Page 255 - สถิติทางวิทยาศาสตร์สุขภาพ เพื่อการวิจัย

™“«∫â“π ≈”¥—∫∑’Ë Õ ¡. ≈”¥—∫∑’Ë ‡®â“Àπâ“∑’Ë ≈”¥—∫∑’Ë
2 3.5 5 7.5 9 14

3 5.5 3 5.5 10 15
1 2 7 12 7 12
0 1 6 9.5 6 9.5

2 3.5 5 7.5 7 12
T = 15.5 T = 42 T = 62.5
1 2 3
n = 5 n = 5 n = 5
2
3
1
π”§à“ T ·≈– n ®“°∑’˧”π«≥‰¥â·∑π§à“≈ß„π Ÿµ√§”π«≥§à“ H ‰¥â¥—ßπ’È
i i
2
12 T i
H= ë Â í - 3(N + 1)
NN( + 1) n i

2 2 2
12 15 5. 42 62 5.
= ë + + í - 3(15 + 1)
15 15( + 1) 5 5 5
= 11.10

2
Û
∂‘µ‘ H ¡’°“√·®°·®ß‰§ ·§«√å ( ) ∑’ËÕß»“‡ √’ k - 1 = 3 - 1 = 2 π”§à“
2
c = 11.10 ‰ª‡ªî¥µ“√“ßÀ“§à“§«“¡πà“®–‡ªì𠉥â§à“§«“¡πà“®–‡ªìπ P value < 0.005
()2
´÷Ëß¡’§à“πâÕ¬°«à“§à“ Ò (0.05) º≈°“√∑¥ Õ∫ªØ‘‡ ∏ ¡¡µ‘∞“π· ¥ß«à“™“«∫â“π Õ ¡.
·≈–‡®â“Àπâ“∑’Ë¡’Õ¬à“ßπâÕ¬ 1 §Ÿà ∑’Ë¡’§«“¡·µ°µà“ß°—πÕ¬à“ß¡’π—¬ ”§—≠

°“√‡ª√’¬∫‡∑’¬∫√–À«à“ߧŸà¥â«¬«‘∏’°“√·∫∫¥—ππå¡’ Ÿµ√§”π«≥¥—ßπ’È

R - R
i j
Z=
È ˘
NN + )1 Í 1 1 ˙
(
+
12 Í Î Í n i n j ˙ ˙
˚
‚¥¬∑’Ë |R - R| = º≈µà“ß —¡∫Ÿ√≥å¢Õß§à“µ”·Àπà߇©≈’ˬ¢Õß°≈ÿà¡∑’Ë i °—∫ j
i j
N= ®”π«πµ—«Õ¬à“ß∑—ÈßÀ¡¥
n ·≈– n = ®”π«πµ—«Õ¬à“ߢÕß°≈ÿà¡ i ·≈– j
i j
a
°“√µ—¥ ‘π„Àâπ”§à“ P value ¡“‡∑’¬∫°—∫ Ò* =
kk( - 1 )

254 ∫∑∑’Ë 18 ∂‘µ‘·∫∫‰¡à„™âæ“√“¡‘‡µÕ√å

∫∑∑’Ë18 254 3/8/09, 9:09 AM