riskratio: Calculate risk ratio and its confidence intervals
Description
Calculate risk ratio (a kind of relative risk) and its
confidence intervals based on approximation, followed by
null hypothesis (risk ratio equals to 1) testing.
Usage
riskratio(X, Y, m1, m2, conf.level=0.95, p.calc.by.independence=TRUE)
Value
estimate
Calculated point estimate of risk ratio.
conf.int
A numeric vector of length 2 to give upper/lower limit of confidence intervals.
p.value
The significant probability of the result of null-hypothesis testing.
Arguments
X
The number of disease occurence among exposed cohort.
Y
The number of disease occurence among non-exposed cohort.
m1
The number of individuals in exposed cohort group.
m2
The number of individuals in non-exposed cohort group.
conf.level
Probability for confidence intervals. Default is 0.95.
p.calc.by.independence
Logical. If TRUE, calculating p-value by
testing the null-hypothesis of independence between exposure and disease.
Otherwise, calculating p-value by inverse-function of confidence intervals
calculation (the result becomes the same as the vcd package). Default TRUE.