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生长曲线的非参数回归分析AI 解读

In recent years, nonparametric curve estimates have been extensively explored in theoretical work. There has, however, been a certain lack of convincing applications, in particular involving comparisons with parametric techniques. The present investigation deals with the analysis of human height growth, where longitudinal measurements were collected for a sample of boys and a sample of girls. Evidence is presented that kernel estimates of acceleration and velocity of height,…

非标准情形下卡方检验统计量的分布AI 解读

The distribution of the X2 test under the null hypothesis is studied, when the parameters are estimated by the method of moments. A general formula, applicable also to other situations, is given. Three examples are studied in more detail and numerical reults are given, indicating how unsafe it can be to use a X2 distribution with a number of degrees of freedom smaller than or equal to the number of cells.

非标准情形下卡方检验的分布AI 解读

The distribution of the X2 test under the null hypothesis is studied, when the parameters are estimated by the method of moments. A general formula, applicable also to other situations, is given. Three examples are studied in more detail and numerical reults are given, indicating how unsafe it can be to use a X2 distribution with a number of degrees of freedom smaller than or equal to the number of cells.