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Selection: Liu:Y [3 articles] 

Publications by author Liu:Y.

Kernel-based measures of association

Wiley Interdisciplinary Reviews: Computational Statistics, Vol. 10, No. 2. (March 2018), e1422,


Measures of association have been widely used for describing statistical relationships between two sets of variables. Traditionally, such association measures focus on specialized settings. Based on an in‐depth summary of existing common measures, we present a general framework for association measures that unifies existing methods and novel extensions based on kernels, including practical solutions to computational challenges. Specifically, we introduce association screening and variable selection via maximizing kernel‐based association measures. We also develop a backward dropping procedure for feature selection when ...


How temperature, precipitation and stand age control the biomass carbon density of global mature forests

Global Ecology and Biogeography, Vol. 23, No. 3. (March 2014), pp. 323-333,


[::Aim] To understand: (1) how temperature, precipitation and stand age control the above-ground biomass carbon density (BCDa) of mature forests and its macroecology patterns across latitudes; (2) the age threshold for old-growth forests at a global scale. [::Location] Global forests. [::Methods] We compiled a database (897 sites) of mature forests between 80 and 1200 years old. The site data include latitude, longitude, mean annual temperature, mean annual precipitation, forest type, stand age, BCDa, living biomass (above- and below-ground biomass) carbon density and total (living plus dead) ...


Pacific origin of the abrupt increase in Indian Ocean heat content during the warming hiatus

Nature Geosci, Vol. 8, No. 6. (18 June 2015), pp. 445-449,


Global mean surface warming has stalled since the end of the twentieth century1, 2, but the net radiation imbalance at the top of the atmosphere continues to suggest an increasingly warming planet. This apparent contradiction has been reconciled by an anomalous heat flux into the ocean3, 4, 5, 6, 7, 8, induced by a shift towards a La Niña-like state with cold sea surface temperatures in the eastern tropical Pacific over the past decade or so. A significant portion of the ...

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