Preface to First Edition - lib

48 SIMPLE INFERENCETable 3.3:water data (continued).location town mortality hardnessSouth Oxford 1175 107South Plymouth 1486 5South Portsmouth 1456 90North Preston 1696 6South Reading 1236 101North Rochdale 1711 13North Rotherham 1444 14North St Helens 1591 49North Salford 1987 8North Sheffield 1495 14South Southampton 1369 68South Southend 1257 50North Southport 1587 75North South Shields 1713 71North Stockport 1557 13North Stoke 1640 57North Sunderland 1709 71South Swansea 1625 13North Wallasey 1625 20South Walsall 1527 60South West Bromwich 1627 53South West Ham 1486 122South Wolverhampton 1485 81North York 1378 71The two-way contingency table in Table 3.4 shows the number of piston-ringfailures in each of three legs of four steam-driven compressors located in thesame building (Haberman, 1973). The compressors have identical design andare oriented in the same way. The question of interest is whether the twocategorical variables (compressor and leg) are independent.The data in Table 3.5 (taken from Agresti, 1996) arise from a sample ofjuveniles convicted of felony in Florida in 1987. Matched pairs were formedusing criteria such as age and the number of previous offences. For each pair,one subject was handled in the juvenile court and the other was transferred tothe adult court. Whether or not the juvenile was rearrested by the end of 1988was then noted. Here the question of interest is whether the true proportionsrearrested were identical for the adult and juvenile court assignments?© 2010 by Taylor and Francis Group, LLC