Right eye

Left eye grade

 

grade

Best (1)

Second (2)

Third (3)

Worst (4)

Total

Best (1)

1520

266

124

66

1976

 

( 1520.00 )

( 263.37 )

( 133.35 )

( 59.12 )

 

 

( 1520.00 )

( 263.77 )

( 133.53 )

( 59.10 )

 

 

( 1520.00 )

( 263.38 )

( 133.58 )

( 59.04 )

 

Second (2)

234

1512

432

78

2256

 

( 236.63 )

( 1512.00 )

( 418.23 )

( 88.53 )

 

 

( 236.23 )

( 1512.00 )

( 418.19 )

( 88.38 )

 

 

( 236.62 )

( 1512.00 )

( 418.99 )

( 88.39 )

 

Third (3)

117

362

1772

205

2456

 

( 107.65 )

( 375.77 )

( 1772.00 )

( 202.27 )

 

 

( 107.47 )

( 375.81 )

( 1772.00 )

( 201.92 )

 

 

( 107.42 )

( 375.01 )

( 1772.00 )

( 201.57 )

 

Worst (4)

36

82

179

492

789

 

( 42.88 )

( 71.47 )

( 181.73 )

( 492.00 )

 

 

( 42.90 )

( 71.62 )

( 182.08 )

( 492.00 )

 

 

( 42.96 )

( 71.61 )

( 182.43 )

( 492.00 )

 

Total

1907

2222

2507

841

7477
Table 1: Unaided distance vision of 7477 women aged 30-39 employed in Royal Ordnance factories in British from 1943 to 1946; from Stuart [9]. (Upper, middle and lower parenthesized values are the maximum likelihood estimates of expected frequencies under the , , and models, respectively).