
0 1 1 0.08
1 0 1 0.04
1 1 1 0.02
;
run;

then running:

%diagram_venn(Example, var=Scholars Students Athletes, valpct=p, format=percent8.1);

will produce the following graphical result:

Run macro %_example_diagram_venn for examples.

Notes

1. The macro %diagram_venn is a wrapper to L. Joseph's original %VennDiagram macro which implements a 3-Way non-proportional Venn diagram. Original source code (no license, no disclaimer) is available at http://www.medicine.mcgill.ca/epidemiology/joseph/pbelisle/VennDiagram.html.
2. This macro creates Venn diagram using SAS/Graph PROC GMAP where each segment of the Venn diagram is a totally separate map area, so the color/drilldown/etc of each piece can be controlled separately.

References

1. Allison R. webpage on SAS/Graph samples from which the code is derived.
2. Harris, K. (2008): "How to generate 2, 3 and 4 way Venn diagrams with drill down functionality within 4 minutes!".
3. Li, S. (2009): "Customized proportional Venn diagrams from SAS system".
4. Kruger, H. (2011): ["Creating proportional Venn diagrams using Google and SAS"](Creating proportional Venn diagrams using Google and SAS).
5. Harris, K. (2008): "V is for Venn diagrams".

See also

venn, vennmap, VennDiagram, PROC GMAP.