LectureOct1

# LectureOct1 - BME 423 Lecture Notes Oct 1 2008 Methods for...

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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

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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:
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

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

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