查询词典 sample size

Investigates the survey manner,sampling method and calculation of sample size.

就调查方式、抽样方法和样本容量的计算进行了探讨。

This paper built water quality assessment model based on some basic introduction to PP. It made several conclusions as follows: PP model was stable when sample size was no less than 20. It run much faster when the range of projection vector was constrained between 0 and 1. Accelerated genetic algorithm should be recommended because of its unique advantages. Using scatter diagram of making comparison directly was more convenient than using regression model.

该文在介绍该模型基本计算步骤的基础上，经建模分析，得出：各评价等级取值范围内样本个数不小于20即可具有较好的稳定性，投影向量分量的取值范围为[0，1]时更有利于提高计算速度，选用加速遗传算法寻优时间更短，使用图解法或直接比较法更为方便和快捷。

The minimum sample size approach could be used for routine surveillance and sequential sampling approach could be used for early warning.

前者可用于日常监测，后者可用于早期预警。

Objective: To provide a minimum sample size approach and a sequential sampling approach for testing whether the sporozoite rate has exceeded the critical level of malaria epidemics using the pool sampling method.

目的：给出基于混合样本的最小检测次数法和序贯检验法，以检验子孢子阳性率是否超过导致疟疾流行的临界水平。

The simple random sampling plan and stratified random sampling plan has been introduced and the application means and effects of which also has been presented,it has some characteristics such as material precision and obvious reduce of sample size,and rational advice has been presented.

介绍了简单随机抽样和分层随机抽样方法及其在检测中的应用方法和效果。

Here, using the mathematica software and the outcome of the computation , we can see which interval is better easily. In chapter 2, the author firstly studies three two-stage simultaneous confidence intervals for the pairwise treatments with the same precision and reliability in a balance one-way classification model ,then work out the optimal sample size of the first stage by numerial computation.

第2章作者讨论了平衡单向分类模型中，成对效应对照的三种两步同时置信区间，接着在保证三种区间可靠度和精度相同的情况下，利用数值计算的方法对最优第一步抽样量及平均抽样次数进行比较。

The comparison error rate of LSD and Duncan is equal toα, but their experimental error rate is large toα. The comparison error rate of SNK, Scheffe, Bonferroni, Sidak are smeller toα, as well as experimental error rate. The power of test of SNK, Scheffe, Bonferroni, Sidak are smeller to LSD and Duncans. When unbalance design with small sample size, the power of SNK, Scheffe, Bonferroni, Sidak are little small.

LSD检验、Duncan检验的比较错误率接近检验水准，但二者的实验错误率远远大于检验水准；SNK检验、Scheffe检验、Bonferroni检验、Sidak检验的比较错误率和实验错误率均小于检验水准，但这三种方法对均数的敏感度不及LSD检验和Duncan检验；正态分布方差齐各组不均衡且为小样本时，Scheffe检验、Sidak检验、Bonferroni检验的β_2，值均较大。

Electronic energy and wave function of three-layer spherical nanometric system in homogeneous electric field is solved, the influence of applied field and sample size to the shift of Stark energy level is discussed.

求出均匀外电场作用下三层球状纳米系统电子的能量和波函数，讨论了外电场和样品线度对斯塔克能级移动的影响

Therefore, research on non-statistical evaluation of measurement uncertainty with small sample size and unknown statistical distribution has important theoretical significance and practical value.

因此，研究小样本量、未知分布下的测量不确定度的非统计评定理论具有重要的理论意义和实际价值。

Based on the interval hypothesis, statistical procedures were proposed and the methods for sample size determination are also given.

比较传统假设检定、区间假设检定等五种方法，以模拟的方式得到经验的整体型一错误、平均型一错误以及检定力模拟结果显示，区间假设可以有效的控制平均型I 误差在名目水准之下，且整体型一误差也比较低，检定力相较於使用Bonferroni修正来的好。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。