对象与方法：研究对象采取分层整群随机抽样的方法，在大连市4所高校大一、大四年级学生中发放问卷800份，收回有效问卷726份。
Methods: By using questionnaires with multistage stratified random cluster sampling method, 726 valid questionnaires of 800 were backed from the university students in 4 universities in Dalian city.
方法对安徽省四县市的12岁及15岁儿童的龋病发病情况进行抽样调查，采用分层、不等比、多阶段整群抽样的方法。
Methods The survey of prevalence of dental caries in group aged 12 and 15 years in Anhui province was conducted using the non-proportional, stratified, cluster sampling method.
第四章陈述本文所从事的研究，介绍研究方法、目标、工具和所抽样例的原则与过程。
Chapter Four gives an account of the current study on teacher-initiated portfolios. It describes methodology in terms of objectives, sample portfolios and instruments.
方法通过等距抽样方法将样本试卷及四个年级的成绩输入电脑，利用分析软件进行分析。
Methods Through the systematic method to sample papers and four-year results entered into the computer by using software for analysis.
方法采取分层整群随机抽样的方法，对市内四个区11所学校的2 2 0 4名12～21岁的在校学生进行不记名问卷调查。
Methods A sample survey based on stratified probability samples of 2 204 students aged 12~21 years old among 11 schools in four districts of Shanghai was carried out.
给出了四维坐标变量的几率密度函数公式，并简述了相应的抽样方法。
The probability function for the four dimensional new variables are derived and the sample procedures f…
方法采用分层整群抽样方法，抽取马钢公司四个工厂共1992名职工进行脂肪肝的流行病学调查。
Methods a stratified sampling study on the epidemiological feature of fatty liver was conducted among 1992 workers from 4 factories of Ma 'anshan iron and steel general company.
方法采用分层整群抽样方法，抽取马钢公司四个工厂共1992名职工进行脂肪肝的流行病学调查。
Methods a stratified sampling study on the epidemiological feature of fatty liver was conducted among 1992 workers from 4 factories of Ma 'anshan iron and steel general company.
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