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How to create sample of rows using ID column in R?
To create sample of rows using ID column, we can use sample function. We would need to apply the sample function on ID column and take the subset of rows with the help of single square brackets.
For example, if we have a data frame called df that contains an ID column say ID then we can sample 4 rows of df using ID column as follows −
df[sample(df$ID,4),]
Example 1
Following snippet creates a sample data frame −
Emp_ID<-1:20 Salary<-sample(20000:50000,20) df1<-data.frame(Emp_ID,Salary) df1
Output
The following dataframe is created −
Emp_ID Salary 1 1 34189 2 2 30385 3 3 32484 4 4 42169 5 5 34809 6 6 30039 7 7 40836 8 8 27534 9 9 39775 10 10 25075 11 11 37880 12 12 43213 13 13 44057 14 14 33249 15 15 49177 16 16 34334 17 17 32384 18 18 33653 19 19 21515 20 20 29009
To sample five rows of df1 based on Emp_ID column, add the following code to the above snippet −
Emp_ID<-1:20 Salary<-sample(20000:50000,20) df1<-data.frame(Emp_ID,Salary) df1[sample(df1$Emp_ID,5),]
Output
If you execute all the above given snippets as a single program, it generates the following output −
Emp_ID Salary 9 9 39775 16 16 34334 19 19 21515 20 20 29009 11 11 37880
Example 2
Following snippet creates a sample data frame −
Student_ID<-sample(1:10,20,replace=TRUE) Score<-sample(1:10,20,replace=TRUE) df2<-data.frame(Student_ID,Score) df2
Output
The following dataframe is created −
Student_ID Score 1 3 8 2 10 1 3 5 6 4 1 10 5 1 1 6 4 2 7 2 3 8 6 10 9 9 3 10 1 4 11 7 3 12 4 1 13 4 3 14 1 8 15 2 8 16 7 8 17 7 4 18 4 4 19 1 3 20 10 1
To sample five unique rows of df2 based on Student_ID column, add the following code to the above snippet −
Student_ID<-sample(1:10,20,replace=TRUE) Score<-sample(1:10,20,replace=TRUE) df2<-data.frame(Student_ID,Score) df2[sample(unique(df2$Student_ID),5),]
Output
If you execute all the above given snippets as a single program, it generates the following output −
Student_ID Score 7 2 3 3 5 6 9 9 3 4 1 10 2 10 1
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