Toxaemia Symptoms in Pregnancy
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.
data(Toxaemia)
A data frame in frequency form representing a 5 x 3 x 2 x 2 contingency table, with 60 observations on the following 5 variables.
classSocial class of mother, a factor with levels 1 2 3 4 5
smokeCigarettes smoked per day during pregnancy, a factor with levels 0 1-19 20+
hyperHypertension level, a factor with levels Low High
ureaProtein urea level, a factor with levels Low High
Freqfrequency in each cell, a numeric vector
Brown, P. J., Stone, J. and Ord-Smith, C. (1983), Toxaemic signs during pregnancy. JRSS, Series C, Applied Statistics, 32, 69-72
Friendly, M. (2000), Visualizing Categorical Data, SAS Institute, Cary, NC, Example 7.15.
Friendly, M. and Meyer, D. (2016). Discrete Data Analysis with R: Visualization and Modeling Techniques for Categorical and Count Data. Boca Raton, FL: Chapman & Hall/CRC. http://ddar.datavis.ca. Example 10.10.
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 ## Not run: LOR <-loddsratio(aperm(tox.tab)) LOR ## End(Not run)
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