Empirical Research Review and Hypotheses
The theoretical review in the previous chapter sets the stage for a thorough summary of the extant empirical research concerning the key issues of this study: the relationship between age and crime (and how such a relationship supports or refutes the existence of two discrete groups of juvenile offenders and the stability of differences in criminal propensity over time within identifiable groups) and the relationship between past and subsequent criminal activity among individuals in the samples. Nagin and Land (1993) were the first to present evidence concerning both the number of distinct latent classes or offender groups and to discuss the relationship between age and crime for each specific group. D'Unger et al. (1998) conducted the most extensive examination of the age-crime curve to date when they analysed five separate data sets.
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