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Pier Francesco Perri

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Editorial of the special issue on survey and data science digital Editorial of the special issue on survey and data science
by Pier Francesco Perri, Emilia Rocco
Year: 2019
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Alcune considerazioni sull’efficienza degli stimatori rapporto-cum-prodotto digital Alcune considerazioni sull’efficienza degli stimatori rapporto-cum-prodotto
by Pier Francesco Perri
Year: 2004
In order to estimate the unknown mean of a study variable using two auxiliary variables, the efficiency of a modified version of the ratio-cum-product estimators is analysed when the sampling fraction is less then 0.5.
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Assessing the Quality of Life of Patients with Epidermolysis Bullosa: Application of the Delphi Method to Develop a Patient-Centred Questionnaire

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