In this paper, on time series of fraud detected customers, the performance of XMR charts method is tested for fraud detection of those same customers. For detection of anomalies in time series of registered consumed energy, statistical method of XMR charts was chosen. In the article of Wheeler: ‘‘The Chart for Individual values’’, it is stated this method was found by Jennet in the year of 1942. In fifties years of the last century (more precisely, from1943 to 1953), XMR charts are frequently used in the General Electric Co. in Wembley. In 1980, Wheeler was started again to use this chart in chemical industry. The third and the fourth chapter, in more detail, will be described formation and interpretation of these charts.
For better overview of XMR charts method position, the basic performances of its use in SPC are given. Statistical process control is done by control charts which are based on statistic characteristics of the process. In the range of X chart, applied method is followed by basic (single) chart characteristic of the process and, in that meaning, it is an individual chart. This chart is followed by the process with sample size of n = 1. X chart is frequently used in non-manufacturing situations. One of this chart characteristics is long interval between observations. The chart range or R chart is followed by ranges between successive process characteristics. The ranges which are found on this way are the basis for process variability estimation. Simultaneously, XMR chart is also followed by process and range characteristic, so it is mutual or simultaneous chart. Process parameters can be known or ‘‘standard known’’ based on external specifications or long term experience.