1. A method, comprising: receiving, by an analysis device, an operating sample of data, the data indicating a plurality of performance measurements from a measurement point in a network, each of the plurality representing a single type of performance measurement made at the measurement point at each of a corresponding plurality of points in time; dividing, by the analysis device, the operating sample of data into a plurality of data points in a chronological order, each data point having a value corresponding to the performance measurements; ranking, by the analysis device, the data points in an ascending order; calculating, by the analysis device, a cumulative sum for each of the data points; calculating, by the analysis device, a change score for the set of data points, the change score indicating a change from a first one of the data points to a second one of the data points; and identifying, by the analysis device, a change point in the data set, if the change score exceeds a predetermined confidence level.