# Questions tagged [ridge-regression]

A regularization method for regression models that shrinks coefficients towards zero.

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### Multicollinearity Market mix modeling

I want to know what can be the best approach to handle multicollinearity. I am building a regression model with just 4 independent but all important variables and am not able to control the VIF. ...
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### How do the ridge or lasso coefficient changes when we add more variables

Suppose we run ridge or lasso regression over a bunch of features. And now suppose we add one more feature into the regressions. What will happen to the coefficients of the "old" features? I ...
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### Is it possible to create a 0 intercept ridge regression model?

I am working on implementing ridge regression for market mix modeling where I wish to use my own create base(UCM) instead of intercept, I had been using linear regression for this purpose but now my ...
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### Ridge and Lasso regression coefficient change when we change the scales of the variables

I am interested in the following question: suppose we run a ridge of a lasso model on a bunch of variables. Now if we multiple one of the variables $x_1$ by 2, what happens to the coefficients. Some ...
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### Centering vs standardizing in ridge regression

I have read that to apply ridge regression, we first need to standardize the predictive variables. That is because the variables should be in a homogenous scale so that lambda has an effect of the ...
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### How does ridge regression reduce the variance of the estimates of $\beta$

In the scikit-learn library, Ridge class, there is a note that reads: "Regularization improves the conditioning of the problem and reduces the variance of the estimates." Given the ...
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### Is standarization necessary for ridge regression?

Is variable normalization necessary in Ridge regression (for both X and y)? If so, what happens (mathematically) if we don't do it?
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### What does it say about the data if ridge regression is not reducing multicollinearity?

I am predicting the salary to be offered to a new candidate for which I am concentrating on just continuous (9 in number) variables. Variables are as attached. When I ran OLS the coefficient for total ...