Hello,

I am working with a multiple linear regression model. I have to test wether my model meets the conditions of OLS. However I run into problems with parameters of the test.

My model looks like this: reg fh_ipolity2 wdi_gdpcapcon2010_log former_colony_k british_colony_k oil_gas_rents_pct wdi_expmil pwt_pop if year>=1974 & year<=1988 & pwt_pop>=1


When I run something like a acpr-plot I cannot apply those "if" parameters. What is the best scientifically correct way of handling this problem?
Do I run the acpr-plot for all years and population size, and then just assume this apply for my model aswell, or do i recode variables to only contain data within my year range?

Thank you in advance