When the statistics distribution of interested is complex or vague, Bootstrap method may be used to estimate standard error and confidence interval. However, the results derived from parametric and nonparametric Boots...
详细信息
When the statistics distribution of interested is complex or vague, Bootstrap method may be used to estimate standard error and confidence interval. However, the results derived from parametric and nonparametric Bootstrap methods applied to hierarchically structured data may be different. According to the comparing, we found and concluded that nonparametric Bootstrap method is relating seldom affected by the distribution in models. In terms of the nonparametric Bootstrap sampling, the effectiveness of sampling on the highest level unit is more satisfactory than lower level units. The estimation of confidence intervals and hypothesis testing of intraclass corelation coefficients is discussed based on multilevel generalized linear models.
微量元素是指虽然其量极微,但对生命却是必不可少的金属元素(湿重组织每 g 约10-12～10-9g),据目前已知有10余种,诸如铁、氟、硒、锌、铜、钼、钴、铬、锰、碘、镍、锡、硅、铅、钒。其中尤以钴、锌、铅、铜为重要。晚近由于原子吸收分...
详细信息
微量元素是指虽然其量极微,但对生命却是必不可少的金属元素(湿重组织每 g 约10-12～10-9g),据目前已知有10余种,诸如铁、氟、硒、锌、铜、钼、钴、铬、锰、碘、镍、锡、硅、铅、钒。其中尤以钴、锌、铅、铜为重要。晚近由于原子吸收分光光度法技术的问世,使不少有关微量元素的基础理论研究工作取得了较大的进展,逐渐地被临床用为某
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