In this context, supposing a sampling survey framework and a model-based approach, the attention has been focused on the main features of the optimal prediction strategy for a population mean, which implies knowledge of some model parameters and functions, normally unknown. In particular, a...

In the frame of a statistical survey, the identification of non respondent units that should be object with priority of a reminder action (Intensive Follow Up - IFU), with the aim to produce enough good estimates, represents a relevant, but quite not deeply analysed methodological aspect. In...

The Hulliger’s robust estimation technique consists in the re-weighting of units identified as outliers through a Robustified Ratio Estimator (RRE), according to which outliers Improving robust ratio estimation in longitudinal surveys with outlier observations 17 contribute to the final...

Il turismo è un fenomeno fortemente localizzato. Le caratteristiche del territorio ne denotano strutturalmente il profilo e i molteplici modelli di offerta cercano di soddisfare la variabilità dei gusti e delle esigenze dei visitatori. Sulla base della rilevazione ISTAT sul movimento nelle...

When carrying out statistical surveys, detecting non-respondent units to undergo Intensive Follow Up (IFU) to disseminate quality estimates represents an important though under estimated aspect that is often not deeply studied. We suggest to use a generalised score function to quantify the risk...

Timeliness is a driving feature of official statistics. In particular, in the short-term statistics framework usually a first provisional release is carried out on the basis of preliminary early respondents, followed by a final release based on late respondents as well. The revision is the...

Il lavoro propone una selezione organica di dati statistici relativi agli spostamenti internazionali di viaggiatori da e verso stati aderenti all’Unione Europea, derivata dalla fonte EUROSTAT. Con riferimento al periodo 1995-2010 e ad aspetti quali la propensione turistica, il grado...