1) block quadrat analysis
聚块样方方差
2) BQV and PQV
样方方差法
1.
The BQV and PQV methods were used to analyze the pattern of spatial distribution of Scotch pine in the sandy area in Northeast China.
采用区组样方方差法(BQV)和成对样方方差法(PQV)对红花尔基沙地樟子松的空间分布格局进行了研究,结果表明:该地区沙地樟子松林的空间分布格局呈集聚型,其天然林聚块之间的距离为 320~400m,为进一步研究樟子松的种群生长动态提供了依据。
3) sample variance
子样方差
1.
in this paper we give sufficient and necessary conditions that sample avarages and sample variances .
本文给出了分别取自总体和的两个相互独立的样本的子样均值与子样方差相互独立的充要条件。
4) Sampling variance
抽样方差
1.
By the derivations and comparisons of Sampling Variance formulas under the different Sampling Methods,it is proposed that Sampling Method depend upon two parameters:heteroskedasticity r and intercept α.
本文通过对不同抽样方法下抽样方差计算公式的导出与比较,认为抽样中应采用何种抽样方法取决于两个参数异方差测度r和回归截距项α,并提出了这两个参数的事前估算方法。
5) sample variance
样本方差
1.
Acquired conclusion was that the sample mean value submitted to normal distribution, and the sample variance was composed of a number of linear sum of random variable submitted to Chi-Squared distr.
得出的结论是:样本均值服从正态分布,样本方差由若干个服从卡方分布的随机变量的线性之和组成;样本均值的期望等于各管落点期望的算术平均值,方差为各管方差的算术平均值;样本方差是各管落点总体平均方差的无偏估计,方差与各管落点散布的差异相关;样本均值与方差相互独立的充要条件是:各管落点属于独立同分布样本。
2.
The estimators of functions G(t) and F(t) are extended to function J(t) and the comparative study is made,including the comparison of biases,sample variances and maximal bias.
文章把关于G(t)和F(t)的估计扩展到J(t)并对其进行了比较研究,包括偏差、样本方差和最大偏离的比较。
3.
In view of this situation, taking the samples from the entrance exam papers of art for higher education in He′nan Province in 2000 and the sample variance method and relative frequency method were used to evaluate the accuracy and stability of grading, moreover, the curve line of errors has been formed.
针对主观评分过程中存在的评分误差问题 ,从 2 0 0 0年河南省高等学校招生美术专业统考试卷中抽取样本 ,采用样本方差法与频率法对评分准确度及稳定性进行了描述与评价 ,并建立评分误差曲线 。
6) sample variance
试样方差
补充资料：块聚
1.谓凝结成块。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条