指定間隔的因子級別

Question

我有一個連續的變量，我想變成一個因素。

數據是：

DCA<-c(0.14,0.14,0.16,0.16,0.27,0.27,0.07,0.07,0.41,0.41,0.00,0.00,0.33,0.33,0.11,0.11,0.64,0.64,0.28,0.28,0.02,0.02,0.43,0.43,0.24,0.24,0.08,0.08,0.00,0.00,0.64,0.64,0.07,0.07,0.16,0.16,0.24,0.24,0.26,0.26,0.64,0.64,0.22,0.22,0.03,0.03,0.03,0.03,0.35,0.35,0.35,0.35,0.37,0.37,0.37,0.37,0.22,0.22,0.00,0.00,0.33,0.33,0.19,0.19,0.33,0.33,0.33,0.33,0.02,0.02,0.36,0.36)

我知道你可以快速做到這一點

DCA.f<-factor(DCA)

但這會為每個獨特的價值創造因素。 我想指定因子水平，以便水平

0，小於或等於0.10，大於0.10且小於或等於0.20，依此類推，直到大於0.50。

我認為這必須在因子函數的“級別”中指定，但我不知道如何指定我在上面描述的內容。

Answer 1

看看cut ：

cut(DCA, c(-Inf, seq(0, .5, .1), Inf))
#  [1] (0.1,0.2]  (0.1,0.2]  (0.1,0.2]  (0.1,0.2]  (0.2,0.3]  (0.2,0.3]  (0,0.1]   
#  [8] (0,0.1]    (0.4,0.5]  (0.4,0.5]  (-Inf,0]   (-Inf,0]   (0.3,0.4]  (0.3,0.4] 
# [15] (0.1,0.2]  (0.1,0.2]  (0.5, Inf] (0.5, Inf] (0.2,0.3]  (0.2,0.3]  (0,0.1]   
# [22] (0,0.1]    (0.4,0.5]  (0.4,0.5]  (0.2,0.3]  (0.2,0.3]  (0,0.1]    (0,0.1]   
# [29] (-Inf,0]   (-Inf,0]   (0.5, Inf] (0.5, Inf] (0,0.1]    (0,0.1]    (0.1,0.2] 
# [36] (0.1,0.2]  (0.2,0.3]  (0.2,0.3]  (0.2,0.3]  (0.2,0.3]  (0.5, Inf] (0.5, Inf]
# [43] (0.2,0.3]  (0.2,0.3]  (0,0.1]    (0,0.1]    (0,0.1]    (0,0.1]    (0.3,0.4] 
# [50] (0.3,0.4]  (0.3,0.4]  (0.3,0.4]  (0.3,0.4]  (0.3,0.4]  (0.3,0.4]  (0.3,0.4] 
# [57] (0.2,0.3]  (0.2,0.3]  (-Inf,0]   (-Inf,0]   (0.3,0.4]  (0.3,0.4]  (0.1,0.2] 
# [64] (0.1,0.2]  (0.3,0.4]  (0.3,0.4]  (0.3,0.4]  (0.3,0.4]  (0,0.1]    (0,0.1]   
# [71] (0.3,0.4]  (0.3,0.4] 
# 7 Levels: (-Inf,0] (0,0.1] (0.1,0.2] (0.2,0.3] (0.3,0.4] ... (0.5, Inf]

您可能希望自定義第二個參數（“ breaks ”）來表示您實際查找的中斷，以及查看可以傳遞給cut函數的其他一些參數。