The invention includes a method and apparatus for determining a coincidence count associated with a traffic flow in a network. The method includes receiving a first packet having a first flow identifier associated with one of the traffic flows, comparing the first flow identifier of the first packet to each of a plurality of other flow identifiers associated with a respective plurality of other packets, and determining a coincidence count associated with the first flow identifier based on the comparison of the first flow identifier to each of the plurality of other flow identifiers. The method for determining a coincidence count associated with one of a plurality of traffic flows may be extended for determining respective coincidence counts associated with a plurality of traffic flows. The determined coincidence counts may be used for determining at least one traffic flow statistic.