Proportions and Sample Size

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Presentation transcript:

Proportions and Sample Size Day 5 Proportions and Sample Size

Motivating Question What factors are associated with mortality? ICU characteristics patient characteristics complications comorbid diseases

Confidence Intervals ci death, bi ci death, bi by(phys) ci death, bi by(npnight) ci death, by(nonwhite) bi ci death, by(reint) bi

Binomial Test Fisher’s exact test 2 test tab cc cs

Fisher’s exact test tab death ruptured, exact col cs death ruptured, exact col

Fisher’s exact test tab death diabetes, exact col gen diabetes=cond(mdmR==1 |sdmR==1,1,0) tab death diabetes, exact col cs death diabetes, exact

2 test tab death reintub, chi col tab death reintub, chi exact col

Sample Size Comparing 2 means Comparing 2 proportions Options sampsi m1 m2, sd1(s1) sd2(s2) sampsi m1 m2, sd1(s) Comparing 2 proportions sampsi p1 p2 Options power alpha