Results 251 to 260 of about 309,621 (292)

Identifying the demographic pathways linking environmental covariates to population dynamics in an avian migrant. [PDF]

Ecol Appl
Martin EC, Riecke TV, Ravussin PA, Arrigo D, Schaub M.   +4 more
europepmc   +1 more source

Covariate selection strategies and estimands - a review of current practice of risk factor analysis from a causal perspective. [PDF]

BMC Med Res Methodol
Reinhammar R, Waernbaum I.
europepmc   +1 more source

Implementation of a Mobile Digital Tool Supporting Medication for Opioid Use Disorder Treatment Improves Retention: Stepped-Wedge Cluster Randomized Controlled Trial.

J Med Internet Res
Palacios JE, Sherrick R, Janssen T, Deuble E, Lorenzen S, Schaefer M, Tregarthen J.   +6 more
europepmc   +1 more source

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COVARIANCE EFFECT

Macroeconomic Dynamics, 2002
If one drops the strong assumption that firms and households know all of the relevant parameters, and instead models agents as learning these parameters, the estimated parameters become random variables. Taking expectations several periods into the future may then involve taking the expectation of a product of random variables.
Moore, Bartholomew, Schaller, Huntley
openaire   +1 more source

Outlyingness Weighted Covariation

SSRN Electronic Journal, 2008
Quadratic covariation is a popular descriptive measure for the volatility of a multivariate price process. It is consistently estimated by the sum of outer products of high-frequency returns. The proposed realized outlyingness weighted covariation (ROWCov) is a weighted sum of outer products of high-frequency returns and downweights returns that ...
Boudt, Kris, Croux, Christophe, Laurent, S.   +2 more
openaire   +3 more sources

Covariate-free and Covariate-dependent Reliability

Psychometrika, 2016
Classical test theory reliability coefficients are said to be population specific. Reliability generalization, a meta-analysis method, is the main procedure for evaluating the stability of reliability coefficients across populations. A new approach is developed to evaluate the degree of invariance of reliability coefficients to population ...
openaire   +2 more sources

Covariant Schr dinger operator

Journal of Physics A: Mathematical and General, 2002
Summary: We analyse the Schrödinger operator for a quantum scalar particle in a curved spacetime which is fibred over absolute time and is equipped with given spacelike metric, gravitational field and electromagnetic field. We approach the Schrödinger operator in three independent ways: in terms of covariant differentials induced by the quantum ...
MODUGNO, MARCO, J. JANYSKA
openaire   +1 more source