1. A method comprising: obtaining a DNA sample from an individual; determining the genotype of the individual based on the DNA sample; accessing, from a non-transitory computer readable storage medium of a computing device, a plurality of reference panels each associated with one of a plurality of different communities, each community comprising a plurality of nodes, each node corresponding to a reference genotype of a different reference individual; determining, with a computer processor associated with the computing device, amounts of DNA overlap between the genotype and each of the reference panels; for each reference panel, inputting the amount of DNA overlap between the genotype and the reference panel into a model specific for a community associated with the reference panel to generate a score for the community with respect to the genotype, the model comprising a first set of features defined from amounts of DNA overlap between reference individuals in the reference panel of that community and a second set of features defined as the number of connections between the individual and individuals in one of the reference panels within specified ranges of amounts of estimated IBD; and generating, with the computer processor, a report summarizing the communities for which the individual's score exceeds a threshold.