{"id":1218,"date":"2023-07-27T06:02:37","date_gmt":"2023-07-27T06:02:37","guid":{"rendered":"https:\/\/statorials.org\/ar\/%d8%a7%d9%94%d8%b4%d8%ac%d8%a7%d8%b1-%d8%a7%d9%84%d8%aa%d8%b5%d9%86%d9%8a%d9%81-%d9%88%d8%a7%d9%84%d8%a7%d9%86%d8%ad%d8%af%d8%a7%d8%b1-%d9%81%d9%8a-%d8%b5\/"},"modified":"2023-07-27T06:02:37","modified_gmt":"2023-07-27T06:02:37","slug":"%d8%a7%d9%94%d8%b4%d8%ac%d8%a7%d8%b1-%d8%a7%d9%84%d8%aa%d8%b5%d9%86%d9%8a%d9%81-%d9%88%d8%a7%d9%84%d8%a7%d9%86%d8%ad%d8%af%d8%a7%d8%b1-%d9%81%d9%8a-%d8%b5","status":"publish","type":"post","link":"https:\/\/statorials.org\/ar\/%d8%a7%d9%94%d8%b4%d8%ac%d8%a7%d8%b1-%d8%a7%d9%84%d8%aa%d8%b5%d9%86%d9%8a%d9%81-%d9%88%d8%a7%d9%84%d8%a7%d9%86%d8%ad%d8%af%d8%a7%d8%b1-%d9%81%d9%8a-%d8%b5\/","title":{"rendered":"\u0643\u064a\u0641\u064a\u0629 \u0645\u0644\u0627\u0621\u0645\u0629 \u0623\u0634\u062c\u0627\u0631 \u0627\u0644\u062a\u0635\u0646\u064a\u0641 \u0648\u0627\u0644\u0627\u0646\u062d\u062f\u0627\u0631 \u0641\u064a r"},"content":{"rendered":"

<\/p>\n

\n

\u0639\u0646\u062f\u0645\u0627 \u062a\u0643\u0648\u0646 \u0627\u0644\u0639\u0644\u0627\u0642\u0629 \u0628\u064a\u0646 \u0645\u062c\u0645\u0648\u0639\u0629 \u0645\u0646 \u0627\u0644\u0645\u062a\u063a\u064a\u0631\u0627\u062a \u0627\u0644\u0645\u062a\u0648\u0642\u0639\u0629 \u0648\u0645\u062a\u063a\u064a\u0631 \u0627\u0644\u0627\u0633\u062a\u062c\u0627\u0628\u0629<\/a> \u062e\u0637\u064a\u0629\u060c \u0641\u0625\u0646 \u0637\u0631\u0642 \u0645\u062b\u0644 \u0627\u0644\u0627\u0646\u062d\u062f\u0627\u0631 \u0627\u0644\u062e\u0637\u064a \u0627\u0644\u0645\u062a\u0639\u062f\u062f<\/a> \u064a\u0645\u0643\u0646 \u0623\u0646 \u062a\u0646\u062a\u062c \u0646\u0645\u0627\u0630\u062c \u062a\u0646\u0628\u0624\u064a\u0629 \u062f\u0642\u064a\u0642\u0629.<\/span><\/p>\n

\u0648\u0645\u0639 \u0630\u0644\u0643\u060c \u0639\u0646\u062f\u0645\u0627 \u062a\u0643\u0648\u0646 \u0627\u0644\u0639\u0644\u0627\u0642\u0629 \u0628\u064a\u0646 \u0645\u062c\u0645\u0648\u0639\u0629 \u0645\u0646 \u0627\u0644\u062a\u0646\u0628\u0624\u0627\u062a \u0648\u0627\u0644\u0627\u0633\u062a\u062c\u0627\u0628\u0629 \u0623\u0643\u062b\u0631 \u062a\u0639\u0642\u064a\u062f\u064b\u0627\u060c \u064a\u0645\u0643\u0646 \u0644\u0644\u0637\u0631\u0642 \u063a\u064a\u0631 \u0627\u0644\u062e\u0637\u064a\u0629 \u0641\u064a \u0643\u062b\u064a\u0631 \u0645\u0646 \u0627\u0644\u0623\u062d\u064a\u0627\u0646 \u0625\u0646\u062a\u0627\u062c \u0646\u0645\u0627\u0630\u062c \u0623\u0643\u062b\u0631 \u062f\u0642\u0629.<\/span><\/p>\n

\u0625\u062d\u062f\u0649 \u0647\u0630\u0647 \u0627\u0644\u0637\u0631\u0642 \u0647\u064a \u0623\u0634\u062c\u0627\u0631 \u0627\u0644\u062a\u0635\u0646\u064a\u0641 \u0648\u0627\u0644\u0627\u0646\u062d\u062f\u0627\u0631<\/a> (CART)\u060c \u0648\u0627\u0644\u062a\u064a \u062a\u0633\u062a\u062e\u062f\u0645 \u0645\u062c\u0645\u0648\u0639\u0629 \u0645\u0646 \u0627\u0644\u0645\u062a\u063a\u064a\u0631\u0627\u062a \u0627\u0644\u0645\u062a\u0648\u0642\u0639\u0629 \u0644\u0625\u0646\u0634\u0627\u0621 \u0623\u0634\u062c\u0627\u0631 \u0627\u0644\u0642\u0631\u0627\u0631 \u0627\u0644\u062a\u064a \u062a\u062a\u0646\u0628\u0623 \u0628\u0642\u064a\u0645\u0629 \u0645\u062a\u063a\u064a\u0631 \u0627\u0644\u0627\u0633\u062a\u062c\u0627\u0628\u0629.<\/span><\/p>\n

\u0625\u0630\u0627 \u0643\u0627\u0646 \u0645\u062a\u063a\u064a\u0631 \u0627\u0644\u0627\u0633\u062a\u062c\u0627\u0628\u0629 \u0645\u0633\u062a\u0645\u0631\u064b\u0627 \u064a\u0645\u0643\u0646\u0646\u0627 \u0628\u0646\u0627\u0621 \u0623\u0634\u062c\u0627\u0631 \u0627\u0644\u0627\u0646\u062d\u062f\u0627\u0631 \u0648\u0625\u0630\u0627 \u0643\u0627\u0646 \u0645\u062a\u063a\u064a\u0631 \u0627\u0644\u0627\u0633\u062a\u062c\u0627\u0628\u0629 \u0642\u0627\u0637\u0639\u064b\u0627 \u064a\u0645\u0643\u0646\u0646\u0627 \u0628\u0646\u0627\u0621 \u0623\u0634\u062c\u0627\u0631 \u0627\u0644\u062a\u0635\u0646\u064a\u0641.<\/span><\/p>\n

\u064a\u0634\u0631\u062d \u0647\u0630\u0627 \u0627\u0644\u0628\u0631\u0646\u0627\u0645\u062c \u0627\u0644\u062a\u0639\u0644\u064a\u0645\u064a \u0643\u064a\u0641\u064a\u0629 \u0625\u0646\u0634\u0627\u0621 \u0623\u0634\u062c\u0627\u0631 \u0627\u0644\u0627\u0646\u062d\u062f\u0627\u0631 \u0648\u0627\u0644\u062a\u0635\u0646\u064a\u0641 \u0641\u064a R.<\/span><\/p>\n

\u0627\u0644\u0645\u062b\u0627\u0644 1: \u0628\u0646\u0627\u0621 \u0634\u062c\u0631\u0629 \u0627\u0644\u0627\u0646\u062d\u062f\u0627\u0631 \u0641\u064a R<\/strong><\/span><\/h3>\n

\u0641\u064a \u0647\u0630\u0627 \u0627\u0644\u0645\u062b\u0627\u0644\u060c \u0633\u0648\u0641 \u0646\u0633\u062a\u062e\u062f\u0645 \u0645\u062c\u0645\u0648\u0639\u0629 \u0628\u064a\u0627\u0646\u0627\u062a Hitters<\/strong> \u0645\u0646 \u062d\u0632\u0645\u0629 ISLR<\/strong> \u060c \u0648\u0627\u0644\u062a\u064a \u062a\u062d\u062a\u0648\u064a \u0639\u0644\u0649 \u0645\u0639\u0644\u0648\u0645\u0627\u062a \u0645\u062a\u0646\u0648\u0639\u0629 \u0639\u0646 263 \u0644\u0627\u0639\u0628 \u0628\u064a\u0633\u0628\u0648\u0644 \u0645\u062d\u062a\u0631\u0641.<\/span><\/p>\n

\u0633\u0648\u0641 \u0646\u0633\u062a\u062e\u062f\u0645 \u0645\u062c\u0645\u0648\u0639\u0629 \u0627\u0644\u0628\u064a\u0627\u0646\u0627\u062a \u0647\u0630\u0647 \u0644\u0625\u0646\u0634\u0627\u0621 \u0634\u062c\u0631\u0629 \u0627\u0646\u062d\u062f\u0627\u0631 \u062a\u0633\u062a\u062e\u062f\u0645 \u0627\u0644\u0645\u062a\u063a\u064a\u0631\u0627\u062a \u0627\u0644\u0645\u062a\u0648\u0642\u0639\u0629 \u0644\u0639\u062f\u062f \u0645\u0631\u0627\u062a \u0627\u0644\u0644\u0639\u0628 \u0639\u0644\u0649 \u0623\u0631\u0636\u0647<\/em> \u0648\u0633\u0646\u0648\u0627\u062a \u0627\u0644\u0644\u0639\u0628<\/em> \u0644\u0644\u062a\u0646\u0628\u0624 \u0628\u0631\u0627\u062a\u0628<\/em> \u0644\u0627\u0639\u0628 \u0645\u0639\u064a\u0646.<\/span><\/p>\n

\u0627\u0633\u062a\u062e\u062f\u0645 \u0627\u0644\u062e\u0637\u0648\u0627\u062a \u0627\u0644\u062a\u0627\u0644\u064a\u0629 \u0644\u0625\u0646\u0634\u0627\u0621 \u0634\u062c\u0631\u0629 \u0627\u0644\u0627\u0646\u062d\u062f\u0627\u0631 \u0647\u0630\u0647.<\/span><\/p>\n

\u0627\u0644\u062e\u0637\u0648\u0629 1: \u062a\u062d\u0645\u064a\u0644 \u0627\u0644\u062d\u0632\u0645 \u0627\u0644\u0644\u0627\u0632\u0645\u0629.<\/strong><\/span><\/p>\n

\u0623\u0648\u0644\u0627\u064b\u060c \u0633\u0646\u0642\u0648\u0645 \u0628\u062a\u062d\u0645\u064a\u0644 \u0627\u0644\u062d\u0632\u0645 \u0627\u0644\u0644\u0627\u0632\u0645\u0629 \u0644\u0647\u0630\u0627 \u0627\u0644\u0645\u062b\u0627\u0644:<\/span><\/p>\n

 library<\/span> (ISLR) #contains Hitters dataset<\/span>\nlibrary<\/span> (rpart) #for fitting decision trees<\/span>\nlibrary<\/span> (rpart.plot) #for plotting decision trees\n<\/span><\/strong><\/pre>\n
 \u0627\u0644\u062e\u0637\u0648\u0629 2: \u0628\u0646\u0627\u0621 \u0634\u062c\u0631\u0629 \u0627\u0644\u0627\u0646\u062d\u062f\u0627\u0631 \u0627\u0644\u0623\u0648\u0644\u064a\u0629.<\/strong><\/span><\/p>\n
 \u0623\u0648\u0644\u0627\u064b\u060c \u0633\u0646\u0642\u0648\u0645 \u0628\u0628\u0646\u0627\u0621 \u0634\u062c\u0631\u0629 \u0627\u0646\u062d\u062f\u0627\u0631 \u0623\u0648\u0644\u064a\u0629 \u0643\u0628\u064a\u0631\u0629. \u064a\u0645\u0643\u0646\u0646\u0627 \u0623\u0646 \u0646\u0636\u0645\u0646 \u0623\u0646 \u0627\u0644\u0634\u062c\u0631\u0629 \u0643\u0628\u064a\u0631\u0629 \u0628\u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0642\u064a\u0645\u0629 \u0635\u063a\u064a\u0631\u0629 \u0644\u0640 cp<\/strong> \u060c \u0648\u0627\u0644\u062a\u064a \u062a\u0634\u064a\u0631 \u0625\u0644\u0649 “\u0645\u0639\u0644\u0645\u0629 \u0627\u0644\u062a\u0639\u0642\u064a\u062f”.<\/span><\/p>\n
 \u0647\u0630\u0627 \u064a\u0639\u0646\u064a \u0623\u0646\u0646\u0627 \u0633\u0646\u0642\u0648\u0645 \u0628\u0625\u062c\u0631\u0627\u0621 \u0627\u0644\u0645\u0632\u064a\u062f \u0645\u0646 \u0627\u0644\u0627\u0646\u0642\u0633\u0627\u0645\u0627\u062a \u0639\u0644\u0649 \u0634\u062c\u0631\u0629 \u0627\u0644\u0627\u0646\u062d\u062f\u0627\u0631 \u0637\u0627\u0644\u0645\u0627 \u0623\u0646 \u0645\u0631\u0628\u0639 R \u0627\u0644\u0625\u062c\u0645\u0627\u0644\u064a \u0644\u0644\u0646\u0645\u0648\u0630\u062c \u064a\u0632\u064a\u062f \u0639\u0644\u0649 \u0627\u0644\u0623\u0642\u0644 \u0628\u0627\u0644\u0642\u064a\u0645\u0629 \u0627\u0644\u0645\u062d\u062f\u062f\u0629 \u0628\u0648\u0627\u0633\u0637\u0629 cp.<\/span><\/p>\n
 \u0633\u0646\u0633\u062a\u062e\u062f\u0645 \u0628\u0639\u062f \u0630\u0644\u0643 \u0627\u0644\u062f\u0627\u0644\u0629 printcp()<\/strong> \u200e \u0644\u0637\u0628\u0627\u0639\u0629 \u0646\u062a\u0627\u0626\u062c \u0627\u0644\u0646\u0645\u0648\u0630\u062c:<\/span><\/p>\n
 #build the initial tree\n<\/span>tree <- rpart(Salary ~ Years + HmRun, data=Hitters, control=rpart. control<\/span> (cp= .0001<\/span> ))\n\n#view results<\/span>\nprintcp(tree)\n\nVariables actually used in tree construction:\n[1] HmRun Years\n\nRoot node error: 53319113\/263 = 202734\n\nn=263 (59 observations deleted due to missingness)\n\n           CP nsplit rel error xerror xstd\n1 0.24674996 0 1.00000 1.00756 0.13890\n2 0.10806932 1 0.75325 0.76438 0.12828\n3 0.01865610 2 0.64518 0.70295 0.12769\n4 0.01761100 3 0.62652 0.70339 0.12337\n5 0.01747617 4 0.60891 0.70339 0.12337\n6 0.01038188 5 0.59144 0.66629 0.11817\n7 0.01038065 6 0.58106 0.65697 0.11687\n8 0.00731045 8 0.56029 0.67177 0.11913\n9 0.00714883 9 0.55298 0.67881 0.11960\n10 0.00708618 10 0.54583 0.68034 0.11988\n11 0.00516285 12 0.53166 0.68427 0.11997\n12 0.00445345 13 0.52650 0.68994 0.11996\n13 0.00406069 14 0.52205 0.68988 0.11940\n14 0.00264728 15 0.51799 0.68874 0.11916\n15 0.00196586 16 0.51534 0.68638 0.12043\n16 0.00016686 17 0.51337 0.67577 0.11635\n17 0.00010000 18 0.51321 0.67576 0.11615\nn=263 (59 observations deleted due to missingness)\n<\/span><\/span><\/strong><\/pre>\n
 \u0627\u0644\u062e\u0637\u0648\u0629 3: \u062a\u0642\u0644\u064a\u0645 \u0627\u0644\u0634\u062c\u0631\u0629<\/strong><\/span><\/p>\n
 \u0628\u0639\u062f \u0630\u0644\u0643\u060c \u0633\u0646\u0642\u0648\u0645 \u0628\u062a\u0642\u0644\u064a\u0645 \u0634\u062c\u0631\u0629 \u0627\u0644\u0627\u0646\u062d\u062f\u0627\u0631 \u0644\u0644\u0639\u062b\u0648\u0631 \u0639\u0644\u0649 \u0627\u0644\u0642\u064a\u0645\u0629 \u0627\u0644\u0645\u062b\u0644\u0649 \u0644\u0627\u0633\u062a\u062e\u062f\u0627\u0645\u0647\u0627 \u0641\u064a cp (\u0645\u0639\u0644\u0645\u0629 \u0627\u0644\u062a\u0639\u0642\u064a\u062f) \u0627\u0644\u062a\u064a \u062a\u0624\u062f\u064a \u0625\u0644\u0649 \u0623\u0642\u0644 \u062e\u0637\u0623 \u0641\u064a \u0627\u0644\u0627\u062e\u062a\u0628\u0627\u0631.<\/span><\/p>\n
 \u0644\u0627\u062d\u0638 \u0623\u0646 \u0627\u0644\u0642\u064a\u0645\u0629 \u0627\u0644\u0645\u062b\u0644\u0649 \u0644\u0640 cp \u0647\u064a \u0627\u0644\u0642\u064a\u0645\u0629 \u0627\u0644\u062a\u064a \u062a\u0624\u062f\u064a \u0625\u0644\u0649 \u0623\u062f\u0646\u0649 \u062e\u0637\u0623 x<\/strong> \u0641\u064a \u0627\u0644\u0625\u062e\u0631\u0627\u062c \u0627\u0644\u0633\u0627\u0628\u0642\u060c \u0648\u0627\u0644\u0630\u064a \u064a\u0645\u062b\u0644 \u0627\u0644\u062e\u0637\u0623 \u0641\u064a \u0627\u0644\u0645\u0644\u0627\u062d\u0638\u0627\u062a \u0645\u0646 \u0628\u064a\u0627\u0646\u0627\u062a \u0627\u0644\u062a\u062d\u0642\u0642 \u0645\u0646 \u0627\u0644\u0635\u062d\u0629.<\/span> <\/p>\n
 #identify best cp value to use\nbest <- tree$cptable[which. min<\/span> (tree$cptable[,\" xerror<\/span> \"]),\" CP<\/span> \"]\n\n#produce a pruned tree based on the best cp value\n<\/span>pruned_tree <- prune<\/span> (tree, cp=best)\n\n#plot the pruned tree\n<\/span>prp(pruned_tree,\n    faclen= 0<\/span> , #use full names for factor labels<\/span>\n    extra= 1<\/span> , #display number of obs. for each terminal node<\/span>\n    roundint= F<\/span> , #don't round to integers in output<\/span>\n    digits= 5<\/span> ) #display 5 decimal places in output\n<\/span><\/span><\/span><\/span><\/strong><\/pre>\n
\"\u0634\u062c\u0631\u0629<\/p>\n
 \u064a\u0645\u0643\u0646\u0646\u0627 \u0623\u0646 \u0646\u0631\u0649 \u0623\u0646 \u0627\u0644\u0634\u062c\u0631\u0629 \u0627\u0644\u0645\u0634\u0630\u0628\u0629 \u0627\u0644\u0646\u0647\u0627\u0626\u064a\u0629 \u0628\u0647\u0627 \u0633\u062a \u0639\u0642\u062f \u0637\u0631\u0641\u064a\u0629. \u062a\u0639\u0631\u0636 \u0643\u0644 \u0639\u0642\u062f\u0629 \u0637\u0631\u0641\u064a\u0629 \u0627\u0644\u0631\u0627\u062a\u0628 \u0627\u0644\u0645\u062a\u0648\u0642\u0639 \u0644\u0644\u0627\u0639\u0628\u064a\u0646 \u0641\u064a \u062a\u0644\u0643 \u0627\u0644\u0639\u0642\u062f\u0629 \u0628\u0627\u0644\u0625\u0636\u0627\u0641\u0629 \u0625\u0644\u0649 \u0639\u062f\u062f \u0627\u0644\u0645\u0644\u0627\u062d\u0638\u0627\u062a \u0645\u0646 \u0645\u062c\u0645\u0648\u0639\u0629 \u0627\u0644\u0628\u064a\u0627\u0646\u0627\u062a \u0627\u0644\u0623\u0635\u0644\u064a\u0629 \u0627\u0644\u062a\u064a \u062a\u0646\u062a\u0645\u064a \u0625\u0644\u0649 \u062a\u0644\u0643 \u0627\u0644\u062f\u0631\u062c\u0629.<\/span><\/p>\n
 \u0639\u0644\u0649 \u0633\u0628\u064a\u0644 \u0627\u0644\u0645\u062b\u0627\u0644\u060c \u064a\u0645\u0643\u0646\u0646\u0627 \u0623\u0646 \u0646\u0631\u0649 \u0623\u0646\u0647 \u0641\u064a \u0645\u062c\u0645\u0648\u0639\u0629 \u0627\u0644\u0628\u064a\u0627\u0646\u0627\u062a \u0627\u0644\u0623\u0635\u0644\u064a\u0629\u060c \u0643\u0627\u0646 \u0647\u0646\u0627\u0643 90 \u0644\u0627\u0639\u0628\u064b\u0627 \u0644\u062f\u064a\u0647\u0645 \u0623\u0642\u0644 \u0645\u0646 4.5 \u0633\u0646\u0648\u0627\u062a \u0645\u0646 \u0627\u0644\u062e\u0628\u0631\u0629 \u0648\u0643\u0627\u0646 \u0645\u062a\u0648\u0633\u0637 \u0631\u0648\u0627\u062a\u0628\u0647\u0645 225.83 \u0623\u0644\u0641 \u062f\u0648\u0644\u0627\u0631.<\/span> <\/p>\n
\"\u062a\u0641\u0633\u064a\u0631<\/p>\n
 \u0627\u0644\u062e\u0637\u0648\u0629 4: \u0627\u0633\u062a\u062e\u062f\u0645 \u0627\u0644\u0634\u062c\u0631\u0629 \u0644\u0639\u0645\u0644 \u062a\u0646\u0628\u0624\u0627\u062a.<\/strong><\/span><\/p>\n
 \u064a\u0645\u0643\u0646\u0646\u0627 \u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0627\u0644\u0634\u062c\u0631\u0629 \u0627\u0644\u0645\u0634\u0630\u0628\u0629 \u0627\u0644\u0646\u0647\u0627\u0626\u064a\u0629 \u0644\u0644\u062a\u0646\u0628\u0624 \u0628\u0631\u0627\u062a\u0628 \u0644\u0627\u0639\u0628 \u0645\u0639\u064a\u0646 \u0628\u0646\u0627\u0621\u064b \u0639\u0644\u0649 \u0633\u0646\u0648\u0627\u062a \u062e\u0628\u0631\u062a\u0647 \u0648\u0645\u062a\u0648\u0633\u0637 \u062c\u0648\u0644\u0627\u062a\u0647 \u0639\u0644\u0649 \u0623\u0631\u0636\u0647.<\/span><\/p>\n
 \u0639\u0644\u0649 \u0633\u0628\u064a\u0644 \u0627\u0644\u0645\u062b\u0627\u0644\u060c \u0627\u0644\u0644\u0627\u0639\u0628 \u0627\u0644\u0630\u064a \u0644\u062f\u064a\u0647 7 \u0633\u0646\u0648\u0627\u062a \u0645\u0646 \u0627\u0644\u062e\u0628\u0631\u0629 \u06484 \u062c\u0648\u0644\u0627\u062a \u0645\u0646\u0632\u0644\u064a\u0629 \u0641\u064a \u0627\u0644\u0645\u062a\u0648\u0633\u0637 \u0644\u062f\u064a\u0647 \u0631\u0627\u062a\u0628 \u0645\u062a\u0648\u0642\u0639 \u0642\u062f\u0631\u0647 502.81 \u0623\u0644\u0641 \u062f\u0648\u0644\u0627\u0631<\/strong> .<\/span> <\/p>\n
\"\u0645\u062b\u0627\u0644<\/p>\n
 \u064a\u0645\u0643\u0646\u0646\u0627 \u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0627\u0644\u062f\u0627\u0644\u0629 \u0627\u0644\u062a\u0646\u0628\u0624 ()<\/strong> \u0641\u064a R \u0644\u062a\u0623\u0643\u064a\u062f \u0630\u0644\u0643:<\/span><\/p>\n
 #define new player\nnew <- data.frame(Years=7, HmRun=4)\n\n<\/span>#use pruned tree to predict salary of this player\npredict(pruned_tree, newdata=new)\n\n502.8079<\/span><\/span><\/span><\/strong><\/pre>\n
 \u0645\u062b\u0627\u0644 2: \u0628\u0646\u0627\u0621 \u0634\u062c\u0631\u0629 \u062a\u0635\u0646\u064a\u0641 \u0641\u064a R<\/strong><\/span><\/h3>\n
 \u0641\u064a \u0647\u0630\u0627 \u0627\u0644\u0645\u062b\u0627\u0644\u060c \u0633\u0648\u0641 \u0646\u0633\u062a\u062e\u062f\u0645 \u0645\u062c\u0645\u0648\u0639\u0629 \u0628\u064a\u0627\u0646\u0627\u062a ptitanic<\/strong> \u0645\u0646 \u0627\u0644\u062d\u0632\u0645\u0629 rpart.plot<\/strong> \u060c \u0648\u0627\u0644\u062a\u064a \u062a\u062d\u062a\u0648\u064a \u0639\u0644\u0649 \u0645\u0639\u0644\u0648\u0645\u0627\u062a \u0645\u062a\u0646\u0648\u0639\u0629 \u062d\u0648\u0644 \u0627\u0644\u0631\u0643\u0627\u0628 \u0639\u0644\u0649 \u0645\u062a\u0646 Titanic.<\/span><\/p>\n
 \u0633\u0646\u0633\u062a\u062e\u062f\u0645 \u0645\u062c\u0645\u0648\u0639\u0629 \u0627\u0644\u0628\u064a\u0627\u0646\u0627\u062a \u0647\u0630\u0647 \u0644\u0625\u0646\u0634\u0627\u0621 \u0634\u062c\u0631\u0629 \u062a\u0635\u0646\u064a\u0641 \u062a\u0633\u062a\u062e\u062f\u0645 \u0645\u062a\u063a\u064a\u0631\u0627\u062a \u0627\u0644\u062a\u0648\u0642\u0639 \u0645\u062b\u0644 \u0627\u0644\u0641\u0626\u0629<\/em> \u0648\u0627\u0644\u062c\u0646\u0633<\/em> \u0648\u0627\u0644\u0639\u0645\u0631<\/em> \u0644\u0644\u062a\u0646\u0628\u0624 \u0628\u0645\u0627 \u0625\u0630\u0627 \u0643\u0627\u0646 \u0631\u0627\u0643\u0628 \u0645\u0639\u064a\u0646 \u0642\u062f \u0646\u062c\u0627 \u0623\u0645 \u0644\u0627.<\/span><\/p>\n
 \u0627\u0633\u062a\u062e\u062f\u0645 \u0627\u0644\u062e\u0637\u0648\u0627\u062a \u0627\u0644\u062a\u0627\u0644\u064a\u0629 \u0644\u0625\u0646\u0634\u0627\u0621 \u0634\u062c\u0631\u0629 \u0627\u0644\u062a\u0635\u0646\u064a\u0641 \u0647\u0630\u0647.<\/span><\/p>\n
 \u0627\u0644\u062e\u0637\u0648\u0629 1: \u062a\u062d\u0645\u064a\u0644 \u0627\u0644\u062d\u0632\u0645 \u0627\u0644\u0644\u0627\u0632\u0645\u0629.<\/strong><\/span><\/p>\n
 \u0623\u0648\u0644\u0627\u064b\u060c \u0633\u0646\u0642\u0648\u0645 \u0628\u062a\u062d\u0645\u064a\u0644 \u0627\u0644\u062d\u0632\u0645 \u0627\u0644\u0644\u0627\u0632\u0645\u0629 \u0644\u0647\u0630\u0627 \u0627\u0644\u0645\u062b\u0627\u0644:<\/span><\/p>\n
 library<\/span> (rpart) #for fitting decision trees<\/span>\nlibrary<\/span> (rpart.plot) #for plotting decision trees\n<\/span><\/strong><\/pre>\n
 \u0627\u0644\u062e\u0637\u0648\u0629 2: \u0628\u0646\u0627\u0621 \u0634\u062c\u0631\u0629 \u0627\u0644\u062a\u0635\u0646\u064a\u0641 \u0627\u0644\u0623\u0648\u0644\u064a\u0629.<\/strong><\/span><\/p>\n
 \u0623\u0648\u0644\u0627\u064b\u060c \u0633\u0646\u0642\u0648\u0645 \u0628\u0628\u0646\u0627\u0621 \u0634\u062c\u0631\u0629 \u062a\u0635\u0646\u064a\u0641 \u0623\u0648\u0644\u064a\u0629 \u0643\u0628\u064a\u0631\u0629. \u064a\u0645\u0643\u0646\u0646\u0627 \u0623\u0646 \u0646\u0636\u0645\u0646 \u0623\u0646 \u0627\u0644\u0634\u062c\u0631\u0629 \u0643\u0628\u064a\u0631\u0629 \u0628\u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0642\u064a\u0645\u0629 \u0635\u063a\u064a\u0631\u0629 \u0644\u0640 cp<\/strong> \u060c \u0648\u0627\u0644\u062a\u064a \u062a\u0634\u064a\u0631 \u0625\u0644\u0649 “\u0645\u0639\u0644\u0645\u0629 \u0627\u0644\u062a\u0639\u0642\u064a\u062f”.<\/span><\/p>\n
 \u0648\u0647\u0630\u0627 \u064a\u0639\u0646\u064a \u0623\u0646\u0646\u0627 \u0633\u0646\u0642\u0648\u0645 \u0628\u0625\u062c\u0631\u0627\u0621 \u0627\u0644\u0645\u0632\u064a\u062f \u0645\u0646 \u0627\u0644\u0627\u0646\u0642\u0633\u0627\u0645\u0627\u062a \u0639\u0644\u0649 \u0634\u062c\u0631\u0629 \u0627\u0644\u062a\u0635\u0646\u064a\u0641 \u0637\u0627\u0644\u0645\u0627 \u0623\u0646 \u0627\u0644\u0645\u0644\u0627\u0621\u0645\u0629 \u0627\u0644\u0625\u062c\u0645\u0627\u0644\u064a\u0629 \u0644\u0644\u0646\u0645\u0648\u0630\u062c \u062a\u0632\u062f\u0627\u062f \u0628\u0645\u0642\u062f\u0627\u0631 \u0627\u0644\u0642\u064a\u0645\u0629 \u0627\u0644\u0645\u062d\u062f\u062f\u0629 \u0628\u0648\u0627\u0633\u0637\u0629 cp \u0639\u0644\u0649 \u0627\u0644\u0623\u0642\u0644.<\/span><\/p>\n
 \u0633\u0646\u0633\u062a\u062e\u062f\u0645 \u0628\u0639\u062f \u0630\u0644\u0643 \u0627\u0644\u062f\u0627\u0644\u0629 printcp()<\/strong> \u200e \u0644\u0637\u0628\u0627\u0639\u0629 \u0646\u062a\u0627\u0626\u062c \u0627\u0644\u0646\u0645\u0648\u0630\u062c:<\/span><\/p>\n
 #build the initial tree\n<\/span>tree <- rpart(survived~pclass+sex+age, data=ptitanic, control=rpart. control<\/span> (cp= .0001<\/span> ))\n\n#view results<\/span>\nprintcp(tree)\n\nVariables actually used in tree construction:\n[1] age pclass sex   \n\nRoot node error: 500\/1309 = 0.38197\n\nn=1309 \n\n      CP nsplit rel error xerror xstd\n1 0.4240 0 1.000 1.000 0.035158\n2 0.0140 1 0.576 0.576 0.029976\n3 0.0095 3 0.548 0.578 0.030013\n4 0.0070 7 0.510 0.552 0.029517\n5 0.0050 9 0.496 0.528 0.029035\n6 0.0025 11 0.486 0.532 0.029117\n7 0.0020 19 0.464 0.536 0.029198\n8 0.0001 22 0.458 0.528 0.029035\n<\/span><\/span><\/strong><\/pre>\n
 \u0627\u0644\u062e\u0637\u0648\u0629 3: \u062a\u0642\u0644\u064a\u0645 \u0627\u0644\u0634\u062c\u0631\u0629<\/strong><\/span><\/p>\n
 \u0628\u0639\u062f \u0630\u0644\u0643\u060c \u0633\u0646\u0642\u0648\u0645 \u0628\u062a\u0642\u0644\u064a\u0645 \u0634\u062c\u0631\u0629 \u0627\u0644\u0627\u0646\u062d\u062f\u0627\u0631 \u0644\u0644\u0639\u062b\u0648\u0631 \u0639\u0644\u0649 \u0627\u0644\u0642\u064a\u0645\u0629 \u0627\u0644\u0645\u062b\u0644\u0649 \u0644\u0627\u0633\u062a\u062e\u062f\u0627\u0645\u0647\u0627 \u0641\u064a cp (\u0645\u0639\u0644\u0645\u0629 \u0627\u0644\u062a\u0639\u0642\u064a\u062f) \u0627\u0644\u062a\u064a \u062a\u0624\u062f\u064a \u0625\u0644\u0649 \u0623\u0642\u0644 \u062e\u0637\u0623 \u0641\u064a \u0627\u0644\u0627\u062e\u062a\u0628\u0627\u0631.<\/span><\/p>\n
 \u0644\u0627\u062d\u0638 \u0623\u0646 \u0627\u0644\u0642\u064a\u0645\u0629 \u0627\u0644\u0645\u062b\u0644\u0649 \u0644\u0640 cp \u0647\u064a \u0627\u0644\u0642\u064a\u0645\u0629 \u0627\u0644\u062a\u064a \u062a\u0624\u062f\u064a \u0625\u0644\u0649 \u0623\u062f\u0646\u0649 \u062e\u0637\u0623 x<\/strong> \u0641\u064a \u0627\u0644\u0625\u062e\u0631\u0627\u062c \u0627\u0644\u0633\u0627\u0628\u0642\u060c \u0648\u0627\u0644\u0630\u064a \u064a\u0645\u062b\u0644 \u0627\u0644\u062e\u0637\u0623 \u0641\u064a \u0627\u0644\u0645\u0644\u0627\u062d\u0638\u0627\u062a \u0645\u0646 \u0628\u064a\u0627\u0646\u0627\u062a \u0627\u0644\u062a\u062d\u0642\u0642 \u0645\u0646 \u0627\u0644\u0635\u062d\u0629.<\/span> <\/p>\n
 #identify best cp value to use\nbest <- tree$cptable[which. min<\/span> (tree$cptable[,\" xerror<\/span> \"]),\" CP<\/span> \"]\n\n#produce a pruned tree based on the best cp value\n<\/span>pruned_tree <- prune<\/span> (tree, cp=best)\n\n#plot the pruned tree\n<\/span>prp(pruned_tree,\n    faclen= 0<\/span> , #use full names for factor labels\n    extra= 1<\/span> , #display number of obs. for each terminal node\n    roundint= F<\/span> , #don't round to integers in output\n    digits= 5<\/span> ) #display 5 decimal places in output\n<\/span><\/span><\/span><\/strong><\/pre>\n
\"\u062a\u0635\u0646\u064a\u0641<\/p>\n
 \u064a\u0645\u0643\u0646\u0646\u0627 \u0623\u0646 \u0646\u0631\u0649 \u0623\u0646 \u0627\u0644\u0634\u062c\u0631\u0629 \u0627\u0644\u0645\u0634\u0630\u0628\u0629 \u0627\u0644\u0646\u0647\u0627\u0626\u064a\u0629 \u062a\u062d\u062a\u0648\u064a \u0639\u0644\u0649 10 \u0639\u0642\u062f \u0637\u0631\u0641\u064a\u0629. \u062a\u0634\u064a\u0631 \u0643\u0644 \u0639\u0642\u062f\u0629 \u0637\u0631\u0641\u064a\u0629 \u0625\u0644\u0649 \u0639\u062f\u062f \u0627\u0644\u0631\u0643\u0627\u0628 \u0627\u0644\u0630\u064a\u0646 \u0644\u0642\u0648\u0627 \u062d\u062a\u0641\u0647\u0645 \u0648\u0643\u0630\u0644\u0643 \u0639\u062f\u062f \u0627\u0644\u0646\u0627\u062c\u064a\u0646.<\/span><\/p>\n
 \u0639\u0644\u0649 \u0633\u0628\u064a\u0644 \u0627\u0644\u0645\u062b\u0627\u0644\u060c \u0641\u064a \u0627\u0644\u0639\u0642\u062f\u0629 \u0627\u0644\u0645\u0648\u062c\u0648\u062f\u0629 \u0641\u064a \u0623\u0642\u0635\u0649 \u0627\u0644\u064a\u0633\u0627\u0631 \u0646\u0631\u0649 \u0623\u0646 664 \u0631\u0627\u0643\u0628\u064b\u0627 \u0644\u0642\u0648\u0627 \u062d\u062a\u0641\u0647\u0645 \u0648\u0646\u062c\u0627 136.<\/span> <\/p>\n
\"\u062a\u0641\u0633\u064a\u0631<\/p>\n
 \u0627\u0644\u062e\u0637\u0648\u0629 4: \u0627\u0633\u062a\u062e\u062f\u0645 \u0627\u0644\u0634\u062c\u0631\u0629 \u0644\u0639\u0645\u0644 \u062a\u0646\u0628\u0624\u0627\u062a.<\/strong><\/span><\/p>\n
 \u064a\u0645\u0643\u0646\u0646\u0627 \u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0627\u0644\u0634\u062c\u0631\u0629 \u0627\u0644\u0645\u0634\u0630\u0628\u0629 \u0627\u0644\u0646\u0647\u0627\u0626\u064a\u0629 \u0644\u0644\u062a\u0646\u0628\u0624 \u0628\u0627\u062d\u062a\u0645\u0627\u0644\u064a\u0629 \u0628\u0642\u0627\u0621 \u0631\u0627\u0643\u0628 \u0645\u0639\u064a\u0646 \u0639\u0644\u0649 \u0642\u064a\u062f \u0627\u0644\u062d\u064a\u0627\u0629 \u0628\u0646\u0627\u0621\u064b \u0639\u0644\u0649 \u0641\u0626\u062a\u0647 \u0648\u0639\u0645\u0631\u0647 \u0648\u062c\u0646\u0633\u0647.<\/span><\/p>\n
 \u0639\u0644\u0649 \u0633\u0628\u064a\u0644 \u0627\u0644\u0645\u062b\u0627\u0644\u060c \u0631\u0627\u0643\u0628 \u0630\u0643\u0631 \u0639\u0645\u0631\u0647 8 \u0633\u0646\u0648\u0627\u062a \u0648\u0641\u064a \u0627\u0644\u062f\u0631\u062c\u0629 \u0627\u0644\u0623\u0648\u0644\u0649 \u0644\u062f\u064a\u0647 \u0627\u062d\u062a\u0645\u0627\u0644 \u0627\u0644\u0628\u0642\u0627\u0621 \u0639\u0644\u0649 \u0642\u064a\u062f \u0627\u0644\u062d\u064a\u0627\u0629 11\/29 = 37.9%.<\/span> <\/p>\n
\"\u062a\u0635\u0646\u064a\u0641<\/p>\n
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