TY - JOUR T1 - The redundant factor method and bladder cancer mortality. JF - Journal of Epidemiology and Community Health JO - J Epidemiol Community Health SP - 314 LP - 316 DO - 10.1136/jech.32.4.314 VL - 32 IS - 4 AU - J C Barrett Y1 - 1978/12/01 UR - http://jech.bmj.com/content/32/4/314.abstract N2 - Of the three factors, age at death, epoch of death, and epoch of birth, one seems almost superfluous. It may nevertheless be worthwhile to include all three in a mortality analysis, allowing for the constraints that the redundancy imposes. This procedure is applied to data for England and Wales on bladder cancer mortality from 1951 to 1970. ER -