# How to Calculate the Mean by Group in SAS

You can use the following methods to calculate the mean of values by group in SAS:

Method 1: Calculate Mean by One Group

```proc sql;
select var1, mean(var2) as mean_var2
from my_data
group by var1;
quit;
```

Method 2: Calculate Mean by Multiple Groups

```proc sql;
select var1, var2, mean(var3) as mean_var3
from my_data
group by var1, var2;
quit;```

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

```/*create dataset*/
data my_data;
input team \$ position \$ points;
datalines;
A Guard 15
A Guard 12
A Guard 29
A Forward 13
A Forward 9
A Forward 16
B Guard 25
B Guard 20
B Guard 34
B Forward 19
B Forward 3
B Forward 8
;
run;

/*view dataset*/
proc print data=my_data;```

## Example 1: Calculate Mean by One Group

The following code shows how to calculate the mean of points by team:

```/*calculate mean of points by team*/
proc sql;
select team, mean(points) as mean_points
from my_data
group by team;
quit;
```

From the output we can see that players on team A scored a mean of 15.66667 points and players on team B scored a mean of 18.16667 points.

## Example 2: Calculate Mean by Multiple Groups

The following code shows how to calculate the mean of points, group by team and position:

```/*calculate mean of points, grouped by team and position*/
proc sql;
select team, position, mean(points) as mean_points
from my_data
group by team, position;
quit;```

The resulting table shows the mean of points scored by players based on their team and position.