So we consider five financial indexes includes stock b / p , e / p , current stock size , current stock stru and financial levge by the international tradition , then descriptive statistical test method and cross section statistical test method proved that b / p and current stock size have marked effect on the securities yield besides coefficient b . in the third chapter , the article fut forward a risk factor model , estimates yield sequences of every risk factor by weight regression , and then estimates each risk factor coefficient of different stock by time sequence regression , at last we can reckon the portfolio risk o2p and yield rp which consists n stocks
2.
Secondly , revise factor coefficient with probability distribution , which given by experienced experts . thirdly , use bayes statistic deducing method to bind together the income rate of prior distribution and sample in formation , which makes forecast stocks in shenzhen stock market as samples . work out the series of weakly income rate
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