A Class of Multivariate Power Skew Symmetric Distributions: Properties and Inference for the Power-Parameter

R. N. Rattihalli ()

Sankhya A: The Indian Journal of Statistics, 2023, vol. 85, issue 2, No 10, 1356-1393

Abstract: Abstract Let SPd be the class of all multivariate sign and permutation invariant densities and SPD be the corresponding class of distribution functions. The class of all distributions corresponding to a positive power of the members of SPD is called the Power Skew Symmetric class of distributions and it is denoted by PSS. We consider the problem of inference associated with the nonnegative power, in the PSS class, with a member of SPD as a nuisance parameter. As the structural forms of the members of PSS are not known, one can’t directly use the sufficiency, invariance, or likelihood function. Hence by using certain properties of the SPD and the PSS classes, we identify maximal statistics whose distributions depend only on the power but not on the members of SPD. We then use the concept of minimal dimensionality for retaining the information about the parameter of interest. We use the minimax criterion, which leads to a statistic having Binomial distribution depending only on the parameter of interest. Hence inferences about the parameter of interest can be carried out using the standard methods for the binomial model. A simulation study indicates that the proposed estimator of the power parameter is asymptotically normal and is insensitive to the nuisance parameter. The proposed method is implemented for the analysis of a data set.

Keywords: Symmetry; Skew symmetry; Nonparametric and semiparametric classes of distributions; MLE; UMP; UMPU tests and simulation.; Primary:60E; Secondary:05 (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1007/s13171-022-00292-5

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