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法律研究如何在 R 向量的調查中用序數字符串替換數字？
替換數字用序數字符串的最簡單方法是使用 ifelse 函式。R 中的 ifelse 函式的作用是 ifelse(test_expression, x, y)。其中，test_expression 必須為邏輯向量，或可強制轉換為邏輯型別。返回值是與 test_expression 長度相同的向量。
示例 1
> x1<-sample(0:1,100,replace=TRUE) > x1
輸出
[1] 1 1 1 0 1 0 0 1 1 1 0 0 1 0 1 0 0 1 1 0 0 1 1 1 1 0 0 0 0 1 1 1 0 1 1 0 1 [38] 0 1 1 0 0 1 0 1 1 1 1 0 1 0 1 0 0 1 0 1 0 0 1 1 1 0 0 0 1 0 1 1 1 1 1 0 1 [75] 1 1 0 0 0 1 1 0 0 0 0 1 0 1 0 1 0 0 0 0 0 1 1 0 1 1
示例
> x1<-ifelse(x1==0,"No","Yes") > x1
輸出
[1] "Yes" "Yes" "Yes" "No" "Yes" "No" "No" "Yes" "Yes" "Yes" "No" "No" [13] "Yes" "No" "Yes" "No" "No" "Yes" "Yes" "No" "No" "Yes" "Yes" "Yes" [25] "Yes" "No" "No" "No" "No" "Yes" "Yes" "Yes" "No" "Yes" "Yes" "No" [37] "Yes" "No" "Yes" "Yes" "No" "No" "Yes" "No" "Yes" "Yes" "Yes" "Yes" [49] "No" "Yes" "No" "Yes" "No" "No" "Yes" "No" "Yes" "No" "No" "Yes" [61] "Yes" "Yes" "No" "No" "No" "Yes" "No" "Yes" "Yes" "Yes" "Yes" "Yes" [73] "No" "Yes" "Yes" "Yes" "No" "No" "No" "Yes" "Yes" "No" "No" "No" [85] "No" "Yes" "No" "Yes" "No" "Yes" "No" "No" "No" "No" "No" "Yes" [97] "Yes" "No" "Yes" "Yes"
示例 2
> x2<-sample(-1:1,100,replace=TRUE) > x2
輸出
[1] 1 0 0 0 -1 1 0 1 -1 -1 -1 0 1 -1 0 0 0 -1 1 0 0 1 1 1 0 [26] 0 -1 -1 1 0 1 1 -1 1 -1 1 0 0 -1 1 1 1 -1 1 0 -1 -1 0 -1 -1 [51] 1 1 0 1 1 1 0 -1 -1 0 1 0 1 -1 -1 -1 -1 1 1 1 -1 -1 -1 -1 1 [76] 1 0 -1 0 1 -1 -1 -1 0 -1 1 1 -1 1 0 -1 1 1 -1 -1 -1 0 1 0 0
示例
> x2<-ifelse(x2==-1,"Low",ifelse(x2==0,"Medium","High")) > x2
輸出
[1] "High" "Medium" "Medium" "Medium" "Low" "High" "Medium" "High" [9] "Low" "Low" "Low" "Medium" "High" "Low" "Medium" "Medium" [17] "Medium" "Low" "High" "Medium" "Medium" "High" "High" "High" [25] "Medium" "Medium" "Low" "Low" "High" "Medium" "High" "High" [33] "Low" "High" "Low" "High" "Medium" "Medium" "Low" "High" [41] "High" "High" "Low" "High" "Medium" "Low" "Low" "Medium" [49] "Low" "Low" "High" "High" "Medium" "High" "High" "High" [57] "Medium" "Low" "Low" "Medium" "High" "Medium" "High" "Low" [65] "Low" "Low" "Low" "High" "High" "High" "Low" "Low" [73] "Low" "Low" "High" "High" "Medium" "Low" "Medium" "High" [81] "Low" "Low" "Low" "Medium" "Low" "High" "High" "Low" [89] "High" "Medium" "Low" "High" "High" "Low" "Low" "Low" [97] "Medium" "High" "Medium" "Medium"
示例 3
> x3<-sample(1:3,100,replace=TRUE) > x3
輸出
[1] 2 1 3 2 3 1 2 1 2 2 3 1 3 2 3 3 3 3 1 3 3 2 1 1 1 3 1 2 1 3 1 2 2 1 2 1 3 [38] 3 1 3 3 2 2 3 1 3 3 2 1 1 2 3 2 2 3 3 3 2 2 2 3 3 2 3 1 3 2 1 1 3 1 1 1 2 [75] 3 1 2 3 2 3 2 1 1 1 2 3 3 2 2 2 2 2 1 3 3 2 2 2 3 1
示例
> x3<-ifelse(x3==1,"First",ifelse(x3==2,"Second","Third")) > x3
輸出
[1] "Second" "First" "Third" "Second" "Third" "First" "Second" "First" [9] "Second" "Second" "Third" "First" "Third" "Second" "Third" "Third" [17] "Third" "Third" "First" "Third" "Third" "Second" "First" "First" [25] "First" "Third" "First" "Second" "First" "Third" "First" "Second" [33] "Second" "First" "Second" "First" "Third" "Third" "First" "Third" [41] "Third" "Second" "Second" "Third" "First" "Third" "Third" "Second" [49] "First" "First" "Second" "Third" "Second" "Second" "Third" "Third" [57] "Third" "Second" "Second" "Second" "Third" "Third" "Second" "Third" [65] "First" "Third" "Second" "First" "First" "Third" "First" "First" [73] "First" "Second" "Third" "First" "Second" "Third" "Second" "Third" [81] "Second" "First" "First" "First" "Second" "Third" "Third" "Second" [89] "Second" "Second" "Second" "Second" "First" "Third" "Third" "Second" [97] "Second" "Second" "Third" "First"
示例 4
> x4<-sample(1:5,80,replace=TRUE) > x4
輸出
[1] 4 5 2 4 5 2 1 2 3 2 3 2 2 2 2 4 4 5 1 5 3 4 1 4 1 5 2 1 4 1 5 1 4 4 2 1 5 3 [39] 4 4 2 5 1 3 4 2 2 2 4 1 5 5 5 2 1 1 3 4 1 4 5 3 4 4 1 4 2 4 4 3 3 1 5 5 2 2 [77] 1 4 2 3
示例
> x4<-ifelse(x4==1,"Very Satisfied",ifelse(x4==2,"Satisfied",ifelse(x4==3,"Neutral",ifelse(x4==3,"Dissatisfied","Very Dissatisfied")))) > x4
輸出
[1] "Very Dissatisfied" "Very Dissatisfied" "Satisfied" [4] "Very Dissatisfied" "Very Dissatisfied" "Satisfied" [7] "Very Satisfied" "Satisfied" "Neutral" [10] "Satisfied" "Neutral" "Satisfied" [13] "Satisfied" "Satisfied" "Satisfied" [16] "Very Dissatisfied" "Very Dissatisfied" "Very Dissatisfied" [19] "Very Satisfied" "Very Dissatisfied" "Neutral" [22] "Very Dissatisfied" "Very Satisfied" "Very Dissatisfied" [25] "Very Satisfied" "Very Dissatisfied" "Satisfied" [28] "Very Satisfied" "Very Dissatisfied" "Very Satisfied" [31] "Very Dissatisfied" "Very Satisfied" "Very Dissatisfied" [34] "Very Dissatisfied" "Satisfied" "Very Satisfied" [37] "Very Dissatisfied" "Neutral" "Very Dissatisfied" [40] "Very Dissatisfied" "Satisfied" "Very Dissatisfied" [43] "Very Satisfied" "Neutral" "Very Dissatisfied" [46] "Satisfied" "Satisfied" "Satisfied" [49] "Very Dissatisfied" "Very Satisfied" "Very Dissatisfied" [52] "Very Dissatisfied" "Very Dissatisfied" "Satisfied" [55] "Very Satisfied" "Very Satisfied" "Neutral" [58] "Very Dissatisfied" "Very Satisfied" "Very Dissatisfied" [61] "Very Dissatisfied" "Neutral" "Very Dissatisfied" [64] "Very Dissatisfied" "Very Satisfied" "Very Dissatisfied" [67] "Satisfied" "Very Dissatisfied" "Very Dissatisfied" [70] "Neutral" "Neutral" "Very Satisfied" [73] "Very Dissatisfied" "Very Dissatisfied" "Satisfied" [76] "Satisfied" "Very Satisfied" "Very Dissatisfied" [79] "Satisfied" "Neutral"
更新於：19-11-2020
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