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Cokriging, using the ETM+ panchromatic band as the secondary variable, proved slightly more accurate than kriging.
Cokriging estimation employs the secondary variable to estimate the first variable.
The Markov models ( MM1 or MM2) can only be solved with simple cokriging; using ordinary cokriging would lead to ignoring the secondary variable since the sum of weights for the secondary variable must be equal to zero.
Furthermore, employing porosity as the secondary variable would add some unique features to the estimation of log K, and these features cannot be captured by either of the simple kriging and ordinary kriging methods via a single variogram model.
Where stratification was based on two variables, the secondary variable CC was chosen as it is also closely related to stand volume and the two variables together form the best prediction pair for stand volume.
where x is called the primary variable with the domain of X. J x ⊆ [0, 1] is the primary membership of x, u is the secondary variable, and ∫ u ∈ J x 1 u Open image in new window is the secondary MF at x.
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Their first derivatives are the secondary variables.
Specifically, we consider the case where, given the primary variables, the evaluation of the secondary variables is computationally expensive.
And a novel grey relation analysis method as a way to determine the secondary variables is proposed.
Once in vivo, the accurate and reproducible assessment of TKR design mechanics is exceedingly difficult, with the secondary variables of the patient and the surgical technique hindering research.
The error associated with the secondary variables can be reduced by up to 0.015 m3 m−3 by targeting the half range of the density variations.
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