它接收两个输入变量，并返回这两个数值的差。
It takes two input variables and returns the difference of those two Numbers.
对于连续性变量结局，你需要输入每组的参与者数目、结局的平均值和标准差。
For continuous outcomes, you will need to enter the number of participants, the mean outcome value and the standard deviation for each group.
3方差的专业定义是随机变量的二次中心矩，与期望值之差的平方的加权平均值。
The technical definition of variance is the random variable's second central moment, the weighted average of the square of the differences from the expected value.
其次，相比一个标准差的美国幸福感（即0.635），这对大多数变量系数看起来很小。
Second, when compared to the size of one standard deviation of Americans' reported happiness (which is 0.635), the coefficients on most of these variables look small.
伪抛物型方程中关于时间与空间变量的混合偏导项给差分格式的讨论带来了一定难度。
The mixed partial differential terms of time variables and space variables in the pseudo-parabolic equation make the discussion of the difference scheme more difficult.
将相对差商法和混沌优化结合起来，形成求解离散变量桁架结构拓扑优化设计的混合算法。
A hybrid algorithm for topology optimization of trusses with discrete variables is developed which combines relative difference quotient algorithm with chaos optimization.
将所有的研究的数据合成，对于分类变量效应指标为风险比，对于连续型变量效应指标为加权均数差，根据研究样本的大小来加权。
Data were pooled across studies, and relative risks for categorical outcomes and weighted mean differences for continuous outcomes, weighted according to study sample size, were calculated.
将波浪辐射应力与抛物型缓坡方程中的待求变量联系起来，提出了一种计算辐射应力的新方法，并用有限差分法对控制方程进行了数值求解。
A new method for the solution of wave radiation stresses is proposed by linking wave radiation stresses with the variables in the parabolic mild-slope equation.
首先利用付里叶变换，使问题的求解转换成对一对变量为裂纹面上位移差的对偶积分方程的求解。
By using the Fourier transform, the problem can be solved with a pair of dual integral equations in which the unknown variable is the jump of displacements across the crack surfaces.
建立了以水平井生产端压差为目标函数、以孔眼分布为决策变量的优化模型，同时和均匀流入剖面、均匀射孔分布的结果进行了对比。
The optimization model which the horizontal well drawdown is regarded as objection function and the perforation distribution as decision variable is presented.
通过减变量残差图，不但可以容易地考察一个变量在模型中的作用，而且可以诊断样本点对模型和变量的影响大小。
It can not only be used to determine the importance of an explanatory variable in the regression model, but also to detect some cases with influence on the model and variables.
根本上，这是关于两个基本主要变量(总利率和贷款拖欠率)之间的差的问题。
Fundamentally, it's an issue of the spread between two basic, primary variables: a gross interest rates and b default rates.
计算中采用守恒变量型的NND差分格式和全流场捕捉技术；
The NND schemes in conservative variable type and shock capturing technology are used in the calculations.
回归模型的残差项反映了对被解释变量有影响但未列入解释变量的因素所产生的噪音，这部分噪音可由时间序列模型进行拟合。
The residual term in the regression model is the noise generated by the omitted variables that influent dependent variable in the model. The time series model can fit this noise.
变量的均值敏感性因子和标准差敏感性因子是高度相关的，都可以用来识别最敏感的随机变量。
The mean sensitivity coefficient and the standard deviation sensitivity coefficient are strongly related and both can be used to identify key contributing random variables.
变量施肥的控制实施系统包括差分gps系统、田间计算机、液压马达、测速雷达和排肥器总成。
The control and actualize system of variable rate fertilization consist of DGPS, Field Computer, Hydraulic Motor, Ground Sensing Radar and fertilizer assembly.
似然变量的一阶差分，可以用于检测来自其它概率分布的数据点的位置，改善反褶积的效果。
The first order difference of likelihood variable may be used to locate data points in other probability distributions and to improve deconvolution result then.
另一个方法是使用相邻节点之间的压差作为状态变量，这种处理可以使模型更加完整，也可改善低流量下的计算精度。
Another method is to use the pressure difference between adjacent nodes as state parameters, this can make the model more complete and can improve calculation accuracy under low-flow system.
然后，将差分公式展开，得出了直接用自变量的多项式形式表示的改进的EVERETT插值公式。
Then an improved EVERETT interpolation formula in the form of polynomial of the variable is obtained by developing the differential form.
本文计算、分析、确定了限压式变量系和差压式变量泵输出功率最大值和节能效率最大值的压力点；
This paper calculates, analyses and determines the pressure point of maximum of ouput power and saving-energy efficiency of differential pressure and Limited pressure variable displacement pump.
科学计算及其应用常常需要多变量函数的有关偏导数问题的计算，通常使用的计算方法是符号微分或差分近似。
Evaluation relevant to the partial derivatives of the multivariable functions is often done in scientific computation, usually by means of the symbolic differentiation or the divided difference.
对于从属随机变量统计特征的确定，本文介绍了一种精确高效的确定其均值和标准差的方法。
A new method which can efficiently and accurately calculate the mean and standard deviation of a dependent random variable is proposed.
在评价一个正态线性棋型的准确性时，偏残差图、增加变量图和构造变量图是三个有用的过程。
The added variable plot, partial residual plot and constructed variable plot are three useful diagnostic procedures in assessing the accuracy of a normal linear model.
研究具有连续变量的中立型差分方程，建立非线性差分方程与其对应线性差分方程振动性间的关系。
Establishes the relationship between the oscillation of neutral difference equations with continuous variable and that of its associated linear limiting equations.
单变量方法在实际中使用最多，主要涉及分数差分模型、结构模型、贝叶斯预测方法。
Univariate forecasting methods are still used far more in practice, such as Fractional Differencing models, Structural models and Bayesian forecasting methods.
通过简化异步发电机模型，将异步电机的滑差引入到计算变量中；将风电机组的机械功率与电磁功率之差作为等式约束加入到算法中。
Making use of simplified asynchronous generator model, the paper introduced slips into variables, taken mechanical and electrical power unbalances as equation restrains to add in the algorithm.
在获得了兴趣点之后，利用兴趣点处的局部灰度差分不变量进行序列图像的点特征匹配。
Once the interest points were detected, the image matching process in an image sequence is performed using local gray-value differential invariants.
在获得了兴趣点之后，利用兴趣点处的局部灰度差分不变量进行序列图像的点特征匹配。
Once the interest points were detected, the image matching process in an image sequence is performed using local gray-value differential invariants.
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