这方面尤其如此，因为贵国那个地区的不同地方差别很大。
This is especially so, since there are such vast differences between the various places in that part of your country.
比赛结果的胜负双方差距极小。
另一个基本的概念是协方差。
参数的变动越多,方差就越大
负值的协方差就表示，二者反向变动。
A negative covariance means that they tend to move opposite each other.
图3：方差区间内完成任务的可能性。
Figure 3: Likelihood of completing a task within the variance interval.
非常量误差方差或异方差性。
协方差衡量的是两个变量一起变动的情况。
Covariance is a measure of how much two variables move together.
标准差是方差的平方根。
图1：平均值为3且方差为1的正态分布。
反之，风险是向项目方差中加入的某个条件。
On the contrary, a risk is some condition that adds to project variance.
由模型说明的方差比例范围为21%至28%。
The proportions of the variance explained by the models ranged from 21% to 28%.
应该用控制循环来管理项目，促使项目方差为零。
Projects should be governed using a control loop to drive project variance to zero.Figure 8: project governance control loop.
V0是初始方差。
也就是说，在阶段I的末尾，去掉了80%的方差。
That is, at the end of Stage I, 80% of the variance has been removed.
萨摩亚与西方在文化上很多地方差异非常大。
Samoan culture is very different from most Western cultures.
随机变量的方差衡量随机变量值与期望值偏离的程度。
The variance of a random variable measures how far from the expected value its values typically are.
去除的风险测量，即，减少关键项目度量标准的方差。
A measure of risk removed, i.e., the reduction of variance of key project metrics.
注意到风险的严重程度直接关系到项目参数的估计中的方差。
Note that severity of risk is directly related to the variance in the estimation of a project's parameters.
注意选择度量标准的指导原则是它们怎样影响具体项目参数的方差。
Note that a guiding principle for choosing metrics is how they will affect a specific project parameter's variance.
因此，由于在新知识的获取方面进行合作交流，方差随着时间减少了。
Hence, the variance diminishes over time due to collaborative interaction on new knowledge acquisition.
期望值越高越好,方差就相反,因为方差代表着风险,也就是不确定性
Expected value is good and variance is bad because that's risk; that's uncertainty.
假设估算的任务持续时间是3个月，并且估计的方差是1 个月。
Suppose the estimated duration of a task is 3 months, and the variance of the estimate is 1 month.
他告诉我，我们站的地方差不多正好是1944年他登陆的地方。
He told me we were standing almost exactly where he had landed in 1944.
很明显，随着项目参数估计中方差的增加，成功完成项目的可能性就减少。
Clearly, as the variance in the estimates of project parameters increases, the likelihood of completing the project successfully decreases.
这个简单线性回归过程中的下一步是确定其余的预测方差是否可以接受。
The next step in the simple linear regression procedure is to determine if the remaining squared error of prediction is acceptable or not.
您可以利用此函数将您的样本方差计算转换为样本标准差计算，如清单8所示。
You can use it to turn your variance measurement into a standard deviation measurement, as shown in Listing 8.
例如，与项目成本或持续时间无关的度量标准不能帮助评估迭代中的方差削减。
For example, a metric that does not correlate to the project cost or duration cannot aid in assessing the variance reduction in the iterations.
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.
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