ratedifference {fmsb}R Documentation

Calculate incidence rate difference and its confidence intervals

Description

Calculate incidence rate difference (a kind of attributable risk / excess risk) and its confidence intervals based on approximation, followed by null hypothesis (rate difference equals to 0) testing.

Usage

 ratedifference(a, b, PT1, PT0, CRC=FALSE, conf.level=0.95) 

Arguments

a

The number of disease occurence among exposed cohort.

b

The number of disease occurence among unexposed cohort.

PT1

The observed person-time in exposed cohort.

PT0

The observed person-time in unexposed cohort.

CRC

Logical. If TRUE, this function also calculates the incidence rates for each cohort and for both combined, with confidence intervals. Default FALSE.

conf.level

Probability for confidence intervals. Default is 0.95.

Value

estimate

Calculated point estimate of rate difference.

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.

Author(s)

Minato Nakazawa (minato-nakazawa[atmark]umin.net)

Examples

 res <- ratedifference(136,1709,22050,127650,CRC=TRUE,conf.level=0.9)
 str(res)
 print(res)

[Package fmsb Index]