Data compression method for a classifier in a telecommunication environment utilizing aggregation of data over time periods of increasing length

A method of classifying a sample of values related to the use of a telephone service, the method comprising the steps of:

• (a) recording call data records in a server, each call data record identifying a subscriber to the telephone service and comprising at least a duration value and a date value;
• (b) reading on the fly the call data records from the server and identifying the call data records relative to the subscriber;
• (c) aggregating the identified call data records over a basic time interval in a respective database record assigned to the subscriber and the basic time interval, wherein
• the duration value of a current call data record is aggregated by incrementing a counter field of the database record, and
• the date value of the current call data record is aggregated by overwriting a respective field of the database record with the difference between the date value and a current date;
• (d) repeating step (c) for a number of successive basic time intervals, to form a first group of database records assigned to the subscriber;
• (e) when the first group is complete, aggregating the values of the database records of the first group in a database record assigned to the subscriber and an extended time interval;
• (f) repeating steps (c) thru (e) for a number of the extended time intervals, to form a second group of database records assigned to the subscriber;
• (g) configuring a classifier tool with a behavioral model formed of a weighted list of parameters;
• (h) forming a sample of values based on the contents of the first and second groups of database records;
• and
• (i) providing the sample of values as parameters to the classifier tool, whereby the classifier tool calculates a score representative of the adequacy of the sample with a target category.