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(2009-04-10 19:09:52)
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(2009-04-09 20:33:37)
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有2袋水果,第一袋中3个苹果2个橘子,第二袋中5个苹果3个橘子,问每袋拿一个正好一个苹果一个橘子的概率。。。[阅读全文]
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(2009-04-08 20:56:32)
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http://web.wenxuecity.com/BBSView.php?SubID=style&MsgID=1498653[阅读全文]
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Twoofthemostimportantconceptsininvestingarereturnandrisk.Ifreturnsofsecuritiesareviewedasrandomvariables,thentherewardofaportfoliocanbemeasuredastheexpectation,ormean,oftheportfolioreturnanditsriskcanbemeasuredasthevarianceoftheportfolioreturn.Ofcourse,manyotherapproachesarepossible,butmean-variance
analysisisoneofthesimplestandmostpowerful.ThisapproachwassuggestedbyHarryMarkowitz,whowontheNob...[阅读全文]
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