Sentences with phrase «covariance methods»

In contrast to the distance - weighted approach, Steig et al. (2009) and Monaghan et al. (2008) used covariance methods to establish spatial relationships among the observing stations and the regions to be infilled.

Measurements of GPP by eddy covariance methods is auto - correlated with other components of the carbon cycle and is restricted to specific locations.

The variance - covariance method for the value at risk calculates the standard deviation of price movements of an investment or security.

Workshop participants recommended that steps should be taken to define air - sea fluxes as ECVs or EOVs, particularly for those fluxes that can be measured directly and for which there is consensus about measurement methods (e.g., air - sea heat and momentum exchanges using the eddy covariance method).

Not exact matches

In this course, students will learn how to use a set of quantitative methods referred to as the general linear model — regression, correlation, analysis of variance, and analysis of covariance — to address these and other questions that arise in educational, psychological, and social research.

No decisive quantitative evidence favors any one of the covariance estimation methods used in their construction.

In statistics, originally in geostatistics, Kriging or Gaussian process regression is a method of interpolation for which the interpolated values are modeled by a Gaussian process governed by prior covariances, as opposed to a piecewise - polynomial spline chosen to optimize smoothness of the fitted values

However, we typically use temporal persistence from 1 month to the next as well as spatial covariance (as carried out using all the mapping methods cited above).

[16][17] These methods modify the covariance matrix used in the computations and, consequently, the posterior ensemble is no longer made only of linear combinations of the prior ensemble.

It is obtained by combining the individual standard uncertainties ui (and covariances as appropriate), whether arising from a Type A evaluation or a Type B evaluation, using the usual method for combining standard deviations.

In the majority of cases, ebullition was measured with funnels or was lumped with diffusive flux via floating chamber measurements; however, in two studies, researchers estimated methane fluxes via eddy covariance (Eugster et al. 2011, Deshmukh et al. 2014), and in another two studies, researchers estimated ebullitive flux via acoustic methods (DelSontro et al. 2011, 2015).

Aquatic GHG fluxes are measured using a variety of techniques (e.g., floating chambers, thin boundary methods, eddy covariance towers, acoustic methods, and funnels; supplemental figure S1) that provide varying degrees of spatial and temporal coverage and accuracy (St. Louis et al. 2000).

Remember, the method looks for a blend of the most representative surface stations creating a region of influence based on covariance.

The latter method uses the variance - covariance matrix instead of correlation functions (Kagan, 1997).

Because of the multivariate nonnormality of the data and the ordinal, noncontinuous nature of the item data, the CFA model was specified via a polychoric correlation matrix and asymptotic covariance matrix and an unweighted least squares estimation method.39, 40 The matrices were generated in PRELIS 9.2 and analyzed with LISREL 9.241 and are available on request.

Three likelihood - based methods for mean and covariance structure analysis with nonnormal missing data