Στρωματοποιημένη Δειγματοληψία (ΣτΔ)

• Κύριοι συγγραφείς: Farmakis, Nikolaos, Φαρμάκης, Νικόλαος
• Μορφή: 7
• Γλώσσα: Greek
• Έκδοση: 2016
• Θέματα: ΔΕΙΓΜΑΤΟΛΗΨΙΑ; ΠΛΗΘΥΣΜΟΣ; ΔΕΙΓΜΑ; ΤΥΧΑΙΑ ΜΕΤΑΒΛΗΤΗ; ΜΕΣΗ ΤΙΜΗ; ΔΙΑΣΠΟΡΑ; ΤΥΠΙΚΗ ΑΠΟΚΛΙΣΗ; ΣΤΡΩΜΑΤΟΠΟΙΗΜΕΝΗ ΔΕΙΓΜΑΤΟΛΗΨΙΑ; ΑΝΑΛΟΓΙΚΗ ΣΤΡΩΜΑΤΟΠΟΙΗΜΕΝΗ ΔΕΙΓΜΑΤΟΛΗΨΙΑ; ΒΕΛΤΙΣΤΗ ΕΠΙΛΟΓΗ ΔΕΙΓΜΑΤΟΣ; ΑΡΙΘΜΗΤΙΚΗ ΕΚΤΙΜΗΤΡΙΑ ΜΕΣΗΑ ΤΙΜΗΣ; ΓΕΩΜΕΤΡΙΚΗ ΕΚΤΙΜΗΤΡΙΑ ΜΕΣΗΣ ΤΙΜΗΣ; Sampling; Simple Random Sampling; Population; Sample; Random Variable; Mean Value; Variance; Standard Deviation; Stratified Sampling; Proportional Stratified Sampling; Optimal Allocation; Arithmetic Estimator Of Mean; Geometric Estimator Of Mean

In the 3rd chapter we deal with the Stratified random sampling (SrS) the most often used sampling technique for surveys. Definitions of basic concepts and the suitable notations are given. We deal with the two kinds of sampling and the suitable estimators: Proportional and optimal allocation. A short part of this chapter is for binary variables, the percentages and their estimations especially in surveys. Also the problem of the size of whole sample and its parts from the population parts (strata) is studied. <br/>Illustrative Examples are given and in some case the problem of optimal allocation is studied. The optimality criteria have to do with a) The cost of the survey and b) the variance of the mean value of the estimators. Some exercises are proposed for solution.