Abstract: Systems are provided for anonymously tracking and/or analyzing transitioning, flow or movement of individual subjects between health states or health-related subject states. There is provided a system for enabling anonymous estimation of the amount and/or flow of individual subjects, referred to as individuals, in a population transitioning and/or moving and/or coinciding between two or more health states or health-related subject states. The system receives identifying data from two or more individuals; generates, online and by one or more processors, an anonymized identifier for each individual; and stores: the anonymized identifier of each individual together with data representing a health state or health-related subject state; and/or a skew measure of such an anonymized identifier.

Abstract: Systems are provided for anonymously tracking and/or analysing Web-based flow or movement of individual subjects and/or objects. In particular, there is provided a system for enabling anonymous estimation of the amount and/or flow of individuals, in a population moving and/or coinciding between two or more Web-based subject states. The system receives identifying data from two or more individuals; generates, online and by one or more processors, an anonymized identifier for each individual; and stores: the anonymized identifier of each individual together with data representing a Web-based subject state; and/or a skew measure of such an anonymized identifier.