{"id":3887,"date":"2023-07-14T23:29:39","date_gmt":"2023-07-14T23:29:39","guid":{"rendered":"https:\/\/statorials.org\/nl\/zonder-een-lege-dataset-te-creeren\/"},"modified":"2023-07-14T23:29:39","modified_gmt":"2023-07-14T23:29:39","slug":"zonder-een-lege-dataset-te-creeren","status":"publish","type":"post","link":"https:\/\/statorials.org\/nl\/zonder-een-lege-dataset-te-creeren\/","title":{"rendered":"Hoe u een lege gegevensset maakt in sas"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Er zijn twee veelgebruikte manieren om een lege gegevensset in SAS te maken:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Methode 1: Maak een geheel nieuwe dataset<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #800080;\">data<\/span> empty_data;\n<span style=\"color: #3366ff;\">attrib<\/span> \n    var1 <span style=\"color: #3366ff;\">length<\/span> =8 <span style=\"color: #3366ff;\">format<\/span> =best12. <span style=\"color: #3366ff;\">label<\/span> =\" <span style=\"color: #993366;\">var1<\/span> \"\n    var2 <span style=\"color: #3366ff;\">length<\/span> =$30 <span style=\"color: #3366ff;\">format<\/span> =$30. <span style=\"color: #3366ff;\">label<\/span> =\" <span style=\"color: #993366;\">var2<\/span> \"\n    var3 <span style=\"color: #3366ff;\">length<\/span> =8 <span style=\"color: #3366ff;\">format<\/span> =best12. <span style=\"color: #3366ff;\">label<\/span> =\" <span style=\"color: #993366;\">var3<\/span> \"\n<span style=\"color: #3366ff;\">stop<\/span> ;\n<span style=\"color: #800080;\">run<\/span> ;\n<\/strong><\/span><\/pre>\n<p> <span style=\"color: #000000;\"><strong>Methode 2: Maak een lege dataset van een bestaande dataset<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #800080;\"><span style=\"color: #800080;\">d<\/span> <span style=\"color: #000000;\"><span style=\"color: #800080;\">ata<\/span> empty_dat<\/span> <span style=\"color: #800080;\">a<\/span> <span style=\"color: #000000;\">;\n<\/span><span style=\"color: #000000;\"><span style=\"color: #3366ff;\">set<\/span> existing_data;\n<\/span><span style=\"color: #000000;\"><span style=\"color: #3366ff;\">stop<\/span> ;\n<span style=\"color: #800080;\">run<\/span> ;\n<\/span><\/span><\/strong><\/span><\/pre>\n<p> <span style=\"color: #000000;\">Bij beide methoden voorkomt de <strong>stop-<\/strong> instructie dat SAS de rijen daadwerkelijk verwerkt.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Dit resulteert in een lege dataset met variabelenamen maar geen rijen.<\/span><\/p>\n<p> <span style=\"color: #000000;\">De volgende voorbeelden laten zien hoe u elke methode in de praktijk kunt gebruiken.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Voorbeeld 1: Maak een geheel nieuwe gegevensset<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">We kunnen de volgende code gebruiken om een lege dataset te maken met de naam <strong>empty_data<\/strong> die vier variabelen bevat:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #800080;\"><span style=\"color: #008000;\">\/*create empty dataset*\/<\/span>\ndata<\/span> empty_data;\n<span style=\"color: #3366ff;\">attrib<\/span> \n    employee_ID <span style=\"color: #3366ff;\">length<\/span> =8 <span style=\"color: #3366ff;\">format<\/span> =best12. <span style=\"color: #3366ff;\">label<\/span> = \" <span style=\"color: #993366;\">Employee ID<\/span> \"\n    employee_Name <span style=\"color: #3366ff;\">length<\/span> =$30 <span style=\"color: #3366ff;\">format<\/span> =$30. <span style=\"color: #3366ff;\">label<\/span> =\" <span style=\"color: #993366;\">Employee Name<\/span> \"\n    sales <span style=\"color: #3366ff;\">length<\/span> =8 <span style=\"color: #3366ff;\">format<\/span> =best12. <span style=\"color: #3366ff;\">label<\/span> =\" <span style=\"color: #993366;\">Sales<\/span> \"\n    sales_date <span style=\"color: #3366ff;\">length<\/span> =8 <span style=\"color: #3366ff;\">format<\/span> =date9. <span style=\"color: #3366ff;\">label<\/span> =\" <span style=\"color: #993366;\">SalesDate<\/span> \";\n<span style=\"color: #3366ff;\">stop<\/span> ;\n<span style=\"color: #800080;\">run<\/span> ;<\/strong><\/span><\/pre>\n<p> <span style=\"color: #000000;\">We kunnen vervolgens <strong>proc-inhoud<\/strong> gebruiken om de inhoud van de dataset weer te geven:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #800080;\"><span style=\"color: #008000;\">\/*view contents of dataset*\/\n<\/span><span style=\"color: #000000;\"><span style=\"color: #800080;\">proc contents<\/span> <span style=\"color: #3366ff;\">data<\/span> =empty_data;\n<\/span><\/span><\/strong><\/span><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-31311 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/vide1.jpg\" alt=\"\" width=\"637\" height=\"248\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">Uit het resultaat kunnen we zien dat de dataset vier variabelen heeft, maar geen waarnemingen, dwz nul rijen.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Onderaan het resultaat kunnen we ook de namen zien van de vier variabelen die we hebben gemaakt:<\/span> <\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-31312 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/vide2.jpg\" alt=\"\" width=\"399\" height=\"156\" srcset=\"\" sizes=\"auto, \"><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Voorbeeld 2: Maak een lege dataset van een bestaande dataset<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">We kunnen de volgende code gebruiken om een lege gegevensset te maken met de naam <strong>empty_data<\/strong> die wordt gegenereerd op basis van een bestaande gegevensset met de naam <a href=\"https:\/\/documentation.sas.com\/doc\/en\/pgmsascdc\/9.4_3.4\/statug\/statug_sashelp_sect010.htm\" target=\"_blank\" rel=\"noopener\">Comet<\/a> , een gegevensset die is ingebouwd in SAS:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008000;\">\/*create empty dataset from existing dataset*\/\n<\/span><span style=\"color: #800080;\">data<\/span> empty_dat;\n    <span style=\"color: #3366ff;\">set<\/span> sashelp.Comet;\n    <span style=\"color: #3366ff;\">stop<\/span> ;\n<span style=\"color: #800080;\">run<\/span> ;<\/strong><\/span><\/pre>\n<p> <span style=\"color: #000000;\">We kunnen vervolgens <strong>proc-inhoud<\/strong> gebruiken om de inhoud van de dataset weer te geven:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #800080;\"><span style=\"color: #008000;\">\/*view contents of dataset*\/\n<\/span>proc contents <span style=\"color: #3366ff;\">data<\/span> =empty_data;<\/span><\/strong><\/span> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-31313 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/vide3.jpg\" alt=\"\" width=\"644\" height=\"261\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">Uit het resultaat kunnen we zien dat de dataset vier variabelen heeft, maar geen observaties.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Onderaan de uitvoer kunnen we ook de namen zien van de vier variabelen die zijn gemaakt op basis van de bestaande dataset:<\/span> <\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-31314 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/vide4.jpg\" alt=\"\" width=\"492\" height=\"165\" srcset=\"\" sizes=\"auto, \"><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Aanvullende bronnen<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">In de volgende zelfstudies wordt uitgelegd hoe u andere veelvoorkomende taken in SAS kunt uitvoeren:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/nl\/kort-geding-procedure-in-sas\/\" target=\"_blank\" rel=\"noopener\">Procedureoverzicht gebruiken in SAS<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/sas-hernoemen-van-variabelen\/\" target=\"_blank\" rel=\"noopener\">Variabelen hernoemen in SAS<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/zonder-nieuwe-variabelen-te-creeren\/\" target=\"_blank\" rel=\"noopener\">Nieuwe variabelen maken in SAS<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Er zijn twee veelgebruikte manieren om een lege gegevensset in SAS te maken: Methode 1: Maak een geheel nieuwe dataset data empty_data; attrib var1 length =8 format =best12. label =&#8220; var1 &#8220; var2 length =$30 format =$30. label =&#8220; var2 &#8220; var3 length =8 format =best12. label =&#8220; var3 &#8220; stop ; run ; Methode [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-3887","post","type-post","status-publish","format-standard","hentry","category-gids"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Hoe u een lege dataset maakt in SAS - Statorials<\/title>\n<meta name=\"description\" content=\"In deze zelfstudie wordt uitgelegd hoe u een lege gegevensset in SAS maakt, met verschillende voorbeelden.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/statorials.org\/nl\/zonder-een-lege-dataset-te-creeren\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hoe u een lege dataset maakt in SAS - Statorials\" \/>\n<meta property=\"og:description\" content=\"In deze zelfstudie wordt uitgelegd hoe u een lege gegevensset in SAS maakt, met verschillende voorbeelden.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/nl\/zonder-een-lege-dataset-te-creeren\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-14T23:29:39+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/vide1.jpg\" \/>\n<meta name=\"author\" content=\"Dr.benjamin anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Verfasst von\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dr.benjamin anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Gesch\u00e4tzte Lesezeit\" \/>\n\t<meta name=\"twitter:data2\" content=\"2\u00a0Minuten\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/nl\/zonder-een-lege-dataset-te-creeren\/\",\"url\":\"https:\/\/statorials.org\/nl\/zonder-een-lege-dataset-te-creeren\/\",\"name\":\"Hoe u een lege dataset maakt in SAS - Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/nl\/#website\"},\"datePublished\":\"2023-07-14T23:29:39+00:00\",\"dateModified\":\"2023-07-14T23:29:39+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\"},\"description\":\"In deze zelfstudie wordt uitgelegd hoe u een lege gegevensset in SAS maakt, met verschillende voorbeelden.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/nl\/zonder-een-lege-dataset-te-creeren\/#breadcrumb\"},\"inLanguage\":\"de\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/nl\/zonder-een-lege-dataset-te-creeren\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/nl\/zonder-een-lege-dataset-te-creeren\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Thuis\",\"item\":\"https:\/\/statorials.org\/nl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Hoe u een lege gegevensset maakt in sas\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/nl\/#website\",\"url\":\"https:\/\/statorials.org\/nl\/\",\"name\":\"Statorials\",\"description\":\"Uw gids voor statistische competentie\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/nl\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"de\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\",\"name\":\"Dr.benjamin anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"de\",\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/image\/\",\"url\":\"http:\/\/statorials.org\/nl\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"http:\/\/statorials.org\/nl\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Dr.benjamin anderson\"},\"description\":\"Ik ben Benjamin, een gepensioneerde hoogleraar statistiek die nu een toegewijde Statorials-lesgever is. 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