Hello,

I am doing my thesis but i could use some help with the statistical part.
I combined two datasets X1 and X2. I received a comment that i had to check if X1 and X2 are different.
I should do this by inlcuding a dummy for X1, but i do not know how to, is someone able to help?

I would like to thank you for your time,

Kind regards,

Piet