overarching sampling

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• 1) simple random sample 2) stratified sampling 3)systematic random samples 4) cluster sampling 5)multistage samples.
• 英语翻译Probably he had come down in the world and this sampling was all that was left him from the time when he could afford to come and select his favorite pudding.我不太看得懂,特别是后面部分,from the time when .是从他有能力去买选择布丁的以后 还是 时候啊 这是 大学英语精读 第一册 第七课 THE SAMPLER 的一段 left 是留给的意思
• 英语翻译文章主要是讲social media data的优缺点当其用在科学研究中的时候.在优点部分里主要是说social media data 数量很多而且容易搜集,这里有句话不懂什么意思：Ease of collection means that researchers can often get data on entire populations.An entire population of Tweets or email-messages can be collected with no sampling required.There are no issues of biased respodent selection or assembling a sampling frame.
• 英语翻译Comprehensive assessments of Paraguay's forest cover (FC) change from the 1970s to the 2000s using Landsat observations were conducted,including a wall-to-wall mapping of changes across the whole country between the 1990s and 2000s,and an assessment of forest area in the Atlantic Forest ecoregion in the 1970s using a systematic sampling approach.
• 英语翻译The sampling error for this study is plus or minus1.5 percent for questions asked of everyone in the sample and plus or minus 2.5 percent for information collected only form those who have had prior Internet access.
• 英语翻译文章主要是讲social media data的优缺点当其用在科学研究中的时候.讲缺点的时候有这样一句话：We will begin by talking about sampling problems.A sampling frame is often impossible to creat.Except in certain limited circumstances it is possible to get a definitive list of email addresses,web pages,etc.This means that no unbiased sample is possible and most samples using NSM are convienience samples.
• 英语翻译where the subscripts k and k+1 indicate the current and next sampling times.Eq.(3) describes the relationship between the parameter u and the sampling time T.However,two terms u；k and uk must be expressed more explicitly.The constant feedrate V along the curve is defined as the derivative of the constant distance c with respect to time t.
• what`s sampling frame?
• Two overarching principles underlie the development of these reporting standards:the sufficiency o
• 英语翻译The next reference position can be obtained by substituting the determined uk+1 value into Eq.(1),which provides a constant feedrate machining.The real-time interpolating accuracy depends on the machining feedrate,system sampling time,and the part curvature radius.The error between the desired curve and the interpolated trajectory is the contour error,which represents the interpolation accuracy.Fig.6 shows the contour error caused by the interpola
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