My understanding of linear independance is that if you have a unique solution after rref, it's linear independant. If you have multiple solutions or no solution, it's not linear ...
An important problem in multivariate statistics is the estimation of covariance matrices. We consider a class of nonparametric covariance models in which the entries in the covariance matrix depend on ...
This is a preview. Log in through your library . Abstract Ultrahigh-dimensional variable selection plays an increasingly important role in contemporary scientific discoveries and statistical research.
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