A computer-implemented method for analyzing a first digital interaction performed by an entity arriving at a website, the method comprising acts of: identifying an anchor value X from the first digital interaction; identifying a first plurality of past digital interactions from which the anchor value X was previously observed, wherein each past digital interaction of the first plurality of past digital interactions has associated therewith a respective sameness score, which indicates a level of confidence that the entity engaging in the first digital interaction is a same user as previously observed with the anchor value X; selecting a second plurality of past digital interactions from the first plurality of past digital interactions based at least in part on the respective sameness scores; generating a profile for the anchor value X based on the second plurality of past digital interactions, wherein: the profile comprises historical information regarding each attribute of a plurality of attributes; and the plurality of attributes are selected based on measurements taken from the second plurality of past digital interactions; for at least one attribute A 1 of the plurality of attributes, determining a value V 1 based on one or more measurements taken from the first digital interaction, wherein the one or more measurements relate to a physical interaction between a user and a device; and determining a biometric score for the first digital interaction at least in part by comparing the value V 1 of the at least one attribute A 1 against the historical information regarding the at least one attribute A 1, wherein the biometric score indicates an extent to which the one or more measurements taken from the first digital interaction match one or more patterns from the profile. identifying an anchor value X from the first digital interaction; identifying a first plurality of past digital interactions from which the anchor value X was previously observed, wherein each past digital interaction of the first plurality of past digital interactions has associated therewith a respective sameness score, which indicates a level of confidence that the entity engaging in the first digital interaction is a same user as previously observed with the anchor value X; selecting a second plurality of past digital interactions from the first plurality of past digital interactions based at least in part on the respective sameness scores; generating a profile for the anchor value X based on the second plurality of past digital interactions, wherein: the profile comprises historical information regarding each attribute of a plurality of attributes; and the plurality of attributes are selected based on measurements taken from the second plurality of past digital interactions; the profile comprises historical information regarding each attribute of a plurality of attributes; and the plurality of attributes are selected based on measurements taken from the second plurality of past digital interactions; for at least one attribute A 1 of the plurality of attributes, determining a value V 1 based on one or more measurements taken from the first digital interaction, wherein the one or more measurements relate to a physical interaction between a user and a device; and determining a biometric score for the first digital interaction at least in part by comparing the value V 1 of the at least one attribute A 1 against the historical information regarding the at least one attribute A 1, wherein the biometric score indicates an extent to which the one or more measurements taken from the first digital interaction match one or more patterns from the profile.