Two sample t test

[JUMMY]

I have a variable listed as follows:

Smoker: 1=never, 2=former, 3=current

How do I perform a two-sample t-test on a variable XX to examine the differences in former and current smokers (excluding those who never smoked from the analysis) in sas? I used the following code:

Data have;

set want;

proc sort;

by smoker;

run;

run;

proc ttest data=have alpha=0.05;

var XX;

class smoker;

run;

How do I make exclusions from the variable smoker?

[mcgaugh]

The quickest and easiest way to do that is add a where statement to your proc ttest if you want to keep all three levels in your "want" dataset.

proc ttest data=have alpha=0.05;

var XX;

class smoker;

where smoker in (2,3);

run;

https://twitter.com/epi_chic/status/983120587236225025

https://twitter.com/epi_chic/status/983120587236225025