Hi
In which instant I can use BY or CLASS in the Proc Means procedure
in SAS prep guide, Scenario 7, they asked to:
Use PROC MEANS to calculate the mean and standard deviation for the variables AvgHighTemp and AvgLowTemp by the new Month variable.
In the code they use CLASS instead of BY
Q: How do I know when to use CLASS or BY, Please help me to understand
data work.scenario7;
set cert.temp18;
format Day date9.;
Month=month(day);
run;
proc freq data=work.scenario7;
tables HighTemp;
run;
proc means data=work.scenario7;
class month;
var AvgLowTemp AvgHighTemp;
run;