what is it called when a covariate is always present? when centered, is the coefficient of the sample always absent when are covariates always missing what is the sparse covariate why does missingness occur when centered which is the sparse covariate that must be used to fit my model? what covariates do logistic regression use what makes sense of using a sparse covariate how to center sparse logistic regression logistic regression centered on mean when centered the covariate on the mean how does logistic regression work? logistic regression what is the correct centering of the covariate? logistic regression definitions why do you center sparse covariates? why centered when using sparse covariate when is a sparse logistic regression used why don't you use sparse covariates when to use sparse covariates why do you center a covariate when a variable is always absent