The Methodology Center, The Pennsylvania State University, State College, Pennsylvania, USA.
Subst Use Misuse. 2011;46(6):758-68. doi: 10.3109/10826084.2010.537731. Epub 2010 Dec 21.
The goal of this study is to provide an empirical example using longitudinal cigarette smoking data that compares results of growth mixture trajectory models on the basis of contiguous and snapshot measurements. Data were drawn from an intensive longitudinal study of college freshman (N = 905) with a previous history of smoking. Participants provided weekly smoking reports for 35 consecutive weeks. We found that using contiguous weekly data (35 waves) or 6-wave or 4-wave snapshot data provided similar trajectory curves and proportions. However, there were notable differences in individual trajectory assignments on the basis of contiguous and snapshot measurements.
本研究的目的是提供一个使用纵向吸烟数据的实证例子，比较基于连续和快照测量的增长混合轨迹模型的结果。数据来自对有吸烟史的大学新生（N=905）的一项密集纵向研究。参与者每周提供 35 次连续的吸烟报告。我们发现，使用连续的每周数据（35 波）或 6 波或 4 波快照数据提供了相似的轨迹曲线和比例。然而，基于连续和快照测量的个体轨迹分配存在显著差异。
