Ch iii factor analysis + cronbach alpha
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T¨¤i li?u tr¨¬nh b¨¤y v? ph?n t¨ªch nh?n t? EFA v¨¤ ki?m ??nh ?? tin c?y Cronbach's Alpha, bao g?m ??nh ngh?a, ?i?u ki?n ¨¢p d?ng, quy tr¨¬nh th?c hi?n v¨¤ c¨¢c ti¨ºu ch¨ª c?n thi?t ?? ?¨¢nh gi¨¢ ?? tin c?y v¨¤ hi?u l?c c?a c¨¢c nh?n t?. N¨® c?ng ?? c?p ??n vi?c x? l? d? li?u v¨¤ c¨¢ch t¨ªnh to¨¢n c¨¢c nh?n s? t? c¨¢c nh?n t? ???c x¨¢c ??nh. Cu?i c¨´ng, t¨¤i li?u x¨¢c nh?n t¨ªnh h?p l? v¨¤ gi¨¢ tr? c?a d? li?u khi th?c hi?n c¨¢c ph?n t¨ªch n¨¤y.
Ch iii factor analysis + cronbach alpha
- 1. PH?N T?CH NH?N T? EXPLORE FACTOR ANALYSIS (EFA) V? KI?M ??NH CRONBACH ALPHA TS. L? V?N HUY Email: levanhuy@vnn.vn Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 2. N?I DUNG CH?NH ??nh ngh?a ?i?u ki?n ?ng d?ng Nghi¨ºn c?u c¨¢c nh?n t? S? c¨¢c nh?n t? ph?i t¨¢ch ra Ph¨¦p quay (rotation) ?i?m s? nh?n t? (Factorial Scores) ?? tin c?y v¨¤ hi?u l?c (Reliability and Validity) Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 3. ??NH NGH?A Ph?n t¨ªch nh?n t? b?ng c¨¢c th¨¤nh ph?n ch¨ªnh (principal components) cho ph¨¦p r¨²t g?n nhi?u bi?n s? (variables ho?c items) ¨ªt nhi?u c¨® m?t li¨ºn t??ng quan l?n nhau th¨¤nh nh?ng ??i l??ng ???c th? hi?n d??i d?ng m?i t??ng quan theo ???ng th?ng ???c g?i l¨¤ nh?ng nh?n t? (factors) Ch¨² ?: t? ??y c¨® th? hi?n c¨¢c bi?n l¨¤ c¨¢c items Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 4. M? H?NH NH?N T? Gi? s? ph?n t¨ªch nh?n t? r¨²t ra ???c i nh?n t? (factors), ta c¨®: Fi = Wi1X1 + Wi2X2 + Wi3X3 + ¡. + WinXn V?i Fi l¨¤ ??c l??ng tr? s? c?a nh?n t? (factor) th? i. Wik l¨¤ quy?n s? hay tr?ng s? nh?n t? (weight or factor score coefficient) c?a bi?n s? th? k ??n nh?n t? i. k: S? bi?n (items) Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 5. ??NH NGH?A PH?N T?CH NH?N T? R¨²t g?n s? bi?n ??u ti¨ºn l¨¤ x¨¢c ??nh c¨¢c chi?u (dimension) kh¨¢c nhau sau ?¨®, gi?i s? li¨ºn quan c?a m?i bi?n (variable, items) v?i c¨¢c nh?n t? (factors) t¨´y theo t¨¬nh h¨¬nh m¨¤ gi?m s? l??ng c¨¢c bi?n Ch¨² ? Kh?ng c¨® bi?n ??c l?p v¨¤ bi?n ph? thu?c, c¨¢c bi?n c¨® c¨´ng m?t t¨¬nh tr?ng (c¨´ng thang ?o) Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 6. K?CH TH??C M?U T?i thi?u l¨¤ 50 quan s¨¢t v¨¤ t?t h?n l¨¤ l?n h?n 100 S? quan s¨¢t s? ?nh h??ng ??n vi?c l?a ch?n c¨¢c ti¨ºu chu?n trong ph?n t¨ªch nh?n t?. Qui t?c kinh nghi?m: s? quan s¨¢t l?n h?n (¨ªt nh?t) 5 l?n s? bi?n (items) Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 7. V? D? THANG ?I?M LIKERT Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 8. L? THUY?T KHOA H?C L? thuy?t khoa h?c L¨¤ h? th?ng lu?n ?i?m v? m?i li¨ºn h? gi?a c¨¢c s? ki?n khoa h?c G?m: H? th?ng kh¨¢i ni?m C¨¢c m?i li¨ºn h? Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 9. S? L??C V? KH?I NI?M Kh¨¢i ni?m l¨¤ c?ng c? ?? g?i t¨ºn m?t s? ki?n khoa h?c, ?? t? duy v¨¤ trao ??i th?ng tin, l¨¤ c? s? ?? nh?n d?ng b?n ch?t c?a m?t s? v?t Kh¨¢i ni?m g?m 2 b? ph?n h?p th¨¤nh N?i h¨¤m l¨¤ t?t c? c¨¢c thu?c t¨ªnh b?n ch?t c?a s? ki?n Ngo?i di?n l¨¤ t?t c? c¨¢c c¨¢ th? c¨® ch?a thu?c t¨ªnh ch? trong n?i h¨¤m V¨ª d?: Khoa h?c N?i h¨¤m l¨¤ h? th?ng tr¨ª th?c v? b?n ch?t s? v?t Ngo?i di?n l¨¤ c¨¢c lo?i khoa h?c: khoa h?c t? nhi¨ºn, x? h?i, k? thu?t¡ Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 10. TH?NH PH?N C?A L? THUY?T KHOA H?C Kh? n?ng suy r?ng C¨¢c gi?i h?n trong nghi¨ºn c?u: gi¨¢ tr?, th?i gian v¨¤ kh?ng gian Kh¨¢i ni?m nghi¨ºn c?u Bi?n quan s¨¢t Gi? thuy?t l? thuy?t Gi? thuy?t ki?m ??nh gi? thuy?t Kh¨¢i ni?m nghi¨ºn c?u Bi?n quan s¨¢t Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 11. M? H?NH NGHI?N C?U V? C?C KH?I NI?M Items 1.1 Items 1.2 Items 1.3 ¡ Items 1.n L?NH ??O C? H?I ?T?O V? TTI?N L??NG, TH??NG Items 2.1 Items 2.2 Items 2.3 ¡ Items 2.n ??NG NGHI?P S? TRUNG TH?NH PH?C L?I B?N CH?T CVI?C M?I TR??NG LV Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 12. PH?N T?CH NH?N T? Analyze Data Reduction Factor Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 13. PH?N T?CH NH?N T? Ch?n t?t c? c¨¢c bi?n c?n ph?n t¨ªch nh?n t? v¨¤o ? Variables v¨¤o nh? h¨¬nh v? Nh?n v¨¤o Descriptives Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 14. PH?N T?CH NH?N T? Ch?n Antiimage v¨¤ KMO Ph??ng ph¨¢p: Principal Components Ti¨ºu chu?n: Eigenvalues>=1 ho?c C? ??nh s? nh?n t? Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 15. PH?N T?CH NH?N T? Xoay Varimax L?u l?i nh?n s? X¨®a c¨¢c tr?ng s? <0,5 c?a c¨¢c bi?n v?i c¨¢c nh?n t? Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 16. B1. KI?M TRA ?I?U KI?N PH?N T?CH NH?N T? ?K1: KMO > 0,5 (Hair v¨¤ c?ng s?, 2006) ?K2: Sig. (Bartlett¡¯s Test) < 0,05 (Hair v¨¤ c?ng s?, 2006) C?u h?i: N?u KMO <0,5 ho?c Sig. (Bartlett¡¯s Test) > 0,05 th¨¬ gi?i quy?t th? n¨¤o? B? items c¨® gi¨¢ tr? tr¨ºn ???ng ch¨¦o c?a Anti-image Matrices < 0,3 Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 17. B2. X?C ??NH S? L??NG NH?N T? V?n ?? 1: T??ng ?ng v?i vi?c ch?n Eigenvalues > 1 + Ph??ng sai tr¨ªch > 0,5 (50%) + Eigenvalues > 1 (Gerbing v¨¤ Anderson, 1988) V?n ?? 2: Ch?n s? l??ng nh?n t? c? ??nh tr??c Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 18. Th?ng tin t? bi?u Rotated Component Matrix B? c¨¢c items c¨® gi¨¢ tr? <0,5 (Hair v¨¤ c?ng s?, 2006) B? c¨¢c items c¨® gi¨¢ tr? <0,5 Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 19. B? c¨¢c items c¨® gi¨¢ tr? <0,5 MT3, MT4 Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 20. K?t qu? ph?n t¨ªch sau khi ?? lo?i c¨¢c items MT3, MT4 Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 21. ??t t¨ºn c?a c¨¢c Factors (t? 1 ??n 7) Khi ??t t¨ºn: N¨ºn ??i chi?u v?i c¨¢c bi?n ti?m ?n trong ph?n m? h¨¬nh l? thuy?t Khi ??t t¨ºn: - F1: L?nh ??o - F2: C? h?i ?¨¤o t?o v¨¤ th?ng ti?n - F3: L??ng, th??ng - F4: ??ng nghi?p - F5: Ph¨²c l?i - F6: Ban ch?t CV - F7: M?i tr??ng LV Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 22. C?U H?I 1 H?y k?t lu?n F1: C? h?i ?¨¤o t?o v¨¤ th?ng ti?n F1 = Mean (?T2, ?T3, ?T4, ?T5, ?T6, ?T7) F2: L?nh ??o F3: L??ng, th??ng F4: ??ng nghi?p F5: Ph¨²c l?i F6: Ban ch?t CV F7: M?i tr??ng LV ???c t?o th¨¤nh t? c¨¢c items n¨¤o? Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 23. K?T Lu?N 1 Ph??ng sai tr¨ªch Eigenvalues cumulative % = 67,55% Nh? v?y, 67,55% bi?n thi¨ºn c?a d? li?u ???c gi?i th¨ªch b?i 7 nh?n t? M?c ? ngh?a ki?m ??nh Barlett = 0,000 <0,05 C¨¢c bi?n quan s¨¢t c¨® t??ng quan v?i nhau tr¨ºn t?ng th? KMO = 0,863 D? li?u ph¨´ h?p ?? th?c hi?n ph?n t¨ªch nh?n t? Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 24. C?U H?I 2 C¨¢c b?n h?y th?c hi?n t??ng t? v?i bi?n ti?m ?n LTT Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 25. T?NH C?CH NH?N S? Nh?n s? b?ng trung b¨¬nh c?ng c?a c¨¢c bi?n s? (ho?c items) c?a t?ng Factors F1: C? h?i ?¨¤o t?o v¨¤ th?ng ti?n F1 = Mean (?T2, ?T3, ?T4, ?T5, ?T6, ?T7) Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 26. T?NH C?CH NH?N S? Trung b¨¬nh c?a c¨¢c bi?n (items) Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 27. T?NH C?CH NH?N S? Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 28. NH?N X?T !!! D? li?u ?? c¨® gi¨¢ tr?? D? li?u ?? c¨® ?? tin c?y? C?n th?c hi?n ki?m ??nh Cronbach Alpha Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 29. KI?M ??NH CRONBACH ALPHA Analyze Scale Reliability Analysis Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 30. KI?M ??NH CRONBACH ALPHA - Ch?n c¨¢c bi?n (items) bi?u hi?n F1 v¨¤o ph?n t¨ªch - Nh?n Statistics Ch?n c¨¢c t¨´y ch?n nh? h¨¬nh v? Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 31. K?T QU? ?i?u ki?n: Cronbach Alpha >=0,6 nh?ng t?t nh?t l¨¤ l?n h?n 0,7 (Nunnally v¨¤ Burnstein, 1994) Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 32. C?U H?I N?u Cronbach Alpha <0,6 th¨¬ x? l? th? n¨¤o? C?n ki?m tra lo?i items n¨¤o ?? cho Cronbach Alpha l?n h?n 0,6 Th?ng tin xem trong Cronbach's Alpha if Item Deleted Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 33. GI? S? Cronbach Alpha = 0,465 <0,6 n¨ºn kh?ng th?a ?i?u ki?n Alpha >= (Nunnally v¨¤ Burnstein, 1994) N¨ºn b? items ?T2 ?? Cronbach Alpha t?ng c¨® gi¨¢ tr? l¨¤ 0,86 (b?ng ch¨ªnh gi¨¢ tr? Alpha c?a items delect) Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 34. B? ITEMS ?T2 K?T QU? S? L?: K?t lu?n: Th?a ?i?u ki?n Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 35. K?T LU?N C¨¢c nh?n s? c?a c¨¢c nh?n t? d¨´ng ?? t¨ªnh to¨¢n ch? ???c h¨¬nh th¨¤nh sau khi ki?m tra EFA v¨¤ Cronbach Alpha (th?a m?n c¨¢c ?i?u ki?n) V?y, c¨¢c nh?n t? Fi ???c t¨ªnh nh? th? n¨¤o F1: C? h?i ?¨¤o t?o v¨¤ th?ng ti?n F2: L?nh ??o F3: L??ng, th??ng F4: ??ng nghi?p F5: Ph¨²c l?i F6: Ban ch?t CV F7: M?i tr??ng LV Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 36. THANG ?O ??N H??NG V? ?A H??NG Kh¨¢i ni?m c¨® th? ch? g?m m?t y?u t? / th¨¤nh ph?n v¨¤ thang ?o kh¨¢i ni?m ch? c¨® m?t th¨¤nh ph?n g?i l¨¤ thang ?o ??n h??ng (unidimensional) Kh¨¢i ni?m c¨® th? g?m nhi?u y?u t? / th¨¤nh ph?n v¨¤ thang ?o kh¨¢i ni?m c¨® nhi?u th¨¤nh ph?n g?i l¨¤ thang ?o ?a h??ng (multiunidimensional) Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics
- 37. C?U H?I Trong ph?n h?p tuy?n l? thuy?t, nghi¨ºn c?u k?t lu?n m? h¨¬nh g?m 7 nh?n t? t¨¢c ??ng ??n s? h¨¤i l¨°ng c?a nh?n vi¨ºn? N?u trong ph?n t¨ªch EFA ta th?y c¨® 8 factors (nh?n t?, th¨¤nh ph?n) Gi?i quy?t th? n¨¤o? K?t lu?n: T?n t?i m?t thang ?o ?a h??ng v¨¤ c?n ?i?u ch?nh m? h¨¬nh? Copyright @ 2009, L? V?N HUY, PhD., Danang University of Economics