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What social networking elements are often applied to the process of social-commerce? ( ) A. like and sharing B. discussion and interaction C. connection D. all of the above
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坚持群众自愿、政策引导，鼓励并逐步规范常见病、多发病病人首先到基层医疗卫生机构就诊，对于超出基层医疗卫生机构功能定位和服务能力的疾病，由基层医疗卫生机构为病人提供转诊服务。( )A.对B.错 -
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A junior risk analyst is modeling the volatility of a certain market variable and is trying to decide between EWMA and GARCH(1,1) models. Which of the following statements about the two models is correct?（ ） A.The EWMA model is a special case of the GARCH(1,1) model with the additional assumption that the long run volatility is zero.B.A variance estimated from the GARCH(1,1) model is a weighted average of the prior day's estimated variance and the prior day's squared return.C.The GARCH(1,1) model assigns a higher weight to the prior day's estimated variance than the EWMA model.D.A variance estimated from the EWMA model is a weighted average of the prior day's estimated variance and the prior day's squared return.
