RRinv {sasLM}

Relative Risk of two groups with strata by inverse variance method

Description

Relative risk and its score confidence interval of two groups with stratification by inverse variance method

Usage

  RRinv(d0, conf.level=0.95)

Arguments

d0

A data.frame or matrix, of which each row means a stratum. This should have four columns named y1, n1, y2, and n2; y1 and y2 for events of each group, n1 and n2 for sample size of each stratum. The second group is usually the control group.

conf.level

confidence level

Details

It calculates relative risk and its confidence interval of two groups by inverse variance method. This supports stratification. This can be used for meta-analysis also.

Value

The following output will be returned for each stratum and common value. 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. The point estimate of common RR is calculated with MH weight.

lower

lower confidence limit of RR

upper

upper confidence limit of RR

Author(s)

Kyun-Seop Bae [e-mail]

See Also

RDmn1, RRmn1, ORmn1, RDmn, RRmn, ORmn, RDinv, ORinv, ORcmh

Examples

  d1 = matrix(c(25, 339, 28, 335, 23, 370, 40, 364), nrow=2, byrow=TRUE)
  colnames(d1) =  c("y1", "n1", "y2", "n2")
  RRinv(d1)