New characterizations of the dispersive ordering are established. These include a characterization in terms of the stochastic ordering of the sample spacings, preservation of the ordering by monotone convex (concave) transformations, and preservation of the ordering by truncation at the same...

An important aspect of microarray studies involves the prediction of patient survival based on their gene expression levels. To cope with the high dimensionality of the microarray gene expression data, it is customary to first reduce the dimension of the gene expression data via dimension...

Situations occur frequently in which the mean residual life (mrl) functions of two populations must be ordered. For example, if a mechanical device is improved, the mrl function for the improved device should not be less than that of the original device. Also, mrl functions for medical patients...

The concept of tail-heaviness of a distribution function is prominent in both the theory and applications of statistics. Recently Rojo (1992), considered the q-ordering and D-ordering, whose attention is focused in making comparisons on the tails of the distributions. Here, the preservation of...

The problem of testing the hypothesis that two distributions are identical except for an unknown location parameter against the alternative that one is less dispersed than the other is considered here. It is seen that various tests proposed in the literature can be unified under the present...

Some new results are obtained on stochastic orderings between random vectors of spacings from heterogeneous exponential distributions and homogeneous ones. LetD1, ..., Dnbe the normalized spacings associated with independent exponential random variablesX1, ...,Xn, whereXihas hazard...

The class of distributions F which are uniformly stochastically smaller than a known standard G arises naturally when life testing experiments are conducted in an environment more severe or stressful than the environment in which the system has been pretested. The problem of estimating a...

In this paper, a practical application of a valuation method that decouples the time value of money from the risk associated with the project is used to value an investment on a solar project. The proposed method is termed decoupled net present value (DNPV). A simple investment renewable energy...