{"id":2903,"date":"2023-07-20T04:21:53","date_gmt":"2023-07-20T04:21:53","guid":{"rendered":"https:\/\/statorials.org\/tr\/r-toplama-islevi-varsayilan-olarak-uzun-sure-eksik\/"},"modified":"2023-07-20T04:21:53","modified_gmt":"2023-07-20T04:21:53","slug":"r-toplama-islevi-varsayilan-olarak-uzun-sure-eksik","status":"publish","type":"post","link":"https:\/\/statorials.org\/tr\/r-toplama-islevi-varsayilan-olarak-uzun-sure-eksik\/","title":{"rendered":"R'de nas\u0131l d\u00fczeltilir: toplama i\u015flevi eksik, varsay\u0131lan olarak "uzunluk" ayarlan\u0131yor"},"content":{"rendered":"

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R kullan\u0131rken kar\u015f\u0131la\u015fabilece\u011finiz bir hata:<\/span><\/p>\n

 Aggregation function missing: defaulting to length\n<\/strong><\/span><\/pre>\n
 Bu hata, bir veri \u00e7er\u00e7evesini uzun formattan geni\u015f formata<\/a> d\u00f6n\u00fc\u015ft\u00fcrmek i\u00e7in reshape2<\/strong> paketindeki dcast<\/strong> i\u015flevini kulland\u0131\u011f\u0131n\u0131zda ortaya \u00e7\u0131kar ancak geni\u015f veri \u00e7er\u00e7evesinin tek tek h\u00fccrelerine birden \u00e7ok de\u011fer yerle\u015ftirilebilir.<\/span><\/p>\n
 A\u015fa\u011f\u0131daki \u00f6rnekte bu hatan\u0131n pratikte nas\u0131l d\u00fczeltilece\u011fi g\u00f6sterilmektedir.<\/span><\/p>\n
 Hata nas\u0131l yeniden olu\u015fturulur?<\/strong><\/span><\/h3>\n
 R’de \u00e7e\u015fitli \u00fcr\u00fcnlerin sat\u0131\u015flar\u0131yla ilgili bilgileri i\u00e7eren a\u015fa\u011f\u0131daki veri \u00e7er\u00e7evesine sahip oldu\u011fumuzu varsayal\u0131m:<\/span><\/p>\n
 #create data frame\n<\/span>df <- data. frame<\/span> (store=c('A', 'A', 'A', 'A', 'B', 'B', 'B', 'B'),\n                 promotion=c('Y', 'Y', 'N', 'N', 'Y', 'Y', 'N', 'N'),\n                 product=c(1, 2, 1, 2, 1, 2, 1, 2),\n                 sales=c(12, 18, 29, 20, 30, 11, 15, 22))\n\n#view data frame\n<\/span>df\n\n  store promotion product sales\n1 AY 1 12\n2 AY 2 18\n3 YEAR 1 29\n4 YEAR 2 20\n5 BY 1 30\n6 BY 2 11\n7 BN 1 15\n8 BN 2 22<\/span><\/span><\/strong><\/pre>\n
 \u015eimdi veri \u00e7er\u00e7evesini uzun formattan geni\u015f formata d\u00f6n\u00fc\u015ft\u00fcrmek i\u00e7in dcast<\/strong> fonksiyonunu kullanmaya \u00e7al\u0131\u015ft\u0131\u011f\u0131m\u0131z\u0131 varsayal\u0131m:<\/span><\/span><\/p>\n
 library<\/span> (reshape2)\n\n#convert data frame to wide format\n<\/span>df_wide <- dcast(df, store ~ product, value. var<\/span> = \" sales<\/span> \")\n\n#view result\n<\/span>df_wide\n\nAggregation function missing: defaulting to length\n  store 1 2\n1 to 2 2\n2 B 2 2<\/span><\/span><\/strong><\/pre>\n
 Dcast i\u015flevinin \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 ancak Toplama \u0130\u015flevi Eksik<\/strong> uyar\u0131 mesaj\u0131n\u0131 ald\u0131\u011f\u0131m\u0131z\u0131 unutmay\u0131n.<\/span><\/span><\/p>\n
 Hata nas\u0131l d\u00fczeltilir?<\/strong><\/span><\/h3>\n
 Uyar\u0131 mesaj\u0131 almam\u0131z\u0131n nedeni, her ma\u011faza<\/strong> ve \u00fcr\u00fcn<\/strong> kombinasyonu i\u00e7in sat\u0131\u015fta<\/strong> kullanabilece\u011fimiz iki potansiyel de\u011ferin olmas\u0131d\u0131r.<\/span><\/p>\n
 \u00d6rne\u011fin A ma\u011fazas\u0131 ve 1. \u00fcr\u00fcn i\u00e7in sat\u0131\u015f de\u011feri 12 veya 29 olabilir.<\/span><\/p>\n
 Dolay\u0131s\u0131yla dcast<\/strong> i\u015flevi, toplama i\u015flevi olarak varsay\u0131lan olarak “uzunluk”a ayarlan\u0131r.<\/span><\/p>\n
 \u00d6rne\u011fin, b\u00fcy\u00fck veritaban\u0131 bize A ma\u011fazas\u0131 ve 1. \u00fcr\u00fcn i\u00e7in toplam 2<\/strong> sat\u0131\u015f de\u011feri oldu\u011funu s\u00f6yl\u00fcyor.<\/span><\/p>\n
 Bunun yerine farkl\u0131 bir toplama i\u015flevi kullanmak istiyorsan\u0131z fun.aggregate \u00f6\u011fesini<\/strong> kullanabilirsiniz.<\/span><\/p>\n
 \u00d6rne\u011fin, ma\u011faza<\/strong> ve \u00fcr\u00fcne<\/strong> g\u00f6re sat\u0131\u015flar\u0131n toplam\u0131n\u0131 hesaplamak i\u00e7in a\u015fa\u011f\u0131daki s\u00f6zdizimini kullanabiliriz:<\/span><\/p>\n
 library<\/span> (reshape2)\n\n#convert data frame to wide format\n<\/span>df_wide <- dcast(df, store ~ product, value. var<\/span> = \" sales<\/span> \", fun. aggregate<\/span> =sum)\n\n#view result<\/span>\ndf_wide\n\n  store 1 2\n1 A 41 38\n2 B 45 33\n<\/span><\/span><\/strong><\/pre>\n
 B\u00fcy\u00fck veri \u00e7er\u00e7evesindeki de\u011ferlerin nas\u0131l yorumlanaca\u011f\u0131 a\u015fa\u011f\u0131da a\u00e7\u0131klanm\u0131\u015ft\u0131r:<\/span><\/p>\n