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In light of journals like the AER disallowing the use of significance stars, one might want to display the difference column(s) as mean difference with its appropriate standard error to allow readers their own inference. I've implemented this. Specifying the option
SETtest
adds standard errors in parentheses. This option does not work in combination with PTtest. I've done a reasonable amount of testing, but of course the use of this code is as always at your own peril.