vcd (version 1.4-13)

VisualAcuity: Visual Acuity in Left and Right Eyes

Description

Data from Kendall & Stuart (1961) on unaided vision among 3,242 men and 7,477 women, all aged 30-39 and employed in the U.K. Royal Ordnance factories 1943-1946.

Usage

data("VisualAcuity")

Format

A data frame with 32 observations and 4 variables.

Freq

frequency of visual acuity measurements.

right

visual acuity on right eye.

left

visual acuity on left eye.

gender

factor indicating gender of patient.

References

M. G. Kendall & A. Stuart (1961), The Advanced Theory of Statistics, Vol. 2. Griffin, London.

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

Examples

data("VisualAcuity")
structable(~ gender + left + right, data = VisualAcuity)
sieve(Freq ~ left + right | gender, data = VisualAcuity, shade = TRUE)
cotabplot(Freq ~ left + right | gender, data = VisualAcuity,
          panel = cotab_agreementplot)