1. An article of manufacture including a non-transitory computer readable storage medium to physically store instructions, which when executed by a computer, cause the computer to: receive a hierarchical collection of items including one or more sub collections of items ordered in a hierarchy; determine a statistical measure of frequency of an item in a sub collection of items of the one or more sub collections of items; determine one or more statistical measures of weightages of the item defining a number of sub collections in the hierarchical collection of items in which the item appears and a number of sub collections in which the item appears; calculate a statistical measure of variability defining a number of occurrences of the item in the hierarchical collection of items across different sub collections; determine a relevance score of the item based on the statistical measure of frequency, the one or more statistical measures of weightages of the item and the statistical measure of variability; and based on the relevance score, present the item on a computer generated graphical user interface.