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    Multiple Linear Regression (Actual Vs Predicted)

    Hi forum, I am new to statistics and R in general so please bear with me if I am not clear enough. So I am generating a 3 level full factorial design with 4 variables (P, P1, P4, INJ), and three responses (qo, qw, qg) which I am using in order to run a multiple linear regression on in R. I have...