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 correlated 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; calculating a Key Performance Indicator (KPI) indicative of user's experience quality for a selected one of the plurality of dimensions based, at least in part, upon values corresponding to the selected dimension in the second set of vectors; calculating a data integrity confidence value indicative of accuracy of the calculated KPI, based, at least in part, upon the presence score; and to adjust network services available to the user based on the calculated KPI and the calculated data integrity confidence value.