When > 0 , and the independent variables are positively correlated over time , the second term is positive , so the usual ols variance underestimates the true variance of the estimator 当> 0 ，而且自变量在时间上是正相关时，第二项为正，因此通常的ols方差低估了估计量真实的方差。
Several regression models , with an independent variable of sea surface geostrophic current , were set up to simulate the real trajectories of drifters 对南海中伴随涡旋运动的2个浮标模拟试验显示，诸多模型中以海表地转流、风海流及背景流为自变量的回归模型模拟浮标漂流轨迹效果较好。
The caiv ( cost as an independent variable ) method is a method that the united states army is using at present carrying on optimization and the control to the life cycle cost of weapon equipment 以费用为独立变量( caiv )方法是美军目前采用的一种对武器装备型号的全寿命周期费用进行优化与控制的方法。
Experiments on the two drifters showed that the model , with independent variables of sea surface geostrophic current , ekman drift , and mean circulation , has the best efficiency of simulating real trajectories 利用该回归模型，模拟出南海2个漂流浮标轨迹和真实轨迹距离偏差较小且二者运动趋势基本一致。
4 . enterprise culture buffer analysis showed that only in a fair and independent variables , so as to the corporate culture of autonomy fair return equation , and individual acts of interaction 4 、企业文化的缓冲作用分析表明,只有在以自主公平做因变量时企业文化进入自主公平回归方程,与个体行为发生了交互作用。
Then we adopted the cointegration and error correction model as the algorithm of the model , which can resolve the line association in independent variable from inverse demand or supply model without losing the variable 研究结果表明，该理论能够在不损失任何信息与变量的条件下，有效解决模型中的多重共线性问题。
These three independent variables were grades ( grade 2 , grade 4 and grade 6 ) , levels of abstraction of concept ( basic level concept and superordinate level concept ) and categories ( living things and artifacts ) 三个变量分别是年级(二、四、六年级) 、概念抽象水平(基本类概念和上级类概念)和概念类别(生物体和人造物体) 。
The independent variables of multiple regressive model are decided by gray correlation analysis , which make multiple regressive model more unfeignedly reflect the truth of future and prediction accuracy improved 以灰色关联分析法确定进入回归模型的自变量,使回归模型尽可能真实反映系统未来预测的实际情况,提高预测精度。
This thesis uses the mean square error method , and it constructs the revised msb criterion . by reviewing the revised msb , we can choose the independent variables of the regression model and decrease the calculation 以前的文献中在考虑到模型选择的问题时，多会应用到已有的准则，例如： aic准则， bic准则， cp准则以及逐步法。
We adopted 2 x 2 x 3 design in this research . these three independent variables were grade ( grade 3 and grade 5 ) , gender ( male and female ) , methods of inspiration ( none , implicit and explicit ) 研究采用2 2 3的完全随机实验设计，三个自变量分别是年级(三、五年级) 、性别(男、女) 、启发方式(无启发、内隐启发、外显启发) 。
