本文提出了信息价值的问题，并给出了抽样信息价值的评价方法。
In this paper, the problem about information value is proposed, evaluation method of sampling information value is given.
另外，通过对该模型抽样信息价值的考察，从经济角度证实了其可行性与必要性。
In addition, by reviewing the indexes of information value this model is also feasibility and necessary on the view of economy.
本文讨论了贝塔分布共轭于二项分布的决策模型下的二行动线性决策问题的抽样信息期望值的计算公式。
In this paper we discuss the counting formula of the expected value of sampling information for linear decision problem on two actions under the Be - b model.
可以用内部算法来比较新收集的统计信息与已保存的一组统计信息，并基于某些触发条件发出包含抽样的RUNSTATS。
An internal algorithm is used to compare newly collected statistics with a saved set of statistics, and RUNSTATS with sampling is issued based on certain conditions being triggered.
第三个命令抽取 15%的行，但是不收集分布统计信息，并对索引也应用了抽样，这不同于第一个命令和第二个命令。
The third command samples 15% of all rows, does not collect distribution statistics, and also applies sampling to indexes which the first and second commands didn't.
但是，如果关系数据值是高度聚集的，那么行级抽样可以产生更精确的统计信息。
But, row level sampling may produce more accurate statistics if relational data values are highly clustered.
总之，统计信息的准确性取决于抽样率、数据倾斜(data skew)以及用于数据抽样的数据群集。
In summary, the accuracy of statistics depends on the sampling rate, the data skew, and data clustering for data sampling.
收集索引上的详细抽样统计信息和表的分布统计信息。
Example 28. Collect detailed sampled statistics on indexes as well as distribution statistics for the table.
收集两个索引上的详细目录统计信息，但对每个索引条目使用抽样来代替执行详细的计算。
Example 27. Collect detailed catalog statistics on both indexes, but use sampling instead of performing detailed calculations for each index entry.
第一个runstats命令为表customer和它的所有索引收集最全面、最详细的统计信息，而没有采用抽样。
The first runstats commands collects the most comprehensive and detailed statistics for the table customer and all its indexes without sampling.
收集扩展的索引目录统计信息，指定使用抽样。
Example 38. To collect extended index catalog statistics specifying that sampling should be used.
所包含的文件Distribution . php包含了为几个常用的抽样分布(t分布、f分布和X平方分布)生成抽样分布统计信息的方法。
The included file, Distribution.php, contains methods that generate sampling-distribution statistics for several commonly used sampling distributions (Student t, Fisher f, Chi Square).
讨论了等距抽样中，如何利用辅助信息改进总体平均值的估计，以达到提高估计精度之目的。
This paper deals with the estimation of population mean in systematic sampling by use of auxiliary information in order to improve the accuracy of the estimate.
在随机模拟的基础上引入经验模拟方法，可代替大量实际抽样，能够节省样本容量，扩展样本信息。
The experienced simulation model is introduced on the basis of random model. It can replace a lot of samples, can economize the capacity of samples and can expand information of samples.
例如，在泰国，只有三分之一的抽样食品在外包装上标注食品成分和有关营养方面的信息。
Just one third of the sample in Thailand, for example, managed to provide adequate nutritional information on their packaging or list ingredients.
方法采用分层随机抽样的方法，对东部沿海某市18~60岁外来务工人员进行问卷调查，收集艾滋病知识和行为的信息，并采集静脉血进行艾滋病病毒抗体检测。
Methods The migrant workers aged 18~60 in one east city were chosen by stratified random sampling, and surveyed by a questionnaire about knowledge, behavior of AIDS, and blooded to test HIV antibody.
从信号中去除高频信息，降低抽样频率而不导致频谱混叠的过程称之为抽取。
Filtering the high frequency part of the signal and reducing the sampling frequency, which does not produce the aliasing, is called sampling.
提出了在林业信息资料的抽样调查中、最优样本轮换率的问题。
The question of the best rate of the sample book's rotation in the sampling survey of forestry information material is arisen.
校正估计法已被大量运用于抽样调查中，它利用辅助信息构造的校正权重提高了对总体总值(或均值)的估计精度。
Calibration estimation which USES known auxiliary information at the estimation stage to improve the precision of the estimators of totals and means has been widely used in survey sampling.
抽样程序宜对取自某个物质、材料或产品的一个或多个样品的选择、抽样计划、提取和制备进行描述，以提供所需的信息。
NOTE 2 Sampling procedures should describe the selection, sampling plan, withdrawal and preparation of a sample or samples from a substance, material or product to yield the required information.
通过对安徽师范大学1000多名本科毕业生的抽样调查表明：毕业生择业的主要途径是人才市场和各种招聘信息；
A sample survey of 1000 four-year students graduating from AnhuiNormal University indicates: Graduates go job-hunting mainly through human resources markets and job ads.
结果表明，传统目标抽样法将丢失大量信息，改进技术在保持完整性的同时降低约一半负载。
The sizes of autonomous systems (AS) were investigated with the IP2AS technique. The results showe that lots of information is missed by the traditional method;
方法按分层整群抽样的方法抽取样本，并通过问卷调查的方式收集有关广东省18岁以上居民的伤害信息。
Methods the study sample was got by multi-stage randomized sampling, and the injury information of the inhabitants aged over 18 years in Guangdong province was collected by questionnaire.
方法按分层整群抽样的方法抽取样本，并通过问卷调查的方式收集有关广东省18岁以上居民的伤害信息。
Methods the study sample was got by multi-stage randomized sampling, and the injury information of the inhabitants aged over 18 years in Guangdong province was collected by questionnaire.
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