1. A method comprising: determining, by a system having a processor, a number of events that share a first collection of values of plural attributes; computing, by the system using a contingency calculation based on the number of events, a discriminative metric representing a statistical significance of the events that share the first collection of values of the plural attributes, the statistical significance represented by the computed discriminative metric indicating that the events that share the first collection of values of the plural attributes have a higher expected occurrence than events sharing a different collection of values of the plural attributes; displaying, by the system, a visualization that includes cells representing respective events, the visualization including a region containing a subset of the cells, and the visualization including plural axes respectively representing the plural attributes, wherein cells of the subset represent the events that share the first collection of values of the plural attributes; assigning, by the system, a visual characteristic of a significance visual indicator based on a value of the computed discriminative metric, the significance visual indicator placed in the visualization and associated with the region to indicate the statistical significance of the events sharing the first collection of values of the plural attributes; and responsive to user selection of the significance visual indicator in the visualization, causing display, by the system, of information regarding the subset of the cells associated with the selected significance visual indicator.