The data contain the frequency distribution of patent citations that fall in a category of typical count data. They were used by
Lee et al. (2007) and
fitted by the zero-inflated models.
References
Lee, Y. G., Lee, J. D., Song, Y. I., & Lee, S. J. (2007). An in-depth empirical analysis of patent citation counts using zero-inflated
count data model: The case of KIST. Scientometrics, 70(1), 27-39.