Set Functions

Allows you to do set functions on gene sets(union, intersection, and symmetric difference). Choose groups and use the pulldown Analysis menu to select which function you would like.


Using the Set Functions

Union

The Union operation allows you to combine two or more gene sets into a new set consisting of all of the genes in those sets. The union operation does not add the same gene more than once to the new set; as a result, the sum of the number of genes in the original sets may be greater than the number of genes in the union.


Intersect


Figure 1: Intersect
The Interesect operation gives you those genes shared by all selected sets. Only those genes shared by the selected sets will appear in the new set. Figure 1 shows a Venn diagram illustrating the component that appears in the Intersect.


Symmetric Difference


Figure 2: Symmetric Difference
The symmetric difference is the union of the sets minus the intersect. It represents those genes that only appear in one of the selected sets, and do not appear in any other. An example Venn diagram is shown in Figure 2.