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2. ; ; ( )www.cears.edu.gr2 3. , , , . , www.cears.edu.gr3 4. , , , ;www.cears.edu.gr4 5. (Sampling) . : .. , : 50+www.cears.edu.gr5 6. (Sampling) . www.cears.edu.gr6 7. (Sampling) ( )www.cears.edu.gr7 8. (Random Sampling) (.. ) (Systematic Sampling) www.cears.edu.gr8 9. (Stratified Random Sampling) - . : , , .. - - . www.cears.edu.gr9 10. : (Personal Interview) T (Self-AdministeredQuestionnaires) www.cears.edu.gr10 11. : 1. 2. .. 3. www.cears.edu.gr11 12. : . 20%. . (. 5000 1000 ) www.cears.edu.gr12 13. . , www.cears.edu.gr13 14. : www.cears.edu.gr14 15. : ( , ) ( bias)www.cears.edu.gr15 16. : (, ) www.cears.edu.gr16 17. : (nonresponse rate) (response bias)www.cears.edu.gr17 18. : ( - ) www.cears.edu.gr18 19. : (non-response rate) , (response bias)www.cears.edu.gr19 20. !www.cears.edu.gr20 21. : ; ; www.cears.edu.gr21 22. ; , .. , ; ; , , ; ; www.cears.edu.gr22 23. ; ; . (.. , , .. .); 2001, 8,2% 50+ 15.9% . www.cears.edu.gr23 24. ; ; ;www.cears.edu.gr24 25. ; ; .. , . . ; , www.cears.edu.gr25 26. ; ; ;www.cears.edu.gr26 27. : ; (screening of respondents) www.cears.edu.gr27 28. .. www.cears.edu.gr28 29. ; ; www.cears.edu.gr29 30. ; . ! ; www.cears.edu.gr30 31. (interviewer bias); , ; ;www.cears.edu.gr31 32. , , : (.. , - ) . , www.cears.edu.gr32 33. : 1. 2. 3. www.cears.edu.gr33 34. . .www.cears.edu.gr34 35. .. , : (screening questions eligible respondents): , , www.cears.edu.gr35 36. : : ; ; , , , , , , , ... www.cears.edu.gr36 37. (): ; , , , , , , , www.cears.edu.gr37 38. (screening) . www.cears.edu.gr38 39. , , www.cears.edu.gr39 40. : .. : / ;www.cears.edu.gr40 41. : ( ) , www.cears.edu.gr41 42. .. ; ; ( 0-1) www.cears.edu.gr42 43. Ranked .. ( ) / / www.cears.edu.gr43 44. Rated Responses : ( (5) - (4) - (3) (2) (1)) 1 5 www.cears.edu.gr44 45. 1. : - : .. ; ( - )www.cears.edu.gr45 46. ( ) .. ; ( )www.cears.edu.gr46 47. 2. , ; 15-34, 35-54, 55+www.cears.edu.gr47 48. 3. .. ;www.cears.edu.gr48