异方差是对同方差（Homoscedasticity）假设的违背。同方差是随着样本观察点的变化，线性模型中随机误差项的方差并不改变，保持为常数。
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同方差性 homoscedasticity ; homogeneity of variances
同方差的 [数] homoscedastic
条件同方差 conditional homoskedasticity
同方差性扰动 homoscedastic disturbances
是条件同方差鞅差序列 martingale difference sequence
共同方法偏差 common method bias ; common method variance ; CMV
方差同质性 homogeneity of variance
共同方法方差 common method variance
同期协方差 contemporaneous covariance
然后在不同区域内分别采用不同方差的高斯函数进行轮廓平滑；
Then, the different kinds of zones are smoothed with Gaussian functions with different variance.
主要考虑了同方差型的半参数线性回归模型中参数的随机加权最小二乘估计（RWLSE）。
The randomly weighted least square estimator (RWLSE) for the parametric component in semi-parametric regression models was mainly discussed.
对因子设计而言，现已有若干种不同方法来估计实验误差方差。
For fractional factorial designs several different approaches to estimate this variance have been suggested.
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