Email Surveillance Using Non-negative Matrix Factorization

Michael W. Berry () and Murray Browne ()
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Michael W. Berry: University of Tennessee
Murray Browne: University of Tennessee

Computational and Mathematical Organization Theory, 2005, vol. 11, issue 3, No 5, 249-264

Abstract: Abstract In this study, we apply a non-negative matrix factorization approach for the extraction and detection of concepts or topics from electronic mail messages. For the publicly released Enron electronic mail collection, we encode sparse term-by-message matrices and use a low rank non-negative matrix factorization algorithm to preserve natural data non-negativity and avoid subtractive basis vector and encoding interactions present in techniques such as principal component analysis. Results in topic detection and message clustering are discussed in the context of published Enron business practices and activities, and benchmarks addressing the computational complexity of our approach are provided. The resulting basis vectors and matrix projections of this approach can be used to identify and monitor underlying semantic features (topics) and message clusters in a general or high-level way without the need to read individual electronic mail messages.

Keywords: electronic mail; Enron collection; non-negative matrix factorization; surveillance; topic detection; constrained least squares (search for similar items in EconPapers)
Date: 2005
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Citations: View citations in EconPapers (3)

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DOI: 10.1007/s10588-005-5380-5

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