stratified sampling是什么意思，stratified sampling的意思翻译、用法、同义词、例句
常用词典
[统计] 分层抽样，[统计] 分层取样；成层抽样
例句
METHODS an investigation was made by cluster and stratified sampling method.
方法采用多阶段分层整群抽样方法入户调查。
Stratified sampling can reduce the sampling error associated with simple random samples.
分层抽样可以减少由简单随机抽样造成的抽样误差。
Methods: The stratified sampling and cluster random sampling methods are used in this survey.
方法：本研究采用分层随机抽样方法和整群随机抽样方法。
Methods With stratified sampling and cluster sampling, we investigate 487 families in poverty.
方法采用分层整群抽样方法调查487户贫困家庭。
Methods A large-scale survey was conducted at 250 medical health units based on stratified sampling.
方法使用分层抽样的方法在全国范围内抽取250家医疗机构开展大规模调查。
网络扩展资料
Stratified sampling is a statistical technique used to obtain representative samples from a population. It involves dividing the population into subgroups or strata based on certain characteristics and then selecting samples from each of these strata.
Usage and Explanation
Stratified sampling is used when the population is heterogeneous and the researcher wants to ensure that the sample is representative of the entire population. In this method, each stratum is treated as a separate population, and a sample is drawn from each stratum. The sample size for each stratum is proportional to the size of the stratum in the population. This ensures that each stratum is represented in the sample in proportion to its size in the population.
For example, if a researcher wants to study the income levels of a city's population, they may divide the population into strata based on income levels (e.g., low-income, middle-income, high-income). They would then randomly select a sample from each of these strata to ensure that the sample represents the entire population's income distribution.
Examples and Synonyms
- Example: A company wants to determine the satisfaction level of its customers. They divide their customer base into strata based on demographics, such as age, gender, and income. They then select a random sample from each stratum to ensure that the sample accurately represents the entire customer population.
- Synonyms: proportionate sampling, quota sampling, representative sampling
Antonyms
The opposite of stratified sampling is simple random sampling, where every member of the population has an equal chance of being selected for the sample, regardless of their characteristics or stratum.
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