Here are the two most common ways to select a simple random sample of rows from a dataset in SAS:

**Method 1: Select Random Sample Using Sample Size**

**proc surveyselect data=original_data
out=random_sample
method=srs /*specify simple random sampling as sampling method*/
sampsize=3 /*select 3 observations randomly*/
seed=123; /*set seed to make this example reproducible*/
run;
**

**Method 2: Select Random Sample Using Proportion of Total Observations**

**proc surveyselect data=original_data
out=random_sample
method=srs /*specify simple random sampling as sampling method*/
samprate=0.2 /*select 20% of all observations randomly*/
seed=123; /*set seed to make this example reproducible*/
run;**

The following examples show how to use each method with the following dataset in SAS:

**/*create dataset*/
data original_data;
input team $ points rebounds;
datalines;
Warriors 25 8
Wizards 18 12
Rockets 22 6
Celtics 24 11
Thunder 27 14
Spurs 33 19
Nets 31 20
Mavericks 34 10
Kings 22 11
Pelicans 39 23
;
run;
/*view dataset*/
proc print data=original_data;**

**Example 1: Select Random Sample Using Sample Size**

The following code shows how to select a random sample of observations from the dataset using a sample size of n=3:

**/*select random sample*/
proc surveyselect data=original_data
out=random_sample
method=srs
sampsize=3
seed=123;
run;
/*view random sample*/
proc print data=random_sample;**

We can see that three rows were randomly selected from the original dataset.

**Example 2: Select Random Sample Using Proportion of Total Observations**

The following code shows how to select a random sample of observations from the dataset by using the **samprate** function to specify that we’d like the random sample to represent 20% of all original observations:

**/*select random sample*/
proc surveyselect data=original_data
out=random_sample
method=srs
samprate=0.2
seed=123;
run;
/*view random sample*/
proc print data=random_sample;
**

We can see that 20% of the total observations (20% * 10 observations = **2**) from the original dataset were randomly selected to be in our sample.

**Additional Resources**

The following tutorials explain how to perform other common tasks in SAS:

How to Use Proc Summary in SAS

How to Rename Variables in SAS

How to Create New Variables in SAS