BY vs CLASS

souji — Fri, 10 Jan 2020 03:04:04 GMT

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;

Re: BY vs CLASS

unison — Fri, 10 Jan 2020 03:43:49 GMT