Assessment of unaided distance vision of women in Britain.
Usage
vision
Format
A contingency table with 7477 observations on 2 variables.
Right.Eye
a factor with levels "Highest Grade", "Second Grade",
"Third Grade" and "Lowest Grade".
Left.Eye
a factor with levels "Highest Grade", "Second Grade",
"Third Grade" and "Lowest Grade".
Details
Paired ordered categorical data from case-records of eye-testing of 7477 women
aged 30–39 years employed by Royal Ordnance Factories in Britain during
1943–46, as given by Stuart (1953).
Stuart (1955) used this data set to illustrate a test of marginal homogeneity.
Source
Stuart, A. (1953). The estimation and comparison of strengths of association
in contingency tables. Biometrika40(1/2), 105–110.
References
Stuart, A. (1955). A test for homogeneity of the marginal distribution in a
two-way classification. Biometrika42(3/4), 412–416.