Un metodo alternativo per la selezione delle variabili nella calibrazione
The main national institutes of statistics use calibration estimator (Deville e Särndal, 1992; Särndal, 2007). During the years the numbers of auxiliary totals considered in calibration is strongly increased. Because of this, two main problems arise. Very often there is failure to identify "calibrated" weights and, furthermore, the variability of “calibrated” weights can make the efficiency of estimates worse. Therefore, the choice of auxiliary variables in calibration is of a greatest importance.