If a factor variable is to be dropped in model selection, should all levels be dropped simultaneously? If so, why?
6089
Can I ignore coefficients for non-significant levels of factors in a linear model?
75278
What is the effect of having correlated predictors in a multiple regression model?
147006
Consequences of unbalanced subgroups of categorical variables in logistic regression?
48892
whether to rescale indicator / binary / dummy predictors for LASSO
53762
Is it meaningful to identify interaction effect when a main effect in a model (main effects only, without interaction terms) is not significant?
39879
Should I remove non-significant variables from my regression model
107315
Does random forest need input variables to be scaled or centered?
51089
Cleaning up factor levels (collapsing multiple levels/labels)
3013
Why does the Lasso provide Variable Selection?
68135
Is it required for panel data to use dummy variables?
25238
Significant predictors become non-significant in multiple logistic regression
27545
Can I probe cross-level interactions without random slope in a hierarchical linear model?
57829
Variables are often adjusted (e.g. standardised) before making a model - when is this a good idea, and when is it a bad one?
77380
How to choose an optimal number of latent factors in non-negative matrix factorization?
20101
What are disadvantages of using the lasso for variable selection for regression?
111567
What if interaction wipes out my direct effects in regression?
110567
How to debug "contrasts can be applied only to factors with 2 or more levels" error?