Abstract: A computer implemented method includes determining a hierarchical graph of a network of entities. The method further includes determining event data from a plurality of events. The method also includes applying a plurality of statistical models on the event data corresponding to each of the plurality of the events and the hierarchical graph. Each of the statistical models generates a model output data for each of the plurality of events. The method further includes generating a model output data based on the model output data corresponding to each of the plurality of statistical models by using a first cost function. The method also includes generating a set of data based on the model output data by using a second cost function. The method further includes determining one or more entities of the network experiencing packet loss based on the set of data.

Abstract: A network endpoint may issue network traces directed to another endpoint. Completed traces may provide information pertaining to possible paths between the endpoints. In response to a failed trace, a component along a possible path between the endpoints may be associated with a value that indicates an assessed contribution of the component to the network failure. The value may be used to initialize a parameter to a statistical calculation that iteratively refines the estimate to form a probability estimate regarding a likelihood that the component is contributing to a network fault.