vcd (version 0.1-3.4)

plot.oddsratio: (Log) Odds Ratios Plots

Description

Plots (log) odds ratios, computed by oddsratio for 2 x 2 x k-tables, along with confidence intervals.

Usage

## S3 method for class 'oddsratio':
plot(x, confidence = TRUE, type = "o",
     ylab = NULL, xlab = "Strata", whiskers = 0.1, ...)

Arguments

x

An object of class logoddsratio, computed for a 2 x 2 x k-table.

confidence

if TRUE, confidence intervals are plotted for each data point.

type

plot type.

ylab

label for the y-axis. The default results in "Odds Ratio" or "Log Odds Ratio", as appropriate.

xlab

label for the x-axis.

whiskers

Width of the confidence interval whiskers.

...

Other graphics parameters (see par).

References

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

See Also

oddsratio

Examples

data(CoalMiners)
l <- oddsratio(CoalMiners)
g <- seq(25, 60, by = 5)
plot(l,
     xlab = "Age Group",
     main = "Breathelessness and Wheeze in Coal Miners")
m <- lm(l ~ g + I(g^2))
lines(fitted(m), col = "red")