An adjacency matrix allows you to see items that frequently appear together in a way that enables efficient sorting. Each block demonstrates where the two controls on the axis appear in one or more CSF subcategories together.
When the controls on the X and Y axis appear together in one or more CSF subcategories, the matrix cell at their intersection is shaded. The darkness of the shade indicates the number of co-occurrences.
You can also hover over each shaded cell to see how many intersections have occurred. Click on a cell to get detailed information about the intersections. Finally, you can sort the matrix by control ID and co-occurrence frequency.