Publications

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2015
Ramos, Luís, João Lita da Silva, and João Tiago Mexia. "On the Strong Consistency of Ridge Estimates." Communications in Statistics -­ Theory and Methods (2015).
2014
Ramos, Luís P., and João Lita da Silva. "On the rate of convergence of uniform approximations for sequences of distribution functions." Journal of the Korean Statistical Society. 43 (2014): 47-65. AbstractWebsite

In this paper, we develop uniform bounds for the sequence of distribution functions of g(Vn+μn), wheregis some smooth function,is a sequence of identically distributed random variables with common distribution having a bounded derivative and {μn} are constants such that μn→∞. These bounds allow us to identify a suitable sequence of random variables which is asymptotically of the same type of g(Vn+μn) showing that the rate of convergence for these uniform approximations depends on the ratio of the second derivative to the first derivative ofg. The corresponding generalization to the multivariate case is also analyzed. An application of our results to the STATIS-ACT method is provided in the final section.

Esquível, Manuel L., João Lita da Silva, João Tiago Mexia, and Luís Ramos. "Rate of Convergence of some Asymptotic Expansions for Distribution Approximations via an Esseen Type Estimate." Communications in Statistics -­ Theory and Methods. 43.2 (2014): 266-290. AbstractWebsite

Some asymptotic expansions not necessarily related to the central limit theorem are studied. We first observe that the smoothing inequality of Esseen implies the proximity, in the Kolmogorov distance sense, of the distributions of the random variables of two random sequences satisfying a sort of general asymptotic relation. We then present several instances of this observation. A first example, partially motivated by the the statistical theory of high precision measurements, is given by a uniform asymptotic approximation to gX + nn∈, where g is some smooth function, X is a random variable and nn∈ is a sequence going to infinity; a multivariate version is also stated and proved. We finally present a second class of examples given by a randomization of the interesting parameter in some classical asymptotic formulas; namely, a generic Laplace’s type integral, randomized by the sequence nXn∈, X being a Gamma distributed random variable.

Ramos, Luís, and João Lita da Silva. "Uniform approximations for distributions of continuous random variables with application in dual STATIS method." REVSTAT. 12.2 (2014): 101-118.
2009
Ramos, Luís, Manuel L. Esquível, João T. Mexia, and João L. Silva. "Some Asymptotic Expansions and Distribution Approximations outside a CLT Context." Proceedings of 6th St. Petersburg Workshop on Simulation. 1. 2009. 444-448. Abstract
Some asymptotic expansions non necessarily related to the central limit theorem are discussed. After observing that the smoothing inequality of Esseen implies the proximity, in the Kolmogorov distance sense, of the distributions of the random variables of two random sequences satisfying a sort of general asymptotic relation, two instances of this observation are presented. A first example, partially motivated by the the statistical theory of high precision measurements, is given by a uniform asymptotic approximation to $(g(X+ μ_n))_{n ın \mathbbm{N}}$, where $g$ is some smooth function, $X$ is a random variable having a moment and a bounded density and $(μ_{n})_{n ın \mathbbm{N}}$ is a sequence going to infinity; the multivariate case as well as the proofs and a complete set of references will be published elsewhere. We next present a second class of examples given by a randomization of the interesting parameter in some classical asymptotic formulas, namely, a generic Laplace's type integral, by the sequence $(μ_n X)_{n ın \mathbbm{N}}$, $X$ being a Gamma distributed random variable. Finally, a simulation study of this last example is presented in order to stress the quality of asymptotic approximations proposed.