A system for visualizing correlations between attributes in a data set or across multiple data sets is provided. A user may view a graphical representation (e.g., a histogram) of attribute values for a first attribute. The user may assign a variety of graphical indicators to various value ranges of the first attribute. The user may view a graphical representation of the second attributes. The user may “drag and drop” the graphical representation of the first attributes onto the graphical representation of the second attributes. The graphical representation of the second attributes may be updated to incorporate the graphical elements assigned by the user to the value ranges of the first attribute. The user may visually see potential correlations between the first and the second attributes based on the graphical elements associated with the first attributes displayed with the associated second attributes.