Methodological problems arising in fitting nonlinear regressions to a
dataset are identified in context of research on the age-crime relatio
nship. A modified chi-square distribution is fit to the age distributi
on of the seven Index crimes for the years 1952, 1957, 1962, 1967, 197
2, 1977, 1982, and 1988 to assess the historical invariance of the dis
tribution. Problematic features of Britt's (J. Quant. Criminol. 8, 175
-187, 1992) analysis of the same data are highlighted.