\renewcommand{\ttdefault}{cmtt}
\renewcommand{\leq}{\leqslant}
\renewcommand{\geq}{\geqslant}
\renewcommand{\hat}{\widehat}
\newcommand{\twiddle}{$\sim$}

\newcommand{\D}{\mathcal{D}}
\newcommand{\E}{\mathsf{E}}
\newcommand{\F}{\mathcal{F}}
\renewcommand{\Pr}{\mathsf{P}}
\newcommand{\R}{\mathbb{R}}
\newcommand{\boldpi}{\mbox{\boldmath$\pi$}}
\newcommand{\indep}{\perp\kern-0.50em \perp}
\newcommand{\var}{\mathsf{Var}}
\newcommand{\SPLUS}{\textsf{S-PLUS}}
