vcd: VisualAcuity – R documentation

Become an expert in R — Interactive courses, Cheat Sheets, certificates and more!

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.

Source

M. Friendly (2000), Visualizing Categorical Data: http://euclid.psych.yorku.ca/ftp/sas/vcd/catdata/vision.sas

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)

vcd

Visualizing Categorical Data

v1.4-10

GPL-2

Authors

David Meyer [aut, cre], Achim Zeileis [aut] (<https://orcid.org/0000-0003-0918-3766>), Kurt Hornik [aut], Florian Gerber [ctb], Michael Friendly [ctb]

Initial release