Page 130 - สถิติทางวิทยาศาสตร์สุขภาพ เพื่อการวิจัย

«‘∏’°“√§”π«≥§à“ P value ∑”‚¥¬‡æ‘Ë¡À√◊Õ≈¥§à“ a ‰ª‡√◊ËÕ¬Ê ∂â“æ∫«à“¡’°“√
‡ª≈’ˬπ·ª≈ߢÕߺ≈√«¡„π·∂«À√◊Õ„π ¥¡¿å°Á®–À¬ÿ¥ ®“°¢âÕ¡Ÿ≈§”π«≥§à“ p ¢Õß·µà≈–
µ“√“߉¥â¥—ßπ’È

µ“√“ß∑’Ë 1

0 9 911 416!! ! !
p = = 0.06811
1
!! ! !
4 7 0947 20!

µ“√“ß∑’Ë 2 ‰¥â®“°°“√ —߇°µ

1 8 9
911 416!! ! !
3 8 11 p = = 0.30650
2
18 3 8 20!!!! !
4 16 20

µ“√“ß∑’Ë 3

2 7 911 416!! ! !
p = = 0.40867
3
2 9 27 29 20!!! ! !

µ“√“ß∑’Ë 4

3 6 911 416!! ! !
p = = 0.19071
4
1 10 361 10 20!! ! ! !

µ“√“ß∑’Ë 5

4 5 911 416!! ! !
p = = 0.02601
5
0 11 45 0 11 20!! ! ! !

°“√§”π«≥§à“ P value °√≥’°“√∑¥ Õ∫¥â“π‡¥’¬«®–√«¡§à“ p ®“°µ“√“ß∑’Ë

—߇°µ‰¥â∂÷ßµ“√“ß ÿ¥∑⓬ª≈“¬¥â“π„¥¥â“πÀπ÷Ëßµ“¡ H ∑’˵—È߉«â«à“¡“°°«à“À√◊ÕπâÕ¬°«à“ ‡™àπ
A
∂⓵âÕß°“√∑√“∫«à“ºŸâ∑’Ë«‘ËßÕÕ°°”≈—ß°“¬‡ªìπª√–®”®–‡ªìπ‚√§§«“¡¥—π‚≈À‘µ ŸßπâÕ¬°«à“À√◊Õ‰¡à
§à“ P value ®–‰¥â®“°°“√√«¡§à“ p µ—Èß·µàµ“√“ß 2 ´÷Ë߉¥â®“°°“√ —߇°µ·≈–¡’ºŸâªÉ«¬„π°≈ÿà¡
ºŸâ∑’Ë«‘ËßÕÕ°°”≈—ß°“¬ 1 §π °—∫µ“√“ß 1 ´÷Ëß¡’ºŸâªÉ«¬„π°≈ÿà¡«‘ËßÕÕ°°”≈—ß°“¬ 0 §π

P value = p + p = 0.30650 + 0.06811
2 1
= 0.37461

7.2 °“√∑¥ Õ∫§«“¡ —¡æ—π∏å√–À«à“ßµ—«·ª√∑’ˇªìπ¢âÕ¡Ÿ≈°≈ÿà¡ 129

∫∑∑’Ë 7 129 29/7/09, 4:10 PM