vcdExtra (version 0.6-5)

Toxaemia: Toxaemia Symptoms in Pregnancy

Description

Brown et al (1983) gave these data on two signs of toxaemia, an abnormal condition during pregnancy characterized by high blood pressure (hypertension) and high levels of protein in the urine. If untreated, both the mother and baby are at risk of complications or death. The data frame Toxaemia represents 13384 expectant mothers in Bradford, England in their first pregnancy, who were also classified according to social class and the number of cigarettes smoked per day.

Usage

data(Toxaemia)

source

Brown, P. J., Stone, J. and Ord-Smith, C. (1983), Toxaemic signs during pregnancy. JRSS, Series C, Applied Statistics, 32, 69-72

References

Friendly, M. (2000), Visualizing Categorical Data, SAS Institute, Cary, NC, Example 7.15.

Examples

data(Toxaemia)

tox.tab <- xtabs(Freq~class+smoke+hyper+urea,Toxaemia)
ftable(tox.tab, row.vars=1)


# symptoms by smoking
mosaic(~smoke+hyper+urea, data=tox.tab, shade=TRUE)

# symptoms by social class
mosaic(~class+hyper+urea, data=tox.tab, shade=TRUE)

# predictors
mosaic(~smoke+class, data=tox.tab, shade=TRUE)

# responses
mosaic(~hyper+urea, data=tox.tab, shade=TRUE)

# log odds ratios for urea and hypertension, by class and smoke
LOR <-loddsratio(aperm(tox.tab))
LOR