A method of investigating differences in data produced by at least one analytical instrument comprising providing a first data set from a first sample in a plurality of data bins; providing a second data set from a second sample in a plurality of data bins; providing a data model of said data sets in which the data in a plurality of data bins from the first data set is linked to the data in the corresponding bins of the second data set, each linked pair having an associated switch parameter linking the two together; and, exploring the posterior probability distribution for the data model as a function of the switch parameters to produce a posterior probability distribution map.
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