\begin{thebibliography}{27}
\expandafter\ifx\csname natexlab\endcsname\relax\def\natexlab#1{#1}\fi
\expandafter\ifx\csname url\endcsname\relax
  \def\url#1{{\tt #1}}\fi

\bibitem[Blake et~al.(1998)Blake, Keogh, and Merz]{uci98}
C.~Blake, E.~Keogh, and C.J. Merz.
\newblock \uppercase{UCI} repository of machine learning databases.
\newblock University of California, Irvine, Dept. of Information and Computer
  Science, URL=http://www.ics.uci.edu/$\sim$mlearn/\-MLRespository.html, 1998.

\bibitem[Breese et~al.(1998)Breese, Heckerman, and Kadie]{breese98}
J.S. Breese, D.~Heckerman, and C.~Kadie.
\newblock Emperical analysis of predictive algorithms for collaborative
  filtering.
\newblock In {\em Proceedings of Fourteenth Conference on Uncertainty in
  Artificial Intelligence}. Morgan Kaufmann, 1998.

\bibitem[Cortes and Vapnik(1995)]{CV95}
C.~Cortes and V.N. Vapnik.
\newblock Support vector networks.
\newblock {\em Machine Learning}, 20:\penalty0 273--297, 1995.

\bibitem[Dumais et~al.(1998)Dumais, Platt, Heckerman, and Sahami]{DPHS98}
S.~Dumais, J.~Platt, D.~Heckerman, and M.~Sahami.
\newblock Inductive learning algorithms and representations for text
  categorization.
\newblock In {\em Proceedings of the 1998 ACM 7th International Conference on
  Information and Knowledge Management}, pages 148--155, 1998.

\bibitem[Glassman()]{eachmovie}
S.~Glassman.
\newblock Eachmovie data set.
\newblock URL=http://research.compaq.com/SRC-/eachmovie/.

\bibitem[Golub and Van~Loan(1996)]{GV96}
G.H. Golub and C.F. Van~Loan.
\newblock {\em Matrix computations}.
\newblock Johns Hopkins University Press, Baltimore, MD, third edition, 1996.

\bibitem[Heckerman et~al.(2000)Heckerman, Chickering, Meek, Rounthwaite, and
  Kadie]{heckerman00}
David Heckerman, David~Maxwell Chickering, Christopher Meek, Robert
  Rounthwaite, and Carl Kadie.
\newblock Dependency networks for inference, collaborative filtering, and data
  visualization.
\newblock {\em Journal of Machine Learning Research}, 1:\penalty0 49--75, 2000.

\bibitem[Hoerl and Kennard(1970)]{HoKe70}
A.~E. Hoerl and R.~W. Kennard.
\newblock Ridge regression: Biased estimation for nonorthogonal problems.
\newblock {\em Technometrics}, 12\penalty0 (1):\penalty0 55--67, 1970.

\bibitem[Hofmann and Tresp(1997)]{hofmann97}
R.~Hofmann and V.~Tresp.
\newblock Nonlinear markov networks for continuous variables.
\newblock In {\em Advances in Neural Information Processing Systems 9, editors:
  M. Mozer, M. Jordan and T. Petsche}. MIT Press, 1997.

\bibitem[Iyengar and Zhang(2001)]{iyengar01}
V.S. Iyengar and T.~Zhang.
\newblock Empirical study of recommender systems using linear classifiers.
\newblock In {\em Proceedings of the Fifth Pacific-Asia Conference on Knowledge
  Discovery and Data Mining}, pages 16--27, 2001.

\bibitem[Joachims(1998)]{Joa98}
T.~Joachims.
\newblock Text categorization with support vector machines: learning with many
  relevant features.
\newblock In {\em European Conference on Machine Learing, ECML-98}, pages
  137--142, 1998.

\bibitem[Kearns and Mansour(1998)]{KM98}
M.~Kearns and Y.~Mansour.
\newblock A fast, bottom-up decision tree pruning algorithm with near optimal
  generalization.
\newblock In {\em Proceedings of the 15th International Conference on Machine
  Learning}, pages 269--277, 1998.

\bibitem[McCallum and Nigam(1998)]{MN98}
Andrew McCallum and Kamal Nigam.
\newblock A comparison of event models for naive bayes text classification.
\newblock In {\em AAAI/ICML-98 Workshop on Learning for Text Categorization},
  pages 41--48, 1998.

\bibitem[Quinlan(1993)]{Quinlan95}
J.~Quinlan.
\newblock {\em C4.5 programs for machine learning}.
\newblock Morgan Kaufmann Publishers, 1993.

\bibitem[Resnick et~al.(1994)Resnick, Iacovou, Suchak, Bergstrom, and
  Riedl]{resnick94}
P.~Resnick, N.~Iacovou, M.~Suchak, P.~Bergstrom, and J.~Riedl.
\newblock Grouplens: An open architecture for collaborative filtering of
  netnews.
\newblock In {\em Proceedings of CSCW}, 1994.

\bibitem[Ripley(1996)]{Ripley96}
B.D. Ripley.
\newblock {\em Pattern recognition and neural networks}.
\newblock Cambridge University Press, 1996.

\bibitem[Sarwar et~al.(2000)Sarwar, Karypis, Konstan, and Riedl]{sarwar00}
B.~Sarwar, G.~Karypis, J.~Konstan, and J.~Riedl.
\newblock Analysis of recommendation algorithms for e-commerce.
\newblock In {\em Proceedings ACM E-Commerce 2000 Conference}, 2000.

\bibitem[Shardanand and Maes(1995)]{shardanand95}
U.~Shardanand and P.~Maes.
\newblock Social information filtering: Algorithms for automating word of
  mouth.
\newblock In {\em Proceedings of CHI'95}, 1995.

\bibitem[Ungar and Foster(1998{\natexlab{a}})]{ungar98a}
L.~Ungar and D.~Foster.
\newblock Clustering methods for collaborative filtering.
\newblock In {\em Workshop on Recommendation Systems at the Fifteenth National
  Conference on AI}, 1998{\natexlab{a}}.

\bibitem[Ungar and Foster(1998{\natexlab{b}})]{ungar98b}
L.~Ungar and D.~Foster.
\newblock A formal statistical approach to collaborative filtering.
\newblock In {\em CONALD'98}, 1998{\natexlab{b}}.

\bibitem[Vapnik(1998)]{Vap98}
V.N. Vapnik.
\newblock {\em Statistical learning theory}.
\newblock John Wiley \& Sons, New York, 1998.

\bibitem[Weiss et~al.(1999)Weiss, Apte, Damerau, Johnson, Oles, Goetz, and
  Hampp]{Weiss99}
S.M. Weiss, C.~Apte, F.~Damerau, D.E. Johnson, F.~Oles, T.~Goetz, and T.~Hampp.
\newblock Maximizing text-mining performance.
\newblock {\em IEEE Intelligent Systems and their applications}, 14\penalty0
  (4):\penalty0 63--69, July/August 1999.

\bibitem[Willems et~al.(1995)Willems, Shtarkov, and Tjalkens]{WST}
F.M.J. Willems, Y.M. Shtarkov, and T.J. Tjalkens.
\newblock The context tree weighting method: basic properties.
\newblock {\em IEEE Trans. on Inform. Theory}, 41\penalty0 (3):\penalty0
  653--664, 1995.

\bibitem[Yang(1999)]{Yang99}
Yiming Yang.
\newblock An evaluation of statistical approaches to text categorization.
\newblock {\em Information Retrieval}, 1:\penalty0 69--90, 1999.

\bibitem[Yang and Chute(1994)]{YC94}
Yiming Yang and Christopher~G. Chute.
\newblock An example-based mapping method for text categorization and
  retrieval.
\newblock {\em ACM Transactions on Information Systems}, 12:\penalty0 252--277,
  1994.

\bibitem[Zhang(1998)]{Zhang98DCC}
Tong Zhang.
\newblock Compression by model combination.
\newblock In {\em Proceedings of IEEE Data Compression Conference, DCC'98},
  pages 319--328, 1998.

\bibitem[Zhang and Oles(2001)]{ZhaOle01}
Tong Zhang and Frank~J. Oles.
\newblock Text categorization based on regularized linear classification
  methods.
\newblock {\em Information Retrieval}, 4:\penalty0 5--31, 2001.

\end{thebibliography}
