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大家知道,方差表示数据的波动情况,方差越小,数据波动越小,成绩回越稳定.利用方差这一特性,我们可以在生活决策时衡量风险的大小,方差越小,风险越小;方差越大,风险越大.在实际生活里,方差衡量风险的办法被广泛应用.“股市有风险,入市须谨慎.”这是股票市场的警示语.资产风险是指资产收益率的不确定性,不确定性越高风险越大.因此购买股票时要研究风险,衡量风险的指标之一就是收益率的方差.
As we all know, the variance means the fluctuation of the data, the smaller the variance, the smaller the data fluctuation, the more stable the performance returns.Using the characteristic of variance, we can measure the size of the risk in the life decision-making, the smaller the variance is, the less the risk is; In real life, the measure of variance is widely used. “” Stock market risk, the market must be cautious. "This is the warning of the stock market. Asset risk refers to the return on assets is not Certainty, the higher the uncertainty the greater the risk.Therefore, to study the risk of buying stocks, one measure of risk indicators is the variance of the yield.