When it comes to Venn Diagrams most people use a combination of Microsoft PowerPoint to generate two or three way Venn diagrams, and use filtering in Excel to count the numbers in each group. Not many people know about the four way Venn diagram and when it comes to counting the numbers in each of the 16 groups and inputting the figures into the right group it is usually done nervously and is very time consuming.
There are some websites that enable you to create 2, 3, and 4 way Venn Diagrams quite easily, however they only work with qualitative data, assume that all the elements are within the union of the groups, and do not offer you the ability to drill down in to each of the 16 groups to see the elements that are making up the groups.
This paper shows how you can combine SAS Macro, logical data steps, DSGI, and HTML to generate 2, 3 and 4 Way Venn Diagrams with Drill Down Functionality very quickly. This algorithm is very useful when looking at results of transcriptomic experiments because of the huge volume of data.