如何在 R 中创建一个频率表，其中包含不可用值的零频率？
当我们在R中使用表函数时，输出显示向量或数据框列中可用值的频率。如果我们想为不属于向量或列的值创建频率为零的表，那么首先我们需要先将它们转换为因子，然后使用table函数。
示例1
x1<−c(1,1,1,1,1,1,1,2,2,2,2,2,3,3,3,3,4,4,4,4,6,6) x1<−factor(x1,levels=c(1:6)) table(x1)输出结果
x1 1 2 3 4 5 6 7 5 4 4 0 2
例2
x2<−sample(c(1,2,3,5,6,7),200,replace=TRUE) x2输出结果
[1] 2 3 1 7 7 2 3 5 5 3 1 3 7 6 7 2 6 3 2 1 1 1 5 7 3 6 6 5 5 5 5 2 2 7 7 6 3 [38] 7 1 6 2 7 3 6 5 2 6 7 7 2 3 1 3 3 7 1 1 5 7 5 3 1 6 2 3 1 2 5 3 3 1 3 7 2 [75] 1 6 2 1 6 7 7 2 1 3 7 6 7 6 3 5 6 7 7 7 3 3 2 6 2 1 3 7 6 1 3 5 5 3 7 1 3 [112] 2 1 2 3 1 3 6 3 3 5 3 2 2 7 7 6 3 2 2 3 5 3 7 6 6 6 6 2 7 1 7 7 5 3 6 5 3 [149] 5 1 6 2 5 5 1 6 3 6 3 6 5 5 1 1 6 3 3 7 2 3 5 3 1 1 7 1 3 2 3 3 7 7 7 3 5 [186] 1 3 7 6 7 5 3 6 3 6 1 1 1 3 7
示例
x2<−factor(x2,levels=c(1:7)) table(x2)输出结果
x2 1 2 3 4 5 6 7 32 26 48 0 26 31 37
例3
x3<−sample(c(0,1,2,4,5,6),500,replace=TRUE) x3输出结果
[1] 5 4 4 6 6 4 2 2 5 0 1 1 1 1 0 2 2 1 0 1 5 2 4 5 0 5 4 2 5 2 6 0 1 6 4 2 4 [38] 6 0 6 2 6 5 1 6 0 0 2 4 2 4 5 4 4 0 1 5 1 5 6 4 2 5 4 5 6 0 2 1 1 2 4 5 2 [75] 6 0 4 0 5 5 0 2 5 6 1 5 6 2 6 2 0 0 1 6 2 2 5 6 1 5 5 6 1 1 6 5 1 6 5 2 2 [112] 4 0 1 4 4 0 6 0 4 5 6 5 2 4 5 5 0 4 2 1 4 5 5 1 2 5 2 4 4 2 1 6 0 0 2 5 6 [149] 2 6 0 0 1 1 4 6 2 1 2 1 1 6 0 4 6 6 4 1 5 0 5 1 0 0 6 6 1 6 5 4 2 2 1 6 1 [186] 0 0 1 4 4 4 4 1 0 5 1 0 1 1 5 1 4 1 5 1 0 0 5 6 5 0 0 0 4 5 1 6 2 5 6 1 2 [223] 5 6 6 4 6 5 1 6 6 2 0 5 6 5 5 5 2 4 1 6 2 2 0 6 6 5 4 5 4 4 4 5 6 0 2 5 1 [260] 6 5 6 6 2 6 2 0 0 5 4 4 4 0 4 1 6 5 5 1 4 6 4 5 4 6 6 1 4 0 2 1 5 6 2 2 5 [297] 1 5 2 1 1 6 2 2 0 6 5 0 1 6 4 2 5 0 2 5 0 2 0 1 6 5 1 2 6 0 2 6 5 4 5 5 0 [334] 2 5 0 2 1 4 0 2 5 6 6 1 2 2 5 5 5 1 0 4 4 0 2 0 0 2 0 4 2 5 6 0 5 5 2 5 1 [371] 4 5 0 5 6 6 6 4 6 6 5 2 5 5 4 6 5 1 1 6 6 2 0 1 5 6 4 1 0 5 5 2 6 5 0 4 4 [408] 6 4 0 6 2 2 5 6 2 2 5 4 5 0 6 0 4 1 6 0 2 2 6 2 2 2 5 0 2 1 5 5 1 0 4 6 5 [445] 1 5 5 1 1 6 2 0 1 5 2 6 4 4 5 2 1 6 1 5 4 5 0 4 6 1 0 4 0 4 1 1 2 4 5 6 2 [482] 1 1 0 1 0 1 5 5 5 5 2 6 6 5 2 1 5 2 2输出结果
x3<−factor(x3,levels=c(0:6)) table(x3)输出结果
x3 0 1 2 3 4 5 6 74 80 84 0 71 104 87
例4
x4<−sample(c(0,1,2,5),500,replace=TRUE) x4输出结果
[1] 0 0 5 0 0 0 0 2 2 2 1 5 0 1 1 1 2 5 1 5 2 5 5 0 1 2 0 1 1 5 1 5 0 0 1 2 2 [38] 2 0 2 2 0 2 1 2 2 2 1 2 5 1 1 5 0 1 5 2 1 1 0 1 0 5 1 2 2 1 0 0 5 2 2 1 5 [75] 5 0 2 2 2 0 5 0 2 2 2 5 0 5 1 1 1 5 1 5 2 0 5 2 0 0 5 0 1 1 1 5 5 5 2 1 1 [112] 0 5 2 5 2 1 2 1 5 0 0 0 1 2 2 0 0 1 0 5 5 0 0 1 1 2 5 5 5 1 2 2 0 0 1 1 5 [149] 0 1 5 2 1 0 5 0 5 0 0 2 0 2 2 2 2 2 1 1 2 5 1 1 1 5 5 0 1 1 5 1 2 0 1 2 1 [186] 2 1 5 0 0 0 0 5 0 5 2 5 2 1 0 2 2 2 2 1 5 5 2 0 1 0 1 0 1 0 0 2 0 1 0 5 1 [223] 0 2 0 0 1 2 2 1 5 0 5 5 5 5 2 5 1 0 5 2 0 1 0 5 1 0 5 2 5 0 2 0 2 1 5 5 1 [260] 2 5 0 0 5 0 1 1 1 0 2 0 0 2 2 2 1 0 1 2 2 0 0 0 1 2 0 5 2 5 2 1 1 2 2 1 1 [297] 1 0 0 5 5 5 5 1 5 0 1 5 0 2 5 5 2 5 0 1 0 2 0 1 2 0 1 2 5 5 0 5 0 5 5 1 2 [334] 1 2 1 2 5 2 2 1 2 2 5 1 5 2 5 0 0 1 5 1 1 0 0 0 1 1 0 0 2 1 2 1 1 1 5 1 1 [371] 1 1 1 2 2 2 1 1 1 2 5 2 0 1 1 5 2 5 2 0 0 0 0 5 5 1 0 2 0 5 0 5 0 2 1 0 0 [408] 5 1 1 2 0 5 1 1 0 2 5 0 5 2 5 2 5 2 0 0 5 0 0 0 1 2 5 5 2 2 1 2 2 0 5 1 5 [445] 5 0 1 1 1 1 5 1 5 5 0 1 5 0 1 2 5 0 1 2 0 2 1 5 0 1 1 2 1 0 0 0 1 5 1 5 1 [482] 5 2 0 2 5 5 1 1 0 5 1 2 1 5 2 2 5 1 0
示例
x4<−factor(x4,levels=c(0:5)) table(x4)输出结果
x4 0 1 2 3 4 5 128 135 120 0 0 117
例5
x5<−sample(c(0,1,5,10),500,replace=TRUE) x5输出结果
[1] 1 0 1 0 5 5 10 0 0 1 10 0 0 5 10 1 5 1 10 0 1 0 1 5 1 [26] 5 10 5 10 1 10 1 0 1 1 0 5 5 5 0 10 5 10 5 5 0 5 0 0 1 [51] 0 5 5 0 1 10 10 0 0 1 0 0 0 10 5 0 1 1 0 0 5 10 0 5 1 [76] 10 10 5 1 1 0 0 0 0 0 5 5 0 10 0 10 0 5 0 10 5 0 1 1 5 [101] 0 1 5 1 1 0 0 5 1 10 0 10 5 5 0 1 5 0 10 1 10 10 0 10 0 [126] 5 0 10 5 5 10 10 10 10 10 5 0 5 0 0 0 5 0 10 0 10 5 10 1 0 [151] 10 5 0 10 10 0 5 10 0 0 0 5 5 0 1 5 5 1 5 5 0 10 10 10 1 [176] 0 5 0 0 10 5 5 0 10 10 5 10 0 1 1 1 1 0 0 10 10 1 10 1 5 [201] 1 0 5 10 10 10 1 10 5 5 0 5 10 5 1 5 5 10 5 1 1 0 0 10 0 [226] 0 5 1 1 0 0 1 5 0 10 1 5 0 0 1 10 1 5 0 5 0 5 1 0 5 [251] 1 10 5 0 5 0 1 5 1 1 10 5 10 0 5 0 1 0 0 5 0 5 1 10 10 [276] 0 0 0 10 0 1 5 10 5 5 0 5 5 0 1 5 0 10 1 0 5 1 0 5 0 [301] 1 5 5 1 1 0 10 0 10 10 10 5 10 0 10 5 5 0 5 10 0 10 5 10 5 [326] 0 10 1 0 1 0 1 1 5 1 10 5 0 5 5 5 10 10 10 10 1 10 1 1 10 [351] 5 1 1 1 1 5 0 10 0 10 10 5 10 1 10 5 10 10 10 1 0 0 0 0 10 [376] 5 0 5 0 5 10 1 10 10 1 0 10 10 1 10 1 5 10 0 0 1 0 5 0 0 [401] 5 1 0 10 1 0 10 5 10 5 5 10 0 10 1 0 10 10 1 0 10 0 0 10 10 [426] 5 5 10 1 10 0 5 0 5 1 5 10 5 1 0 5 0 10 0 5 5 5 0 0 10 [451] 5 0 10 5 10 1 5 1 5 0 1 10 5 10 0 1 10 0 0 10 1 1 0 0 5 [476] 0 5 10 5 5 10 5 5 1 5 1 10 1 1 10 0 1 0 1 1 5 1 1 0 10
示例
x5<−factor(x5,levels=c(0:10)) table(x5)输出结果
x5 0 1 2 3 4 5 6 7 8 9 10 144 104 0 0 0 129 0 0 0 0 123