Tests for the mean of a multivariate normal population

We study the problem of testing: H₀ : μ ∈ P against H₁ : μ ? P, based on a random sample of N observations from a p-dimensional normal distribution N_p(μ, Σ) with Σ > 0 and P a closed convex positively homogeneous set. We develop the likelihood-ratio test (LRT) for this problem. We show that the union-intersection principle leads to a test equivalent to the LRT. It also gives a large class of tests which are shown to be admissible by Stein's theorem (1956). Finally, we give the α-level cutoff points for the LRT.     

The Dynamism of Organizational Practices: The Role of Employment Blueprints

This paper explores how founders’ blueprints affect the dynamism of organizational practices, and in particular the capability to sustain as well as change practices. First, a theoretical argument is developed on the critical role of founders’ blueprints of the employment model, which are difficult to alter and mark firms’ future paths by affecting the dynamism of organizational practices over an extended period of time. Subsequently, case studies of several organizational practices in three management consulting firms in the USA, the Netherlands and the UK illustrate how founders’ conceptions of the employment relationship (i.e. their employment model) affect the way in which competing demands of continuity and renewal are addressed. Moreover, engineering‐ or commitment‐oriented blueprints appear to facilitate the capability to adapt, while autocratic blueprints do not.     

Smallpox vaccine policy: the national debate

As a result of the 2001 anthrax attacks, the U.S. government is trying to forge a plan to handle something much worse: an outbreak of smallpox due to terrorist activity. Here's a look at where the debate stands today.     

Act outlines ways to protect health care workers and the public in an emergency

In case of emergency, state public health officials need to be ready and authorized to act. Here's an overview of the Model State Emergency Health Powers Act and the powers it provides.     

More on insurance as a Giffen good

In this article, we generalize the Hoy and Robson (1981) analysis and provide a necessary and sufficient condition for insurance not to be a Giffen good. The condition gives a bound for the variation of absolute risk aversion that permits the wealth effect to be always dominated by the substitution effect.