R语言玩数据抽样教程

玩数据中，数据抽样是常用要领和重要手段，通过从总体数据中抽取一个子集，按照子集的特性去预计总体的特性。<br /> 本文总结R语言玩数据抽样的要领。</p> <p>![](http://img.shujuren.org/pictures/61/59e9f71eed3e8.png)</p> <p>最简朴和常用的要领就是利用sample函数，它可以对一个向量做随机抽样。</p> <p>函数形态：</p> <p>“`<br /> sample(x, size, replace = FALSE, prob = NULL)<br /> “`</p> <p>参数描写：</p> <p>x-方针工具<br /> size-抽样的数量<br /> replace-是否放回抽样，默认值是FALSE，暗示不放回抽样<br /> prob-抽样的概率向量配置</p> <p>举例说明：</p> <p>“`<br /> x <- 1:10<br /> ## 不放回抽样<br /> set.seed(100)<br /> sample(x, 8)<br /> ## 有放回抽样<br /> set.seed(100)<br /> sample(x, 8, replace = TRUE)<br /> “`<br /> 功效<br /> 4 3 5 1 9 6 10 2<br /> 4 3 6 1 5 5 9 4<br /> 配置随机种子，保重尝试的可反复性。</p> <p>若是需要针对矩阵框，随机抽取一些样本，如何实现呢？<br /> 可以先随机获取这些样本行号，然后操作这些行号获取对应的样本。</p> <p>举例说明<br /> “`<br /> data(iris)<br /> set.seed(100)<br /> sample.row <- sample(1:nrow(iris), 10)<br /> sample.row<br /> sample.iris <- iris[sample.row, ] View(sample.iris)<br /> “`<br /> 功效<br /> ![](http://img.shujuren.org/pictures/9A/59be7899be604.png)</p> <p>至于更巨大的抽样，例如说分层抽样，整群抽样，最大熵抽样，可以在**sampling包**中找到相应要领实现。</p> <p>您在阅读中，有什么发起可能想法，请参加评论。<br /> 想插手圈子，请加微信。</p> </div> </article> <div class="tagcloud"><ul class='wp-tag-cloud' role='list'><h3>关键字：</h3> </ul> </div> <div class="col-sm-6 col-box bg-gray-light-2 contact-form"> <div role="form" class="wpcf7" id="wpcf7-f17097-o1" lang="zh-CN" dir="ltr"> <div class="screen-reader-response"></div> <form action="/r%e8%af%ad%e8%a8%80%e7%8e%a9%e6%95%b0%e6%8d%ae%e6%8a%bd%e6%a0%b7%e6%95%99%e7%a8%8b/#wpcf7-f17097-o1" method="post" class="wpcf7-form" enctype="multipart/form-data" novalidate="novalidate"> <div style="display: none;"> <input type="hidden" name="_wpcf7" value="17097" /> <input type="hidden" name="_wpcf7_version" value="5.1.3" /> <input type="hidden" name="_wpcf7_locale" value="zh_CN" /> <input type="hidden" name="_wpcf7_unit_tag" value="wpcf7-f17097-o1" /> <input type="hidden" name="_wpcf7_container_post" value="0" /> </div> <p><label> your的邮箱 (必填)<span class="wpcf7-form-control-wrap 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