epitools (version 0.09)

risk.ratio: Risk ratio estimation and confidence intervals

Description

Calculates risk ratio and confidence interval with and without a smallsample adjustment

Usage

risk.ratio(x1, n1, x0, n0, conf.level = 0.95)

Arguments

x1

number of events among the exposed

n1

number of total exposed

x0

number of events among the non-exposed

n0

number of total unexposed

conf.level

confidence level (default = 0.95)

Value

• $data
  Original data with marginal totals included
• $p.value
  Fishers Exact Test from 'fisher.test'
• $conf.level
  Confidence level
• $crude
  Estimate and confidence limits
• $adjusted
  Estimate and confidence limits with small sample adjustment

Details

This function Calculates the risk ratio and confidence interval, with and without a small sample adjustment, for a 2 x 2 table.

References

Jewell NP. Statistics for Epidemiology, 1st Edition, 2004, Chapman & Hall, pp. 81-82

See Also

See also odds.ratio, epitab

Examples

##From Jewell (2004), p. 83
risk.ratio(178, 1589, 79, 1565)