title: Comment of Liying Luo's article, "assessing validity and application scope of the intrinsic estimator approach to the age-period-cohort problem".
authors.affiliation: Department of Sociology, University of Oregon, 736 PLC, Eugene, OR, 97403, USA, bobrien@uoregon.edu.
authors.forename: Robert M
authors.initials: RM
authors.lastname: O'Brien
mesh_terms: D015331:Cohort Studies; D006801:Humans; D015233:Models, Statistical; D012107:Research Design