the hotelling's  control chart, is the most widely used multivariate procedure for monitoring  two or more related quality characteristics, but it’s power lacks the desired performance in detecting small to moderate shifts. recently, the variable sampling intervals (vsi) control scheme in which the length of successive sampling intervals is determined upon the preceding values has been pro...

We consider noise in computed tomography images that are reconstructed using the classical direct fan-beam filtered backprojection algorithm, from both fulland short-scan data. A new, accurate method for computing image covariance is presented. The utility of the new covariance method is demonstrated by its application to the implementation of a channelized Hotelling observer for a lesion detec...

This paper re-examines the Hotelling model of optimal nonrenewable resource extraction in light of stock effects and technological progress. We assume functional forms for cost and demand so that the solution to the Hotelling problem is a steady-state consistent with the empirical observation that the growth rates of market prices have remained zero over a long period of time. We use data on 14...

Step-down testing procedures for the Hotelling T2 problem are considered. We show that the step-down procedure proposed by S.N. Roy, R.E. Bargmann, and J. Roy is inadmissibleamonginvariantprocedures (for a suitable invariance group) in many situatiqns, includiItgallthosefor which more than two steps are contemplated. We also show that in most cases, the power of the step-down procedure decrease...

In this paper we expand the standard Hotelling-Downs model (Hotelling 1929; Downs 1957) of spatial competition to a setting where clients do not necessarily choose their closest candidate (retail product or political). Specifically, we consider a setting where clients may disavow all candidates if there is no candidate that is sufficiently close to the client preferences. Moreover, if there are...

The present paper reviews the literature on the empirical implications of the Hotelling rule and suggests directions for further research in this area.

We investigate a mixed duopoly market where a welfare−maximizing public firm competes against a profit−maximizing private firm, using a linear−city location−then−price model with linear transportation costs. We find that, compared with the results in the purely private duopoly case discussed by Hotelling (1929) and d' Aspremont, Gabszewicz, and Thisse (1979), the condition under which price equ...