Results 71 to 80 of about 540,575 (323)

A Covariance Equation

open access: yesThe Journal of Geometric Analysis, 2019
Let $ $ be a commutative semigroup with identity $e$ and let $ $ be a compact subset in the pointwise convergence topology of the space $ '$ of all non-zero multiplicative functions on $ .$ Given a continuous function $F: \to \mathbb C$ and a complex regular Borel measure $ $ on $ $ such that $ ( ) \not = 0.$ It is shown that $$ ( ) \int_
openaire   +3 more sources

Pulse Pressure, White Matter Hyperintensities, and Cognition: Mediating Effects Across the Adult Lifespan

open access: yesAnnals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objectives To investigate whether pulse pressure or mean arterial pressure mediates the relationship between age and white matter hyperintensity load and to examine the mediating effect of white matter hyperintensities on cognition. Methods Demographic information, blood pressure, current medication lists, and Montreal Cognitive Assessment ...
Jade Hannan   +8 more
wiley   +1 more source

Effect of neighborhood and plot size on experiments with multiple-harvest oleraceous crops

open access: yesPesquisa Agropecuária Brasileira, 2014
The objective of this work was to determine the efficiency of the Papadakis method on the quality evaluation of experiments with multiple-harvest oleraceous crops, and on the estimate of the covariate and the ideal plot size.
Daniel Santos   +5 more
doaj   +1 more source

Covariance Hypotheses Which are Linear in Both the Covariance and the Inverse Covariance

open access: yesThe Annals of Statistics, 1988
both the covariance and the inverse covariance are products of models each of which consists of either (i) independent identically distributed random vectors which have a covariance with a real, complex or quaternion structure or (ii) independent identically distributed random vectors with a parametrization of the covariance which is given by means of ...
openaire   +3 more sources

Stage‐Dependent Inhibitory Connectivity in Striatal‐Motor Circuit in Huntington's Disease

open access: yesAnnals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Background Elucidating dysfunctional connectivity patterns among key brain regions in Huntington's disease (HD) underlying progression may have implications for developing treatment and therapeutic evaluation. Objective Explore the relationship between abnormal spontaneous resting‐state activity and atrophy in HD‐specific brain regions and ...
Yinghua Jing   +4 more
wiley   +1 more source

Complex Covariance

open access: yesActa Polytechnica, 2013
According to some generalized correspondence principle the classical limit of a non-Hermitian quantum theory describing quantum degrees of freedom is expected to be the well known classical mechanics of classical degrees of freedom in the complex phase space, i.e., some phase space spanned by complex-valued space and momentum coordinates.
openaire   +4 more sources

Sequence Analysis to Phenotype Health Care Patterns in Adults With Musculoskeletal Conditions Using Primary Care Electronic Health Records

open access: yesArthritis Care &Research, EarlyView.
Objective The aim of this study was to apply sequence analysis (SA) to phenotype health care patterns of adult patients with musculoskeletal (MSK) conditions using primary care electronic health records and to investigate the association between these health care patterns and patients’ self‐reported outcomes after consultation.
Smitha Mathew   +6 more
wiley   +1 more source

Exploring treatment by covariate interactions using subgroup analysis and meta-regression in cochrane reviews: a review of recent practice.

open access: yesPLoS ONE, 2015
BackgroundTreatment by covariate interactions can be explored in reviews using interaction analyses (e.g., subgroup analysis). Such analyses can provide information on how the covariate modifies the treatment effect and is an important methodological ...
Sarah Donegan   +4 more
doaj   +1 more source

Data-driven Algorithms for Dimension Reduction in Causal Inference

open access: yes, 2016
In observational studies, the causal effect of a treatment may be confounded with variables that are related to both the treatment and the outcome of interest.
de Luna, Xavier   +3 more
core   +1 more source

COVARIANT QUANTIZATION OF THE SUPERSTRING [PDF]

open access: yesInternational Journal of Modern Physics A, 2001
After reviewing the Green-Schwarz superstring using the approach of Siegel, the superstring is covariantly quantized by constructing a BRST operator from the fermionic constraints and a bosonic pure spinor ghost variable. Physical massless vertex operators are constructed and, for the first time, N-point tree amplitudes are computed in a manifestly ...
openaire   +8 more sources

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