LectureOct1

LectureOct1 - BME 423 Lecture Notes - Oct. 1, 2008 Methods...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Methods for Proportions and Nominal Variables BME 423 Lecture Notes - Oct. 1, 2008 IV. Contingency Table A. The Idea B. Chi Squared Statistic C. Example D. More than 2x2 E. Example F. Subdividing Contingency Tables z Statistic 32 . 0 19 6 ˆ = = asp p 72 . 0 25 18 ˆ = = pla p
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 z Statistic 32 . 0 19 6 ˆ = = asp p 72 . 0 25 18 ˆ = = pla p 55 . 0 25 19 18 6 ˆ = + + = p () 1 ˆˆ 11 2 2.33 ˆˆ 11 1 asp pla asp pla asp pla pp n n z n n −− + == −+ 0.05 2.33 ( ) 1.96 zt ν => = Reject H0 0.05 P < The Idea Under Null Hypothesis of NO Treatment Effect:
Background image of page 2
3 The Idea Under Null Hypothesis of NO Treatment Effect: 24/44 developed thrombosis (54.5% ) regardless of group 20/44 no thrombosis (45.5% ) regardless of group Expected Thrombosis Formation if Aspirin has NO Effect Sample Group Developed thrombi Free of thrombi Treated Placebo (.545*25) 13.64 (.455*25) 11.36 25 Aspirin (.545*19) 10.36 (.455*19) 8.64 19 Total 24 20 44
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 Expected Thrombosis Formation if Aspirin has NO Effect Sample Group Developed thrombi Free of thrombi Treated Placebo (.545*25) 13.64 (.455*25) 11.36 25 Aspirin (.545*19) 10.36 (.455*19) 8.64 19 Total 24 20 44 () cell in s individual of number ected p ex cell in s individual
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 8

LectureOct1 - BME 423 Lecture Notes - Oct. 1, 2008 Methods...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online