vision {coin} | R Documentation |
Assessment of unaided distance vision of women in Britain.
vision
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"
.
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.
Stuart, A. (1953). The estimation and comparison of strengths of association in contingency tables. Biometrika 40(1/2), 105–110.
Stuart, A. (1955). A test for homogeneity of the marginal distribution in a two-way classification. Biometrika 42(3/4), 412–416.
## Asymptotic Stuart(-Maxwell) test (Q = 11.96) diag(vision) <- 0 # speed-up mh_test(vision)