Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...
Marguerita is a Certified Financial Planner (CFP), Chartered Retirement Planning Counselor (CRPC), Retirement Income Certified Professional (RICP), and a Chartered Socially Responsible Investing ...
In longitudinal data analysis, a correct specification of the within-subject covariance matrix cultivates an efficient estimation for mean regression coefficients. In this article, we consider robust ...
Regularization of covariance matrices in high dimensions usually either is based on a known ordering of variables or ignores the ordering entirely. This article proposes a method for discovering ...
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