Modelling Data Containing Exact Zeroes Using Zero Degrees of Freedom
研究了零自由度非中心卡方分布，它能拟合包含精确零值的连续数据，证明了最大似然估计的存在性和唯一性，并给出了计算方法和实例。
SUMMARY The noncentral chi-squared distribution with zero degrees of freedom can be used to model continuous data of a variety of shapes that also contain exact zero values. Existence and uniqueness of the maximum likelihood estimates for the scaled non-central chi-squared distribution with zero degrees of freedom are established, computational methods are considered, and an illustrative example is given.