{"id":2885,"date":"2023-07-20T06:30:21","date_gmt":"2023-07-20T06:30:21","guid":{"rendered":"https:\/\/statorials.org\/it\/sas-conta-i-valori-mancanti\/"},"modified":"2023-07-20T06:30:21","modified_gmt":"2023-07-20T06:30:21","slug":"sas-conta-i-valori-mancanti","status":"publish","type":"post","link":"https:\/\/statorials.org\/it\/sas-conta-i-valori-mancanti\/","title":{"rendered":"Come contare i valori mancanti in sas: con esempi"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><span style=\"color: #000000;\">\u00c8 possibile utilizzare i seguenti metodi per contare il numero di valori mancanti in SAS:<\/span><\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Metodo 1: conta i valori mancanti per le variabili numeriche<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #800080;\">proc means<\/span> <span style=\"color: #3366ff;\">data<\/span> =my_data\n    <span style=\"color: #3366ff;\">NMISS<\/span> ;\n<span style=\"color: #800080;\">run<\/span> ;<\/strong><\/span><\/pre>\n<p> <span style=\"color: #000000;\"><strong>Metodo 2: conta i valori mancanti per le variabili di carattere<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #800080;\">proc sql; \n<span style=\"color: #000000;\"><span style=\"color: #3366ff;\">select<\/span> nmiss(char1) <span style=\"color: #3366ff;\">as<\/span> char1_miss, nmiss(char2) <span style=\"color: #3366ff;\">as<\/span> char2_miss\n    <span style=\"color: #3366ff;\">from<\/span> my_data;<\/span>\nquit;<\/span><\/strong><\/span><\/pre>\n<p> <span style=\"color: #000000;\">I seguenti esempi mostrano come utilizzare ciascun metodo nella pratica con il seguente set di dati in SAS:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008000;\">\/*create dataset*\/\n<\/span><span style=\"color: #800080;\">data<\/span> my_data;\n    <span style=\"color: #3366ff;\">input<\/span> team $pos $rebounds assists;\n    <span style=\"color: #3366ff;\">datalines<\/span> ;\nGA 10 8\nBF4.\n. F 7 10\nDC. 14\nEF. 10\nFG 12 7\nGC. 11\n;\n<span style=\"color: #800080;\">run<\/span> ;\n\n<span style=\"color: #008000;\">\/*view dataset*\/\n<\/span><span style=\"color: #800080;\">proc print<\/span> <span style=\"color: #3366ff;\">data<\/span> =my_data;<\/strong><\/span> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-25207 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/compte-manque1.jpg\" alt=\"\" width=\"263\" height=\"198\" srcset=\"\" sizes=\"\"><\/p>\n<h3> <span style=\"color: #000000;\"><b>Esempio 1: conteggio dei valori mancanti per le variabili numeriche<\/b><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Possiamo utilizzare il seguente codice per contare il numero di valori mancanti per ciascuna delle variabili numeriche nel set di dati:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">\/*count missing values for each numeric variable*\/\n<span style=\"color: #000000;\"><span style=\"color: #800080;\">proc means<\/span> <span style=\"color: #3366ff;\">data<\/span> =my_data\n    <span style=\"color: #3366ff;\">NMISS<\/span> ;\n<span style=\"color: #800080;\">run<\/span> ;\n<\/span><\/span><\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-25208 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/compte-manque2.jpg\" alt=\"\" width=\"178\" height=\"123\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">Dal risultato possiamo vedere:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">Ci sono 3 valori mancanti in totale nella colonna <strong>dei rimbalzi<\/strong> .<\/span><\/li>\n<li> <span style=\"color: #000000;\">C&#8217;\u00e8 1 valore mancante in totale nella colonna <strong>degli assist<\/strong> .<\/span><\/li>\n<\/ul>\n<h3> <span style=\"color: #000000;\"><b>Esempio 2: contare i valori mancanti per le variabili di carattere<\/b><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Possiamo utilizzare il seguente codice per contare il numero di valori mancanti per ciascuna delle variabili di carattere nel set di dati:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">\/*count missing for each character variable*\/\n<span style=\"color: #000000;\"><span style=\"color: #800080;\">proc sql<\/span> ; \n    <span style=\"color: #3366ff;\">select<\/span> nmiss(team) <span style=\"color: #3366ff;\">as<\/span> team_miss, nmiss(pos) <span style=\"color: #3366ff;\">as<\/span> pos_miss\n    <span style=\"color: #3366ff;\">from<\/span> my_data; \n<span style=\"color: #800080;\">quit<\/span> ;\n<\/span><\/span><\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-25209 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/compte-manque3.jpg\" alt=\"\" width=\"202\" height=\"86\" srcset=\"\" sizes=\"\"><\/p>\n<p> <span style=\"color: #000000;\">Dal risultato possiamo vedere:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\">C&#8217;\u00e8 1 valore mancante nella colonna <b>Team<\/b> .<\/span><\/li>\n<li> <span style=\"color: #000000;\">Ci sono 0 valori mancanti nella colonna <b>pos<\/b> .<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\"><strong>Nota<\/strong> : \u00e8 possibile trovare la documentazione completa per la funzionalit\u00e0 <strong>NMISS<\/strong> <a href=\"https:\/\/documentation.sas.com\/doc\/en\/pgmsascdc\/9.4_3.2\/lefunctionsref\/p0nw8trwk5ooesn1o8zrtd5c6j1t.htm\" target=\"_blank\" rel=\"noopener\">qui<\/a> .<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Risorse addizionali<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">I seguenti tutorial spiegano come eseguire altre attivit\u00e0 comuni in SAS:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/it\/normalizzare-i-dati-nella-camera-di-equilibrio\/\" target=\"_blank\" rel=\"noopener\">Come normalizzare i dati in SAS<\/a><br \/> <a href=\"https:\/\/statorials.org\/it\/non-rimuovere-i-duplicati\/\" target=\"_blank\" rel=\"noopener\">Come rimuovere i duplicati in SAS<\/a><br \/> <a href=\"https:\/\/statorials.org\/it\/senza-sostituire-i-valori-mancanti-con-zero\/\" target=\"_blank\" rel=\"noopener\">Come sostituire i valori mancanti con zero in SAS<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00c8 possibile utilizzare i seguenti metodi per contare il numero di valori mancanti in SAS: Metodo 1: conta i valori mancanti per le variabili numeriche proc means data =my_data NMISS ; run ; Metodo 2: conta i valori mancanti per le variabili di carattere proc sql; select nmiss(char1) as char1_miss, nmiss(char2) as char2_miss from my_data; [&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":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Come contare i valori mancanti in SAS (con esempi) - Statorials<\/title>\n<meta name=\"description\" content=\"Questo tutorial spiega come contare i valori mancanti in SAS, con diversi esempi.\" \/>\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\/it\/sas-conta-i-valori-mancanti\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Come contare i valori mancanti in SAS (con esempi) - Statorials\" \/>\n<meta property=\"og:description\" content=\"Questo tutorial spiega come contare i valori mancanti in SAS, con diversi esempi.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/it\/sas-conta-i-valori-mancanti\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-20T06:30:21+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/compte-manque1.jpg\" \/>\n<meta name=\"author\" content=\"Benjamin anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Benjamin anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minuto\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/it\/sas-conta-i-valori-mancanti\/\",\"url\":\"https:\/\/statorials.org\/it\/sas-conta-i-valori-mancanti\/\",\"name\":\"Come contare i valori mancanti in SAS (con esempi) - Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/it\/#website\"},\"datePublished\":\"2023-07-20T06:30:21+00:00\",\"dateModified\":\"2023-07-20T06:30:21+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/0896f191fb9fb019f2cd8623112cb3ae\"},\"description\":\"Questo tutorial spiega come contare i valori mancanti in SAS, con diversi esempi.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/it\/sas-conta-i-valori-mancanti\/#breadcrumb\"},\"inLanguage\":\"it-IT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/it\/sas-conta-i-valori-mancanti\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/it\/sas-conta-i-valori-mancanti\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Casa\",\"item\":\"https:\/\/statorials.org\/it\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Come contare i valori mancanti in sas: con esempi\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/it\/#website\",\"url\":\"https:\/\/statorials.org\/it\/\",\"name\":\"Statorials\",\"description\":\"La tua guida all&#039;alfabetizzazione statistica!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/it\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"it-IT\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/0896f191fb9fb019f2cd8623112cb3ae\",\"name\":\"Benjamin anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"it-IT\",\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/it\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/it\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Benjamin anderson\"},\"description\":\"Ciao, sono Benjamin, un professore di statistica in pensione diventato insegnante dedicato di Statorials. 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