Strategia di campionamento per l’indagine sulla valutazione dei corsi di formazione professionale

This paper describes the problems to be solved in a survey aimed at evaluating the professional training courses and the sample designs adopted in evaluating the courses of three-year period (2000, 2001, 2002) in Emilia-Romagna. Specifically, it illustrates the determination of the sampling size, the territorial stratification, the selection of sampling units, the calculation of weights, the variance of estimators, the key-points of an income longitudinal survey, some indicators of total and partial nonresponses.