vcd (version 0.1-3.5)

oddsratio: Odds Ratios

Description

Computes (log) odds ratios and their asymtotic standard errors for (possibly) stratified data.

Usage

oddsratio(x, stratum = NULL, log = TRUE, conf.level = 0.95)

Arguments

x

a 2 x 2 x ... table.

stratum

vector of strata dimensions.

log

if FALSE, ordinary odds ratios are computed

conf.level

confidence level used for confidence intervals.

Value

• An object of class logoddratio, which is simply a vector of (log) odds ratios with dimensionality depending on stratum, along with the following attributes:
• ASE
  a vector with the asymptotic standard errors
• lwr, upr
  a vector with lower/upper confidence bounds
• Z
  test statistic for significance tests (only computed for log odds ratios: simply the standardized log odds ratio, which follows an asymptotic normal distribution.
• P
  p-value for this test.
• log
  logical value indicating if log odds ratios or common odds ratios are computed.

References

M. Friendly (2000), Visualizing Categorical Data. SAS Institute, Cary, NC.

See Also

plot.oddsratio

Examples

data(CoalMiners)
summary(oddsratio(CoalMiners))