Pooled VarianceThe pooled variance is used to estimate the value of the variance of two or more populations when the respective variances of each population are unknown but can be considered as equal.Springer New YorkConcise Encyclopedia of Statistics...
The pooled estimate of variance is typically expressed as the square of the standard deviation. This means that a smaller pooled estimate of variance indicates less variability within the population, while a larger estimate indicates more variability. It is important to consider the context of the...
试题来源: 解析 B B is correct. The assumption that the variances are equal allows for the combining of both samples to obtain a pooled estimate of the common variance.【释义】方差相等的假设允许合并两个样本来获得共同方差的合并估计。反馈 收藏 ...
网络联合方差估计;合并方差估计法;方差预计法 网络释义
Under the assumption of equal population variances, thepooledsamplevariance provides a higher precision estimate of variance than the individual sample variances. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. ...
5.2.5 The Pooled Variance Estimate The estimate of a common variance from two independent samples is obtained by “pooling,” which is simply the weighted mean of the two individual variance estimates with the weights being the degrees of freedom for each variance. Thus the pooled variance, de...
The larger the sample size, the greater the proportional effect will be on the overall estimate of the standard deviation. Here is the generalized formula for it: The formula for pooled standard deviation In the formula above, n is the sample size of the group, S squared the group ...
The role of diet quality on malnutrition in older adults is uncertain, due the paucity of the research conducted and the use of use of screening tools that did not consider phenotypic criteria of malnutrition. Objective To evaluate the association of two indices of diet quality, namely the Medit...
In principle, Pool-seq should give more robust estimate of AF due to the larger sample size, which allows decreasing the overall variance of the estimated AF6. This hypothesis is well supported by mathematical models under the assumption that there are no sequencing errors and each individual ...
Thus, we used the genetic twin design to estimate the genetic correlations of BMI from infancy to adulthood and compared them to the genetic correlations of height. Methods We pooled individual level data from 25 longitudinal twin cohorts including 38,530 complete twin pairs and having 283,766...