W. W. S. Chen, “Evaluation of the First 12 Derivatives of the Digamma PSI Functions with Applications,” Proceeding of Statistical Computing Section, 1982, pp. 293-298.

has been cited by the following article:

• TITLE: The Riemannian Structure of the Three-Parameter Gamma Distribution

  AUTHORS: William W. S. Chen, Samuel Kotz

  KEYWORDS: Mean Curvature; Gamma Distribution; Ricci Curvature; Riemannian Geometry; Scalar Curvature; Sectional Curvature

  JOURNAL NAME: Applied Mathematics, Vol.4 No.3, March 22, 2013

  ABSTRACT: In this paper, we will utilize the results already known in differential geometry and provide an intuitive understanding of the Gamma Distribution. This approach leads to the definition of new concepts to provide new results of statistical importance. These new results could explain Chen [1-3] experienced difficulty when he attempts to simulate the sampling distribution and power function of Cox’s [4,5] test statistics of separate families of hypotheses. It may also help simplify and clarify some known statistical proofs or results. These results may be of particular interest to mathematical physicists. In general, it has been shown that the parameter space is not of constant curvature. In addition, we calculated some invariant quantities, such as Sectional curvature, Ricci curvature, mean curvature and scalar curvature.