Confidence Interval of a Difference Between Proportions ºñ·Ê°£ Â÷ÀÌ¿¡ ´ëÇÑ ½Å·Ú±¸°£

Difference = (A / N) - (C / M)
Interval = Z * sqr( (A*(N-A)/power(N,3)) + (C*(M-C)/power(M,3)) )
LowerEnd = Difference - Interval
UpperEnd = Difference + Interval

ÀԷ°ª:

A
N
C
M
Z 90% Confidence (1.645)

95% Confidence (1.96)

98% Confidence (2.33)

99% Confidence (2.576)

°á°ú°ª:

Difference
Interval
LowerEnd
UpperEnd
 
Decimal Precision:

Examples of application: Calculations of Absolute Risk Reduction, etc . . .


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Internet Site: SAS Online Doc, Version 8, Cary, NC, SAS Institute, 1999 (free registration for password), http://v8doc.sas.com/sashtml/

 


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