1. A method for analyzing data included in a database, the data being in the form of a plurality of records each containing a number of variables, the method including the steps of: selecting a set of the number of variables as an input set and another of the number of variables as an output variable; producing a subset of said plurality of records having a high average value for the output variable with matching input variables applying an on-line analytical processing function to the subset of said plurality of records and the plurality of records to compare the records outside those of the subset to the records of the subset.