The R Journal: article published in 2009, volume 1:1

expert: Modeling Without Data Using Expert Opinion
Vincent Goulet, Michel Jacques and Mathieu Pigeon , The R Journal (2009) 1:1, pages 31-36.

The expert package provides tools to create and manipulate empirical statistical models using expert opinion (or judgment). Here, the latter expression refers to a specific body of techniques to elicit the distribution of a random variable when data is scarce or unavailable. Opinions on the quantiles of the distribution are sought from experts in the field and aggregated into a final estimate. The package supports aggregation by means of the Cooke, Mendel–Sheridan and predefined weights models.

@article{RJ-2009-005,
  author = {Vincent Goulet and Michel Jacques and Mathieu Pigeon},
  title = {{expert: Modeling Without Data Using Expert Opinion}},
  year = {2009},
  journal = {{The R Journal}},
  doi = {10.32614/RJ-2009-005},
  url = {https://doi.org/10.32614/RJ-2009-005},
  pages = {31--36},
  volume = {1},
  number = {1}
}