1. A method, comprising: performing, using one or more computer systems, receiving a first set of vectors, each vector in the first set of vectors representing a network event generated, at least in part, by a telecommunication network testing system, each vector in the first set of vectors including a plurality of dimensions and a first plurality of values, each of the first plurality of values associated with a corresponding one of the plurality of dimensions; identifying a second set of vectors representing at least a portion of the network events as observed by a telecommunication network monitoring system distinct from the telecommunication network testing system, each vector in the second set of vectors including the plurality of dimensions and a second plurality of values, each of the second plurality of values associated with a corresponding one of the plurality of dimensions, and each vector in the second set of vectors corresponding to a vector in the first set of vectors; calculating a presence score as a ratio between a number of vectors in the second set of vectors and a number of vectors in the first set of vectors.