Employer use of employee drug-screening procedures is widespread in the U.S. A state-by-state analysis of statutory law applicable to the drug testing issue is combined with state and industry data to isolate how drug testing laws affect workplace injury rates. Based on our data, injury rates...

Univariate cubic L 1 splines provide C 1 -smooth, shape-preserving interpolation of arbitrary data, including data with abrupt changes in spacing and magnitude. The minimization principle for univariate cubic L 1 splines results in a nondifferentiable convex optimization problem. In order to...

Univariate cubic L <Subscript>1</Subscript> splines provide C <Superscript>1</Superscript>-smooth, shape-preserving interpolation of arbitrary data, including data with abrupt changes in spacing and magnitude. The minimization principle for univariate cubic L <Subscript>1</Subscript> splines results in a nondifferentiable convex optimization problem. In order to...</subscript></superscript></subscript>