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This paper introduces the concept of the ‘age-profile’, which represents the proportions of cohort populations surviving from birth to a given year. Life tables for Australia and three-dimensional diagrams based on these data are used to illustrate the difference between the ‘age-profile’ values for a given year and the transverse survival values for the same year. The last part of the paper describes areas in which the ‘age-profile’ might be used with reference to its value in representing the experience of cohorts. [ABSTRACT FROM PUBLISHER]

The index "the proportion of a cohort that have become delinquent by a given age," here called the "prevalence of delinquency," is an important social indicator. In the present paper, we indicate methods by which this index can be estimated from data, and correct errors in previous sex- and racespecific prevalence estimates published by Monahan (1960) for the city of Philadelphia. The difference between the sexes and between the races shown by these corrected prevalence estimates are of sufficient magnitude to render suspect any comparisons of prevalences of delinquency among cohorts which do not take account of the sex and race compositions of the cohorts to be compared. [ABSTRACT FROM AUTHOR]