{"version":"1.0","provider_name":"Code and Stats","provider_url":"https:\/\/blog.hwr-berlin.de\/codeandstats","author_name":"Markus L\u00f6cher","author_url":"https:\/\/blog.hwr-berlin.de\/codeandstats\/author\/loecher\/","title":"Grouping Duplicates - Code and Stats","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"b3KA8FSYt9\"><a href=\"https:\/\/blog.hwr-berlin.de\/codeandstats\/identifying-duplicates\/\">Grouping Duplicates<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/blog.hwr-berlin.de\/codeandstats\/identifying-duplicates\/embed\/#?secret=b3KA8FSYt9\" width=\"600\" height=\"338\" title=\"&#8220;Grouping Duplicates&#8221; &#8212; Code and Stats\" data-secret=\"b3KA8FSYt9\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/blog.hwr-berlin.de\/codeandstats\/wp-includes\/js\/wp-embed.min.js\n<\/script>\n","description":"Both base R and data.table offer their duplicated() functions which are useful if your main goals is to identify and possibly delete duplicates. For example BirthDay &lt;- as.Date(c(rep(&quot;1970-08-08&quot;,2), &quot;1950-03-01&quot;, &quot;1963-12-10&quot;,rep(&quot;1968-10-18&quot;,2))) HomeTown = c(rep(&quot;New Brunswick,NJ&quot;,2),&quot;Springfield,OH&quot;,&quot;Buffalo,NY&quot;,rep(&quot;Portland,OR&quot;,2)) df &lt;-data.frame(BirthDay,HomeTown) duplicated(df) ## [1] FALSE TRUE FALSE FALSE FALSE TRUE df[duplicated(df), ] ## BirthDay HomeTown ## 2 1970-08-08 New Brunswick,NJ &hellip; Continue reading"}