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#1
07-15-2012
 USMLE Forums Master Steps History: 1+CK+CS Posts: 1,867 Threads: 149 Thanked 2,106 Times in 1,049 Posts Reputation: 2126
Natural log of the sample risk!

To carry out hypothesis tests or to compute confidence intervals for risk and odds ratios, we use the natural log of the sample risk or odds ratio in place of their actual values. We do this because:

a. The sampling distributions of risk and odds ratios are approximately normally distributed.
b. The sampling distributions of the natural log of risk and odds ratios are approximately normally distributed.
c. It increases the power to find significant risk and odds ratios.
d. It reduces the size of confidence intervals for any given level of significance.

#2
07-15-2012
 USMLE Forums Master Steps History: 1+CK+CS Posts: 646 Threads: 52 Thanked 762 Times in 256 Posts Reputation: 773

c. It increases the power to find significant risk and odds ratios.

 Tags Biostatistics-Epidemiology, Step-2-Questions

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