fmsb (version 0.5.2)

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)

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.

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.

References

Rothman KJ (2012) Epidemiology: An Introduction. 2nd Ed., Oxford University Press, Oxford.

Examples

 res <- rateratio(136, 1709, 22050, 127650)
 str(res)
 print(res)