Abstract
The mathematical relationship between alternative measures of occupational and industrial segregation is explored. Several theorems are proven which expose some fallacies regarding the two most common measures and establish a link between them. A new index is introduced which measures the extent of the compound effect of segregation by occupation and industry. Indices of segregation are calculated from Commonwealth Census data from 1891 to 1976. Estimation of log-linear equations indicate that segregation by sex is declining; the rate of decrease, however, is slowing down and substantial changes in segregation before the year 2001 are unlikely if past trends continue.