Hi Guys! I have computed the mean of growth rate of 34 countries before and after a particular period and I am interested in testing the difference between the two means. Someone please help me out with the command. For simplicity this is how I computed the means (

**sum gdpr if hipc == 0 ; sum gdpr if hipc == 1)**. With these two commands I have gotten two means and would like to test the significance of their difference.NB: in my data set HIPC is a dummy variable.
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