Multivariate multistage methodologies for simultaneous all pairwise comparisons

We consider the problem of constructing simultaneous fixed-width confidence intervals for all pairwise treatment differences μ₁−μ _J , in the presence ofk(≥2) independent populationsN _p (μ₁,Σ), 1≤i≠j≤k. Appropriate purely sequential, accelerated sequential and three-stage sampling strategies have been developed and variousfirst-order asymptotic properties are then derived when Σ _pxp is completely unknown, but positive definite (p.d.). In the two special cases when the largest component variance in Σ is a known multiple of one of the variances or Σ=σ² H where σ(>0) is unknown, butH _pxp is known and p.d., the original multistage sampling strategies are specialized. Under such special circumstances, associatedsecond-order characteristics are then developed. It is to be noted that our present formulation and the methodologies fill important voids in the context of multivariate multiple comparisons which is a challenging area that has not yet been fully explored. Moderate sample performances of the proposed techniques were very encouraging and detailed remarks on these were included in Mukhopadhyay and Aoshima (1997).     

An analysis of the trilemma phenomenon for Apple iPhone and Samsung Galaxy

Service Business - Although fast followers have been making huge investments on their expansion strategies to surpass first movers and dominate the market, they have encountered the trilemma of...     

Transfer of System Knowledge Across Generations in New Product Development: Empirical Observations from Japanese Automobile Development

The objective of this article is to explore effective ways of retaining knowledge involved in new product development. Although human–based mechanisms, such as the direct transfer of project members, more effectively convey knowledge required in design integration at the higher level of product systems, the article shows that standardized mechanisms are more appropriate for retention of lower–component knowledge. However, it is also argued that product architecture affects these relationships through its impact on a locus of design change in a product system. Such argument is partially tested in the context of the Japanese automobile industry.