| 词汇 | 抽样 |
| 释义 | 抽样 Sampling variability explains only a portion of the overall uncertainty in a modelled estimate. Sampling issues: clarity about the source and representativeness of samples of evidence that your audience and you are using to form inferences and draw conclusions. And the CDC has a network of physicians who routinely sample and test patients to see what bugs they have and might be circulating in the community. It is best practice to have the filter conditions in virtual tables or the analysis settings of the data source instead of using sampling to reduce the execution time of a rule. However, these differences are not statistically significant from a sampling standpoint and, if real, would be rather minor in any meaningful effect on welfare programs. In addition to sampling error, question wording and practical difficulties in conducting surveys can introduce error or bias into the findings of public opinion polls. But preparing the sample can take more than a day, and the equipment to do that costs almost as much as the sequencer itself. A second reason is the massive growth of credit derivatives, which has given investors the ability to sample the debt markets so as to get exposure to the precise risks they find attractive. What kind of sampling procedure do you use? You can specify additional options about the scheduling and sampling to use, as well as engine specific options in the XML task. Most statisticians would not argue if you decided to reject the null hypothesis that the results can be accounted for in terms of random sampling variability from the null distribution. If indexes are available, then the sampling is improved. The population sampling survey, conducted by Shanghai Municipal Statistics Bureau, reveals a rapid rise in the size of the unmarried population, especially women. Though the sample was small, the team found no significant difference between the two groups other than brain size. All reported margins of sampling error include the computed design effects for weighting and sample design. They also sampled tissue from deer killed by hunters in the same area, to get an idea of the infection rate in the general population. With data sampling, only a subset of the data is scanned. Row level sampling reads all data pages but considers only a percentage of the rows on each page, and therefore only a subset of the corresponding XDA pages. To reduce execution time, unless the rules are columnar, you should use virtual tables where possible, and avoid using sampling. Thus, page sampling can significantly improve performance if your table contains not just XML but also a fair amount of relational data. For that, go to the sample surveys that India carries out more often. The uncertainty owing to both the sampling variability and the choice of models should be given when disease burden results are presented. In1997, top tennis star Andre Agassi was found during routine urine sampling to have traces of crystal meth in his system. This is a simple example of a Pareto diagram using sample data showing the relative frequency of causes for errors on websites. Instead of getting a random sample, your poll will reflect the activist groups' organizational skills and energy level. Page level sampling reduces I/ O significantly since it reads only a percentage of the data pages. |
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