用中华民族意识凝聚青海各民族问题调研报告

青海各民族在政治、经济、文化等方面经过长期的交流、相互融合,形成了各民族多元一体的格局,这是用中华民族意识凝聚青海各民族的历史与现实条件。但在现阶段仍存在着阻碍青海各民族中华民族意识生长的因素,据此,提出青海增强中华民族凝聚力的对策建议。     

Scale estimators for symmetric stable distributions

This paper reports on a simulation comparison of scale estimators for symmetric stable distributions in terms of their ability to identify the population with the greater scale. The modified geometric mean is found to be superior to the sample standard deviation and the Fama-Roll estimator for the larger values of the characteristic exponent, while the Fama-Roll estimator is judged superior for the smaller values. Further, this study sheds some light on the question of the appropriate sample size for discriminating risk measurement in investment analysis when the samples are taken from symmetric stable distributions.