The Regions of Unimodality and Positivity in the Abbreviated Edgeworth and Gram-Charlier Series
截短 Edgeworth 与 Gram–Charlier 级数的单峰性和正性区域
0. On the notation. In the literature it is common to use , and oto denote, respectively, the population mean and standard deviation and so these are used here. Since there is more than one symbol prevalent these days for the coefficient of skewness it is well to state at the outset that in this paper a! is used to denote this parameter. In practice, these population parameters are usually unknown and estimated from the sample. 1. Introductory remarks. The methods of fitting…