coin (version 1.2-2)

vision: Unaided Distance Vision

Description

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.

References

Stuart, A. (1955). A test for homogeneity of the marginal distribution in a two-way classification. Biometrika 42(3/4), 412--416.

Examples

# NOT RUN {
## Asymptotic Stuart(-Maxwell) test (Q = 11.96)
diag(vision) <- 0 # speed-up
mh_test(vision)
# }