The effect of the timing and spacing of observations in longitudinal studies of tobacco and other drug use: temporal design considerations.

@article{Collins2002TheEO,
  title={The effect of the timing and spacing of observations in longitudinal studies of tobacco and other drug use: temporal design considerations.},
  author={Linda M. Collins and John W. Graham},
  journal={Drug and alcohol dependence},
  year={2002},
  volume={68 Suppl 1},
  pages={S85-96}
}
This article explores the impact of the temporal design, i.e. the sampling of times of measurement, on the statistical and substantive conclusions drawn from longitudinal biomedical and social science research. It is shown that for a study of a given duration, if observations are spaced too far apart the resulting data can support misleading conclusions… CONTINUE READING