Is it advisable to drop certain levels of a categorical variable?
6089
Can I ignore coefficients for non-significant levels of factors in a linear model?
24298
Justification for low/high or tertiary splits in ANOVA
37433
How to build a predictive model when more levels of a categorical predictor are possible than appear in the training data
60423
Are there concerns with doing a generalized additive model with a smoothing term of multiple variables?
128980
How to deal with factors with rare levels in cross-validation?
71974
Is it feasible to transform each variable differently while doing multiple regression
95262
Can I still use logistic regression if some variables are not applied to all the observational units?
89478
Can a dichotomous variable (yes/no) be merged with a Likert measure (1,2,3,4) using z scores?
9080
What is the benefit of breaking up a continuous predictor variable?
75754
Is it OK to remove outliers from data?
104675
heatmap-like plot, but for categorical variables
1348
Is there a difference between 'controlling for' and 'ignoring' other variables in multiple regression?
72632
Changing threshold in logistic regression
104756
Categorical ordinal data: which test is better?
127865
Regression with only categorical variables
134322
How to encode categorical variables for neural networks
50030
Does it make sense to interact 2 dummy variables?