SAS: Calculating Variance of 3 Variables in Homework Statement

[Hummingbird25]

Homework Statement

Howdy I got a datasheet in the SAS data system with 3 variables and 60 obs.

How do I most simply get SAS to calculate the variance?

Homework Equations

The Attempt at a Solution

data cnn;
input vara varb snt@@;
datalines;
...
...
...

run;
proc sort;
by vara;
run;
proc means;
by vara;
run;


Which code to I add to get it to calculate the variance of the three vars??

Thanks in advance
Maria.

 

[mighty2000]

Dear Maria,

To calculate the variance in SAS, you can use the PROC MEANS procedure with the VAR statement. This statement allows you to specify the variables for which you want to calculate the variance. For example, if your variables are vara, varb, and snt, you can use the following code:

proc means data=cnn var;
var vara varb snt;
run;

This will output a table with the variance for each variable. You can also use the VAR statement in conjunction with the BY statement if you want to calculate the variance for each level of a categorical variable. For more information on the PROC MEANS procedure, you can refer to the SAS documentation or seek additional help from your instructor or colleagues.