1. A computer-implemented method, comprising: accessing usage data representing resource accesses on a network by client devices in a plurality of households; determining, based on the accessed usage data, a set of the households that the usage data indicates are associated with a specified number and type of client devices; extracting a subset of the usage data, the subset corresponding to resource accesses by client devices associated with the set of households; and determining usage information for the specified number and type of client devices based on the extracted subset of the usage data.