I have a stata program that displays a twoway bar graph and I want to add a t-test to the program, but the t-test has to be optional. I am a bit confused because I was under the impression that the program syntax applied to the command that was being used, in this case -twoway bar-. Can you put the t-test into the program syntax with [] to specify that the t-test is optional or is there some other argument farther into the code that I need to use to specify that the t-test is optional?