1. A computerized method for associating a user of an electronic system with a demographic group by measuring behavioral dynamics in operating an input device, comprising: accessing a first data characteristic of a user of an electronic system measured performing a first prescribed interaction with an input device of the electronic system; accessing a probability distribution representation for a first demographic group representative of a plurality of individuals within the first demographic group performing the first prescribed interaction; accessing a probability distribution representation for a wide population to include a plurality of demographic groups performing the first prescribed interaction; determining a first posterior probability whether the user is a member of the first demographic group, by comparing (a) the data characteristic of the user, (b) the probability distribution representation for the first demographic group, and (c) the probability distribution representation for the wide population; accessing a second data characteristic of a user of an electronic system performing a second prescribed interaction with an input device of the electronic system; accessing a probability distribution representation for a first demographic group representative of a plurality of individuals within the first demographic group performing the second prescribed interaction; and accessing a probability distribution representation for a wide population to include a plurality of demographic groups performing the second prescribed interaction; determining a second posterior probability whether the user is a member of the first demographic group, by comparing (a) the data characteristic of the user, (b) the probability distribution representation for the first demographic group, and (c) the probability distribution representation for the wide population, with regard to the second prescribed interaction; and associating the user with the first demographic group, when a total posterior probability, based on the first posterior probability and the second posterior probability, is above a prescribed threshold.