查询词典 stratified

Methods A questionnaire survey on QOL was conducted to a clustered stratified sample of 2036 students of rural or urban to Hubei.

采用分层整群抽样方法，对湖北省城乡中小学生2036名利用《儿童少年生活质量量表》进行生活质量测查。

Methods By using health related behaviors questionnaire for Chinese youths, a stratified sample of 5158 students from 12 junior middle schools in 4 cities in Henan Province were surveyed. The influencing factors were analyzed.

采用分层整群抽样方法，抽取河南省4个省辖市12所初中的5158名学生，应用中国疾病预防控制中心制定的"中国青少年健康相关行为调查问卷"进行调查，并对影响因素进行分析。

Objective To analyze depression, anxiety and the related psychological social factors, and to provide evidence for the prevention of mental diseases and mental health education. Methods A cluster stratified sample of 509 medical college students were questionnaired on epidemic features and the related factors of depression and anxiety.

目的 分析医学生抑郁、焦虑情绪症状及其相关的心理社会因素，学生心理疾病防治和健康教育工作提供依据方法分层整群抽取某医科大学本科生509名进行抑郁、焦虑情绪的流行特征及其相关因素调查分析。

The sample was stratified by farm size (250-499, 500-999, and 1000 or more acres), and telephone follow-up was used to limit non-response bias.

该样本是由农场规模（250-499，500-999，1000亩以上的分层），电话随访用来限制非反应偏差。

Methods A cluster stratified sample of315undergraduates were investigated with a closed questionnaire,and301questionnaires were available.

采用分层整群抽样法，抽取贵州省在校大学生315名进行无记名封闭式问卷调查，获得有效问卷301份。

Therefore, in order to learn the basic situation of the "two-course" teaching, especially to learn the students" recognition and valuation of the "two-course, this paper surveyed 1200 students in different sex, grade and major, who were selected by stratified sample method in Wuhan University.

大学生认为有必要开设"两课"，而且"两课"教学内容与中学相关教育内容的衔接情况良好，对大学生思想政治观念的形成和今后的发展有一定的帮助；但他们对是否可以通过课堂形式进行思想政治教育的问题存在较大的分歧。

Methods A stratified cluster sample of1007college students were questionnaired.

采用分层整群抽样的方法，对广州市1007名大学生进行问卷调查。

Methods A cluster random stratified sample of404medical college students were investigat-ed with a self-administered questionnaire.

采用分层整群抽样方法对404名医学生进行自填问卷调查。

Nalytic methods based on elementary parametric and non-parametric models for one sample; two sample, stratified sample, and simple regression problems

-1 B-3 2如何搜集有价值的资料？如何组织、解释所搜集的资料？如何分析并给适当的推论？

To further reduce the time pressure for a larger training data set, the algorithm creates a smaller training data set via the primary model based on a stratified sample.

为进一步减小较大规模训练数据集的回归时间压力，算法对训练数据集的分层采样建立了初步模型，进而产生实际较小规模的训练数据集。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失