rateratio: Calculate incidence rate ratio and its confidence intervals
Description
Calculate incidence rate ratio (a kind of relative risk) and its
confidence intervals based on approximation, followed by
null hypothesis (incidence rate ratio equals to 1) testing.
Usage
rateratio(a, b, PT1, PT0, conf.level=0.95)
Value
estimate
Calculated point estimate of incidence rate 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
a
The number of disease occurence among exposed cohort.
b
The number of disease occurence among non-exposed cohort.
PT1
The observed person-time of the exposed cohort.
PT0
The observed person-time of the unexposed cohort.
conf.level
Probability for confidence intervals. Default is 0.95.