如何在 R 数据框中创建两个因子列的表？
要在R数据框中创建包含两个因子列的表，我们可以使用table函数和with函数。
例如，如果我们有一个名为df的数据框，其中包含两个因子列，比如F1和F2，那么我们可以使用以下命令创建这两列的表-
with(df,table(F1,F2))
示例1
以下代码段创建了一个示例数据框-
Group<-sample(c("G1","G2","G3"),20,replace=TRUE)
Class<-sample(c("First","Second","Third"),20,replace=TRUE)
df1<-data.frame(Group,Class)
df1创建了以下数据框
Group Class 1 G1 First 2 G2 First 3 G3 First 4 G2 First 5 G1 Second 6 G2 Second 7 G3 Second 8 G3 Third 9 G2 First 10 G1 Third 11 G1 Second 12 G3 Second 13 G1 Second 14 G1 Third 15 G2 Second 16 G1 Second 17 G3 Third 18 G1 Second 19 G3 First 20 G1 Third
要在上面创建的数据框中创建列Group和Class的表，请将以下代码添加到上面的代码段中-
Group<-sample(c("G1","G2","G3"),20,replace=TRUE)
Class<-sample(c("First","Second","Third"),20,replace=TRUE)
df1<-data.frame(Group,Class)
with(df1,table(Group,Class))输出结果如果您将上述所有给定的片段作为单个程序执行，它会生成以下输出-
Class Group First Second Third G1 1 5 3 G2 3 2 0 G3 2 2 2
示例2
以下代码段创建了一个示例数据框-
Gender<-sample(c("Male","Female"),20,replace=TRUE)
Sal_Group<-sample(c("<=10K","10K and <=20K","=20K"),20,replace=TRUE)
df2<-data.frame(Gender,Sal_Group)
df2创建了以下数据框
Gender Sal_Group 1 Male =20K 2 Male <=10K 3 Female <=10K 4 Male 10K and <=20K 5 Male <=10K 6 Female <=10K 7 Female 10K and <=20K 8 Female 10K and <=20K 9 Female =20K 10 Male =20K 11 Female 10K and <=20K 12 Male <=10K 13 Male =20K 14 Male =20K 15 Female 10K and <=20K 16 Male 10K and <=20K 17 Female <=10K 18 Female <=10K 19 Male =20K 20 Female 10K and <=20K
要在上面创建的数据框中创建列Gender和Sal_Group的表，请将以下代码添加到上面的代码段中-
Gender<-sample(c("Male","Female"),20,replace=TRUE)
Sal_Group<-sample(c("<=10K","10K and <=20K","=20K"),20,replace=TRUE)
df2<-data.frame(Gender,Sal_Group)
with(df2,table(Gender,Sal_Group))输出结果如果您将上述所有给定的片段作为单个程序执行，它会生成以下输出-
Sal_Group Gender <=10K =20K 10K and <=20K Female 4 1 5 Male 3 5 2
示例3
以下代码段创建了一个示例数据框-
Category<-sample(c("C1","C2","C3","C4"),20,replace=TRUE)
Sample<-sample(1:4,20,replace=TRUE)
df3<-data.frame(Category,Sample)
df3创建了以下数据框
Category Sample 1 C4 4 2 C2 3 3 C2 3 4 C1 3 5 C3 4 6 C1 4 7 C2 1 8 C1 1 9 C1 1 10 C1 2 11 C4 3 12 C1 3 13 C4 2 14 C1 3 15 C4 2 16 C3 4 17 C1 3 18 C2 4 19 C1 2 20 C1 2
要在上面创建的数据框中创建列Category和Sample的表，请将以下代码添加到上面的代码段中-
Category<-sample(c("C1","C2","C3","C4"),20,replace=TRUE)
Sample<-sample(1:4,20,replace=TRUE)
df3<-data.frame(Category,Sample)
with(df3,table(Category,Sample))输出结果如果您将上述所有给定的片段作为单个程序执行，它会生成以下输出-
Sample
Category 1 2 3 4
C1 2 3 4 1
C2 1 0 2 1
C3 0 0 0 2
C4 0 2 1 1