Hello everyone,
For my PhD papers, I am running a model with the interaction term between GDP per capita and immigration status (native born=1 reecent immigrant=2, and long resiging immigrant=3). The dependent variable is dummy of anxiety disorder (yes=0 and no=1). In this case, I have first mean centered the original GDP per capita variable and placed it in the model. However, the cosntant and 95% CI for immigrant category appeared very big (constant 709 and upper limit of CI is with 6 digits). Then, I log transferred the GDP per capita and placed it in the model. The same results appeared. Finally, I mean centered the log transferred GDP per capita and palced it in the model. The model appeared to be fine.
So, I am looking for any supporting documents concerning whether I can mean center a long transferred variable. However, I am not finding out any document.
I will appreciate if you kindly help me with this respect.
Your suggestion will be very helpful for my project.
Thank you in advance,
Iqbal Chowdhury
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