Abstract: In one implementation, a computer-implemented method includes accessing, upon authorization, behavior data that includes one or more time series of events indicating health-related behaviors of an individual; determining a behavior score for the individual based on the behavior data, the behavior score indicating the individual's latent behavior state; augmenting the behavioral score with medical data for the individual; identifying, by the computer system, a health-behavior phenotype for the individual based on a current position or trajectory of the augmented behavioral score within a latent health-behavior space that correlates the individual's augmented behavioral score with the health-behavior phenotype for the individual; assigning the individual to a particular population segment based, at least in part, on the current position or trajectory of the individual within the latent health-behavior space (i.e.

Abstract: In one implementation, a computer-implemented method includes receiving a request to perform an experiment across a plurality of client computing devices associated with a plurality of users, the request includes criteria for users to be included in the experiment and parameters for the experiment; obtaining information for the plurality of users; selecting a subset of the plurality of users for the experiment based, at least in part, on the information; determining a minimum population size to provide at least a threshold (i) level of anonymity for participants in the experiment and (ii) power calculation for results of the experiment, wherein the minimum population size is determined based, at least in part, on the subset of the plurality of users and the parameters for the experiment; providing information that identifies the minimum population size for the experiment.