Tell Me Something I Don't Know: Randomization Strategies for Iterative Data Mining

TL;DR

This paper introduces randomization strategies for iterative data mining that account for previously discovered patterns, helping to distinguish genuine data properties from artifacts of other methods.

Contribution

It proposes a novel Metropolis sampling-based randomization approach for iterative data mining that preserves known patterns while exploring data.

Findings

Randomization helps identify true data properties.

Clustering results can imply frequent pattern discovery.

Method is effective on real datasets.

Abstract

There is a wide variety of data mining methods available, and it is generally useful in exploratory data analysis to use many different methods for the same dataset. This, however, leads to the problem of whether the results found by one method are a reflection of the phenomenon shown by the results of another method, or whether the results depict in some sense unrelated properties of the data. For example, using clustering can give indication of a clear cluster structure, and computing correlations between variables can show that there are many significant correlations in the data. However, it can be the case that the correlations are actually determined by the cluster structure. In this paper, we consider the problem of randomizing data so that previously discovered patterns or models are taken into account. The randomization methods can be used in iterative data mining. At each step in the data mining process, the randomization produces random samples from the set of data matrices satisfying the already discovered patterns or models. That is, given a data set and some statistics (e.g., cluster centers or co-occurrence counts) of the data, the randomization methods sample data sets having similar values of the given statistics as the original data set. We use Metropolis sampling based on local swaps to achieve this. We describe experiments on real data that demonstrate the usefulness of our approach. Our results indicate that in many cases, the results of, e.g., clustering actually imply the results of, say, frequent pattern discovery.