r2 is not used without a constant why is the r2 used without a constant why is an adjusted r2 not used? why is an R2 interpreted in a constant why is adjusted r2 not used why are r2 not used without a constant why is the r2 not used without a constant why is an r2 not used without a constant. why is the r2 of the adjusted r2 not used without a constant? why is the r2 and adjusted r2 not used as constants why is r2 not used how to use the r2 without a constant why not use adjusted r2 why is adjusted r2 not used without a constant why is a p2 not used without a constant what is the r2 used for when there is no constant? why is adjusted r2 not used without a constant why is the constant adjusted r2 not used why is the adjusted r2 used without a constant why is r1 used without a constant