What Is Multicollinearity?
Multicollinearity is a term used to describe when two or more independent variables in a regression model are highly correlated. When multicollinearity occurs, the model will have a high variance, and the coefficients on the independent variables will be unstable. This is because the regression model may not be able to distinguish between changes in one independent variable and changes in the other. This can lead to inconsistent results and incorrect predictions.
What causes multicollinearity?
The cause of multicollinearity can be a combination of multicollinearity and autocorrelation. Multicollinearity is usually caused by the presence of heteroskedasticity, which is when the variance in the error terms is not constant. This can occur when there are significant differences between the dependent and independent variables.
Why is multicollinearity a problem?
Multicollinearity is a problem because it can make it difficult to know which variables have the most effect on a certain outcome. If a variable is highly correlated with another, it’s difficult to isolate which one has the most effect on the outcome of interest. This makes it difficult to know what exactly is going on when trying to predict or analyze data.