1. A computer-implemented checking tool that is able to repeatedly process a plurality of data sets, each data set comprising data distributed according to a chosen statistical rule, the tool comprising: an estimator that is able to establish, for a data set, a value characterizing a criterion concerning data contained in the data set; a driver designed to call the estimator with a plurality of data sets in order to determine a plurality of values and to establish a new plurality of data sets on the basis of the plurality of values, wherein the driver repeats the estimator call each time with a new plurality of data sets previously established until a condition is verified that involves an extreme of the plurality of values and/or number of repetitions; a mixer that is able to establish a new data set on the basis of an existing data set while maintaining the distribution according to the chosen statistical rule; at least one hardware processor; wherein the driver is designed to call the mixer with at least a subset of the data sets as a function of a rule based on the plurality of values associated with the subset; wherein the rule includes the selection of data sets with the highest associated value; wherein the criterion of the estimator concerns the presence of a marking or tracing in the data set.