In this paper it not only gives the method of unequal probability in group sampling and unbiassedness of mean estimation and also gives the variance and its unbiassedness of estimation.
本文给出了集团抽样的不等概方法和均值的无偏估计，同时也给出了这种估计的方差及方差的无偏估计。
The homogeneity variance and analysis of variance were compared in every group.
各组均数间比较方差齐性检验、方差分析。
The estimation of this class of the distributed group can be done by the unbiased estimation, uniformly minimum variance estimation and the optimal linear unbiased estimation.
这一类分布族的参数估计可用无偏估计，一致最小方差无偏估计和最优线性无偏估计。
Note :Variance stands for the variance of daily weight gain of each group and corresponding control group .
方差为各组日平均增重与相应对照组的方差。
Although having great variance in sequence, group I introns share a number of conserved base-paired regions, which take part in the formation of the catalytic structure.
型内含子的序列差异很大，但是它们都具有保守的碱基配对区，即保守的二级结构。
The incidence rate of residual neuralgia in the treatment group was significantly lower than that of the control group, the adverse reaction and efficacy was no significant variance(P > 0. 05 ).
结果治疗组症状和体征的改善时间比对照组短，其中以止痛时间缩短最为显著（P〈0．01），后遗神经痛发生率第一组明显低于第二组（P〈0．05），两组的疗效及不良反应发生率无显著性差别（P〉0．05）。
Predicted the cholesterol of 70 ~ 79 group and over 80 group according to posterior variance testing.
后验差检验合格，预测70 ~ 79岁、80以上年龄段的女性胆固醇。
Predicted the cholesterol of 70 ~ 79 group and over 80 group according to posterior variance testing.
后验差检验合格，预测70 ~ 79岁、80以上年龄段的女性胆固醇。
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