For the underlying method, please cite the following paper

Lebo, M. and Weber, C. 2015. An Effective Approach to the Repeated Cross Sectional Design. American Journal of Political Science 59(1): 242-258.

Corresponding BibTeX entry:

  @Article{,
    title = {An Effective Approach to the Repeated Cross-Sectional
      Design},
    author = {{Lebo} and Matthew J and {Weber} and {Christopher}},
    journal = {American Journal of Political Science},
    year = {2015},
    volume = {59},
    number = {1},
    pages = {242--258},
    publisher = {Wiley Online Library},
  }