查询词典 proportional sampling

Investigation indicates that the error of frequency estimation is proportional to the sampling rate, while that of initial phase independent of it.

研究表明频率估计的误差在采样点数确定时正比于采样率，而初相估计的误差则不受采样率的影响。

A total number of 2,422 people who were extracted by Stratified cluster sampling design and Probability Proportional to Size were used.

其中自北部机构有592人，中部机构有576人，南部机构有646人，东部机构有187人，总样本数共为2001人。

Utilizing probability proportional to size sampling method, the study sampled 500 faculty members at 51 universities in Taiwan.

针对台湾51所一般大学教师依多阶段抽样进行问卷调查，共发出500份，问卷回收338份，有效问卷335份，回收率66.4％。

Methods Proportional probability sampling method was used to randomly sample 1 200 pupils from 30 counties in Henan Province.

方法采用人121比例概率抽样法分阶段抽样。

According to the principle of proportional allocation,a three-stage sampling survey was set up.

应用按比例抽样原理，建立三级抽样框，抽样比为15％的问卷抽样调查。

Methods Proportional to Size Sampling method was employed and face to face interview was used to collect the information.

采用分层、三阶段与规模成正比的抽样方法获得调查对象，调查员入户面对面进行问卷调查。

Methods Population Proportional to Size sampling method was employed in sampling.

方法2005年11~12月采用分层、三阶段与规模成正比的容量比例抽样方法获得调查对象，采用统一调查问卷由统一培训的调查员入户进行面对面调查。

After probabilities proportional to size sampling, 1422 students and 2737 their parents were included in this study. Occupational history, history and risk factors of hypertensive diseases were collected by questionnaires.

以随机抽样的方式，从台北市的全体国中学童产生样本，共获得1422位学生和2737位学生父母亲为研究样本，探讨其职业与高血压性疾病的相关资料。

The survey conducted in Taiwan was designed using a multiple-stage sampling method that utilized the principles of probabilities proportional to size, stratified sampling, and systematic sampling to strengthen the sample's effective representation.

为符合研究的需要，本次研究的抽样方法采取较复杂的多阶段抽样法，主要应用「抽取率与单位大小成比例」原则，结合分层抽样、等距抽样等抽样方法的优点，以求提高样本代表性。

Circuit simulation and chip testing results show that when the LED driving current is 350 mA and the power supply is 6 V with ±10% variation, the stability of the output constant current of the accurate proportional current sampling mode LED driving IC will show 41% improvement over that of a traditional proportional current sampling mode LED driving IC.

经电路仿真及流片测试，表明当LED驱动电流为350mA，电源电压6V并正负波动10%时，改进的精密比例采样模式LED驱动电路比传统比例采样模式LED驱动电路的恒流特性稳定度提高了41%。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。