RRmn1: Relative Risk and Score CI of two groups without strata by MN method

Description

Relative risk and its score confidence interval of two groups without stratification

Usage

RRmn1(y1, n1, y2, n2, conf.level=0.95, eps=1e-8)

Value

The result is a data.frame. There is no standard error.

p1: proportion from the first group, y1/n1
p2: proportion from the second group, y2/n2
RR: relative risk, p1/p2
lower: lower confidence limit of RR
upper: upper confidence limit of RR

Arguments

y1: positive event count of test (the first) group
n1: total count of the test (the first) group
y2: positive event count of control (the second) group
n2: total count of control (the second) group
conf.level: confidence level
eps: absolute value less than eps is regarded as negligible

Author

Kyun-Seop Bae k@acr.kr

Details

It calculates relative risk and its score confidence interval of two groups. The confidence interval is asymmetric and there is no standard error in the output. This does not support stratification. This implementation uses nlminb minimization function which usually gives about 7 significant digits. PropCIs::riskscoreci function uses cubic equation approximation which gives only about 2 siginicant digits.

References

Miettinen O, Nurminen M. Comparative analysis of two rates. Stat Med 1985;4:213-26

Examples

Run this code

  RRmn1(104, 11037, 189, 11034)

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