Methods : 2502 residents above 15 years old were selected and studied through random sampling methods in beijing 方法:采用隨機(jī)抽樣方法對(duì)北京市人口15歲以上的2502人進(jìn)行流行病學(xué)調(diào)查。
In order to study the awareness , treatment and control rates andthe risk factors of hypertension in qingdao rural residents , a cluster random sampling method was used 為了調(diào)查青島農(nóng)村居民高血壓的患病率、知曉率、服藥率、控制率及其影響因素,采用整群隨機(jī)抽樣法,對(duì)7個(gè)村的18歲以上居民進(jìn)行血壓測(cè)量及相關(guān)因素調(diào)查。
This paper deals with the problem of non - uniform weed numbers obtained with all types of random sampling methods , discussing the importance of statistical control methods in herbicide efficacy evaluation and showing pertinent calculations 針對(duì)隨機(jī)取樣中的各樣方內(nèi)雜草數(shù)目不一致問(wèn)題,討論了統(tǒng)計(jì)控制方法在除草劑藥效評(píng)價(jià)中的重要性以及計(jì)算過(guò)程。
The questionnaires were given to rafters , in siaokuluan and lao - nong river , and non - random sampling method is used . 292 effective questionnaires were collected by siaokuluan river , 325 by lao - nong river 本研究采問(wèn)卷調(diào)查的方式,對(duì)象為參與花蓮秀姑巒溪及高雄?濃溪泛舟之游客,并于兩條溪流泛舟終點(diǎn)采便利取樣方式進(jìn)行調(diào)查,時(shí)間從2005年8月至9月于周休二日假日時(shí)實(shí)施。