Im a little confused by some results I have.....
I have two predictor variables and an outcome variable. The first predictor is positively correlated with the outcome variable (r = 0.8, p < 0.05) and the second predictor negatively correlated with the outcome variable (r = -0.6, p < 0.05). Simple linear regression also identified a positive and negative relationship for the first and second predictors, respectively.
However, when conducing a multiple regression the beta coefficients for the predictors are BOTH positive. How is this possible? The relationship between the second predictor and the outcome variable is clearly negative so how would I get positive coefficients?
Any explanation/advice would be most welcome.....
I have two predictor variables and an outcome variable. The first predictor is positively correlated with the outcome variable (r = 0.8, p < 0.05) and the second predictor negatively correlated with the outcome variable (r = -0.6, p < 0.05). Simple linear regression also identified a positive and negative relationship for the first and second predictors, respectively.
However, when conducing a multiple regression the beta coefficients for the predictors are BOTH positive. How is this possible? The relationship between the second predictor and the outcome variable is clearly negative so how would I get positive coefficients?
Any explanation/advice would be most welcome.....