%0 Journal Article %T A Generalization of the Dirichlet Distribution %A Robin K. S. Hankin %J Journal of Statistical Software %D 2010 %I University of California, Los Angeles %X This paper discusses a generalization of the Dirichlet distribution, the ¡®hyperdirichlet¡¯, in which various types of incomplete observations may be incorporated. It is conjugate to the multinomial distribution when some observations are censored or grouped. The hyperdirichlet R package is introduced and examples given. A number of statistical tests are performed on the example datasets, which are drawn from diverse disciplines including sports statistics, the sociology of climate change, and psephology. %K Dirichlet distribution %K combinatorics %K R %K multinomial distribution %K constrained optimization %U http://www.jstatsoft.org/v33/i11/paper