S
Sami Hanhijärvi
Researcher at University of Helsinki
Publications - 15
Citations - 1334
Sami Hanhijärvi is an academic researcher from University of Helsinki. The author has contributed to research in topics: Cluster analysis & Exploratory data analysis. The author has an hindex of 11, co-authored 15 publications receiving 1186 citations. Previous affiliations of Sami Hanhijärvi include Helsinki Institute for Information Technology & Helsinki University of Technology.
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Journal ArticleDOI
Continental-scale temperature variability during the past two millennia
Moinuddin Ahmed,Kevin J. Anchukaitis,Kevin J. Anchukaitis,Asfawossen Asrat,H. P. Borgaonkar,Martina Braida,Brendan M. Buckley,Ulf Büntgen,Brian M. Chase,Brian M. Chase,Duncan A. Christie,Duncan A. Christie,Edward R. Cook,Mark A. J. Curran,Mark A. J. Curran,Henry F. Diaz,Jan Esper,Ze-Xin Fan,Narayan Prasad Gaire,Quansheng Ge,Joelle Gergis,J. Fidel González-Rouco,Hugues Goosse,Stefan W. Grab,Nicholas E. Graham,Rochelle Graham,Martin Grosjean,Sami Hanhijärvi,Darrell S. Kaufman,Thorsten Kiefer,Katsuhiko Kimura,Atte Korhola,Paul J. Krusic,Antonio Lara,Antonio Lara,Anne-Marie Lézine,Fredrik Charpentier Ljungqvist,Andrew Lorrey,Jürg Luterbacher,Valérie Masson-Delmotte,Danny McCarroll,Joseph R. McConnell,Nicholas P. McKay,Mariano S. Morales,Andrew D. Moy,Andrew D. Moy,Robert Mulvaney,Ignacio A. Mundo,Takeshi Nakatsuka,David J. Nash,David J. Nash,Raphael Neukom,Sharon E. Nicholson,Hans Oerter,Jonathan G. Palmer,Jonathan G. Palmer,Steven J. Phipps,María Prieto,Andrés Rivera,Masaki Sano,Mirko Severi,Timothy M. Shanahan,Xuemei Shao,Feng Shi,Michael Sigl,Jason E. Smerdon,Olga Solomina,Eric J. Steig,Barbara Stenni,Meloth Thamban,Valerie Trouet,Chris S. M. Turney,Mohammed Umer,Tas van Ommen,Tas van Ommen,Dirk Verschuren,A. E. Viau,Ricardo Villalba,Bo Møllesøe Vinther,Lucien von Gunten,Sebastian Wagner,Eugene R. Wahl,Heinz Wanner,Johannes P. Werner,James W. C. White,Koh Yasue,Eduardo Zorita +86 more
TL;DR: The authors reconstructed past temperatures for seven continental-scale regions during the past one to two millennia and found that the most coherent feature in nearly all of the regional temperature reconstructions is a long-term cooling trend, which ended late in the nineteenth century.
Proceedings Article
Randomization Techniques for Graphs
TL;DR: This paper focuses on randomization techniques for unweighted undirected graphs for graph mining within the framework of statistical hypothesis testing, and describes three alternative algorithms based on local edge swapping and Metropolis sampling.
Proceedings ArticleDOI
Tell me something I don't know: randomization strategies for iterative data mining
TL;DR: The problem of randomizing data so that previously discovered patterns or models are taken into account, and the results indicate that in many cases, the results of, e.g., clustering actually imply theresults of, say, frequent pattern discovery.
Proceedings ArticleDOI
Tell Me Something I Don't Know: Randomization Strategies for Iterative Data Mining
TL;DR: In this paper, the problem of randomizing data so that previously discovered patterns or models are taken into account is considered, and the authors use Metropolis sampling based on local swaps to achieve this.
Journal ArticleDOI
Pairwise comparisons to reconstruct mean temperature in the Arctic Atlantic Region over the last 2,000 years
TL;DR: PaiCo as mentioned in this paper uses the ordering of all pairs of proxy observations within each record to arrive at a consensus time series that best agrees with all proxy records, which is subsequently calibrated to the instrumental record to provide an estimate of past climate.