---
title: "Vision Example"
author: "John Donooghue"
date: "July 24, 2025"
output: html
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```

## Vision Example
This data has been used in a variety of papers.  It consists of measures of eyesight acuity
for women employed in the Royal Ordinance factory from 1943-1946.  The rows and columns are ratings of eyesight on a 1-4 scale (1 being highest), for the right (rows) and left (columns) eyes.  Data for men are found in vision_data_men.R.  There is also a comparison of the margins for women and men in gender_vision.R.  This last is used in McCullagh_ordinal_regression.

The data set was originally published by Stuart, A. (1953). The Estimation and Comparison of Strengths of Association in Contingency Tables.  Biometrika, 40(1/2) 105-110.
