# Cross-validation and LASSO plot

I am not sure about some parts of the following plots:

-- I do not understand what does the expression on x-axis means (first figure) and how to interpret that.

-- What is the bars and the points in figure 2 and 3 refer to.

Thanks,

• It's impossible to answer this question without knowing what software and commands you used to create the plots. – Sycorax says Reinstate Monica Aug 12 '16 at 19:34
• I used "lars" function that available in R program, I just would like to understand it generally. what do they mean ? – Ereck Aug 12 '16 at 19:35
• Because I'm sure you read the documentation before posting this question, what part of the lars documentation is unclear to you? – Sycorax says Reinstate Monica Aug 12 '16 at 19:35
• @ General Abrial, Of course, but I don,t know about the expression on x-axis (figure 1) – Ereck Aug 12 '16 at 19:38
• The lars function isn't in base R, so it must be in some package, but you haven't specified one. Please add a reproducible example for people to work with. Then this will be answerable. – gung - Reinstate Monica Aug 12 '16 at 20:07

1. The x-axis is the size of the coefficient relative to the $L_1$ norm of the coefficient vector.... probably. I'm assuming that you created that plot with the default plot commands in lars and this is what the documentation describes.
• 1- so, is this expression related to the value of the penalty term $\lambda$ ,and what is max $\beta$ here. 2- some people said the red point is MSE for resulting model and other said is cross-validation curve. are they equivalent to the mean estimates , also mean estimates of what? Thanks – Ereck Aug 12 '16 at 20:28