A method and apparatus for handling data related to users in a telecommunication network to support analysis of said users. Plural sets of parameter values relating to the users are read once, and a first level quantization cell is determined for each set of parameter values according to a default first level quantization scheme. Then, clusters of first level quantization cells populated by users are identified and an adaptive second level quantization scheme is formed by translating the identified clusters into second level quantization cells. Representative parameter values are also assigned to each second level quantization cell, wherein the representative parameter values are used for analyzing the users.