Methods:From 1987 to 1992,hospital-based cluster sampling method was adopted for collecting data.

采用以醫(yī)院為基礎(chǔ)的監(jiān)測(cè)方法收集資料。

A total of 15 838 nationally representative subjects aged 35 to 74 were selected with multistage cluster sampling.

共調(diào)查了35～74歲的成年人15 838人丰满的人妻一级毛片中文。

The samples were collected by way of cluster sampling and 798 were available.

統(tǒng)計(jì) 本論文已被瀏覽 202 次国产精品理论片在线播放，被下載 17 次

Methods Stratified random and cluster sampling methods were employed in this study.

正確使用安全、可靠的避孕方法是降低意外妊娠的關(guān)鍵人人插视频激烈。

Methods Cluster sampling method was used in the 717 persons aged 60 and over in Yanjiao Developing Area.

采用整群抽樣方法對(duì)河北省燕郊年齡≥ 6 0歲 717名老年人進(jìn)行問卷調(diào)查XxXxVIDeos绝顶高潮。

Cluster sampling：整群抽樣

(4) 整群抽樣(cluster sampling) 此法是一種以包含若干個(gè)體的單位群為抽樣對(duì)象的抽樣方法. 其具體作法是:首先對(duì)所調(diào)查總體按需要?jiǎng)澐殖扇舾蓡挝蝗?并對(duì)各群進(jìn)行編號(hào),然后用簡(jiǎn)單隨機(jī)抽樣法在總體中抽單位群來(lái)組成樣本.

Cluster sampling：群集抽樣法

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Cluster sampling：群集抽樣

6.群集抽樣(Cluster Sampling)在本法抽樣是以隨機(jī)選出一群,一群為單位,不是個(gè)別單位. 群集抽樣之優(yōu)點(diǎn)簡(jiǎn)便易行,經(jīng)濟(jì)省事. 但是易產(chǎn)生抽樣誤差危險(xiǎn)性很大. 分層之基礎(chǔ)有賴抽樣設(shè)計(jì)者之經(jīng)驗(yàn)及判斷. 理想上分層之?dāng)?shù)目愈多愈好. 因?yàn)閷訑?shù)愈多,

Cluster sampling：集群取樣

研究發(fā)現(xiàn)閱讀理解能力高的學(xué)生比一般或低閱讀理解能力的學(xué)生,會(huì)作更多的邏輯推理(Winne,(二)正式評(píng)量卷的研究對(duì)象:本研究以大臺(tái)北地區(qū)之國(guó)小五年級(jí)、國(guó)中一年級(jí)和高中二年級(jí)學(xué)生為母群體,采隨機(jī)取樣(Random sampling)與集群取樣(Cluster sampling)的方式進(jìn)行抽樣.

Simple cluster sampling：簡(jiǎn)單整群抽樣

Significant figure,有效數(shù)字 | Simple cluster sampling,簡(jiǎn)單整群抽樣 | Simple correlation,簡(jiǎn)單相關(guān)