covariance

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covariance

[kō′ver·ē·əns]
(statistics)
A measurement of the tendency of two random variables, X and Y, to vary together, given by the expected value of the variable (X-X [OB ])(Y-Y [OB ]), where X [OB ] and Y [OB ] are the expected values of the variables X and Y respectively.
References in periodicals archive ?
- Project implemented under financial means for the purchase of science and research apparatus constituting a large research infrastructure for 2019 granted by the Minister of Science and Higher Education - targeted subsidy for the implementation of the investment named: "Purchase of a system for analysis of gas exchange from agricultural land using the vortex covariance method" .
They used automated chamber systems, which operate independently of the eddy covariance method. A comparison of this estimate of soil respiration only with [R.sub.E_NB] of the entire ecosystem (938 g x C[m.sup.-2] x [yr.sup.-1] in 2012) again leads to the presumption that [R.sub.E_NB] does not fully capture the ecosystem respiration.
The areas shown in Figure 5 are calculated from the PSD functions generated by the covariance method. The features obtained from first channel data of EGG signals for fasting and satiety stages were not sufficient to differentiate the patient and the healthy group.
The Covariance Method. The covariance method is similar to the Yule-Walker method in that it minimizes the forward prediction error in the least-squares sense, but it does not consider any windowing of the data.
Scherbaum: Instantaneous polarization attributes based on an adaptive approximate covariance method, Geophysics, 71, V99-V104 (2006).