This paper presents a proposal based on an evolutionary algorithm to impute missing observations in multivariate data. A genetic algorithm based on the minimization of an error function derived from their covariance matrix ...

A method for Mo solid phase extraction on l-tyrosine immobilized on carbon nanotubes (l-tyr-CNTs) is presented. l-tyr-CNTs were used to fill a minicolumn and introduced into a FI system employing inductively coupled plasma ...

The financial market presents non-linearities for the behavior of stock returns for periods of high and low market. This article studies portfolios whose variance-covariance matrices are estimates using a multivariate model ...

This work presents a simple and sensitive flow injection fluorimetric methodfor the determination of carbamazepine (CBZ) in pharmaceutical samples. Itis based on the fluorescence signal measurement of the product generated ...