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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)

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Day 5

Day 5

Proportions

and

Sample Size


Motivating question
Motivating Question

  • What factors are associated with mortality?

    • ICU characteristics

    • patient characteristics

    • complications

    • comorbid diseases


Confidence intervals
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
Binomial Test

  • Fisher’s exact test

  • 2 test

    tab

    cc

    cs


Fisher s exact test
Fisher’s exact test

  • tab death ruptured, exact col

  • cs death ruptured, exact col


Fisher s exact test1
Fisher’s exact test

  • gen diabetes=cond(mdmR==1 |sdmR==1,1,0)

  • tab death diabetes, exact col

  • cs death diabetes, exact


2 test
2test

  • tab death reintub, chi col

  • tab death reintub, chi exact col


Sample size
Sample Size

  • Comparing 2 means

    • sampsi m1 m2, sd1(s1) sd2(s2)

    • sampsi m1 m2, sd1(s)

  • Comparing 2 proportions

    • sampsi p1 p2

  • Options

    • power

    • alpha


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