| 1. | If the assumption fails , we say the model exhibits heteroskedasticity
如果这个假定不成立，我们说模型存在异方差性。 |
| 2. | We also analysis the heteroskedasticity of serial correlation and find the linkage between the serial
所以,股票的成交量与它的市场价格有效性之间存在一定的联系。 |
| 3. | Reason no . 1 : we may prefer to report the usual ols standard errors and test statistics unless there is evidence of heteroskedasticity
理由1 ：除非有证据显示异方差存在，我们仍会偏好于常规ols的标准差及检验统计量。 |
| 4. | Secondly , the rate of return in china ' s stock has auto regressive heteroskedasticity phenomena and it should be considered in the calculation of var
其次，中国证券市场指数收益率存在条件异方差现象，在计算var的过程中应予以考虑。 |
| 5. | In the empirical analysis , pp plot or other test methods show that logarithmic return time series of financial assets have leptokurtosis and heteroskedasticity
在实证研究中，利用pp图和其它检验方法得到金融资产的对数收益时间序列有高峰厚尾和arch效应。 |
| 6. | While it ' s always possible to estimate robust standard errors for ols estimates , if we know something about the specific form of the heteroskedasticity , we can transform the model into one that has homoskedastic errors ? called weighted least squares
对ols估计稳健标准差总是可能办到的，但是，如果我们知道一些关于异方差结构的信息，我们可以将原模型转化为具有同方差的新模型，这称为加权最小二乘法。 |
| 7. | The article analyses whether the theory of emh market can explain some phenomena on capital market . we provide some evidence for the non - normal , non - gaussian distribution , auto - correlation , non - linear and heteroskedasticity character of stock price
文章就有效市场假说( emh )对现实资本市场的解释能力进行了分析，发现我国股票市场的股价收益率序列具有非正态性、自相关性、非线性、异方差性等特点。 |
| 8. | The distributions studied are normal distribution , student - t distribution , skewed student - t distribution and general error distribution . besides this , considering the conditional heteroskedasticity of the time serial in financial market , apply the garch model into the estimation of var
在此基础上，研究了证券市场上时间序列收益率波动的条件异方差性，考虑中国证券市场的风险特征，将garch系列模型与var模型相结合，构造了基于不同分布条件下的var模型。 |
| 9. | Non - gaussian distribution and noniinear , auto - - correlation and heteroskedasticity character of stock price and return rates , presented that main factors leads to the failure of emh on chinese stock market is emotionai action , information - - based herding , over - - reaction and under - reaction to information of investors and noniinear , non - equiiibriurn propefty of stock market
提出有效市场理论失灵的主要原因是投资者的非理性行为，信息反映的羊群效应，投资者存在反应过度和反应不足现象，股票市场的非均衡特征和股票市场的非线性特征。 |
| 10. | The sixth chapter " essay on the estimation of stock price model " briefly introduced evolution of chinese stock market , showed the abrupt change and discontinuity of chinese stock market return , estimated the three models on the shanghai security exchange comprehensive index , compared the result made by the three models ? the result showed that the figarch model is better in modelling the autocorrelation , heteroskedasticity and nonlinear characteristics of stock price than the others
建立了上证指数的arfima ， garchzjifigarchta刑种杖刑，并对模二解冰股票价格波动的囱相关性，异方差性和非线性市场的效果以及对价格的问归和预测效果作了比较，得出结论n a ch模型在解决这些问题上效果最好，二种模刑在价格问归和预测值上都存在一阶滞后问题。 |
