can the imputation of age be used to compare the independent variables? is age a control variable what is meant by mean imputation can you imputation ages what is meant by mean imputation does imputation cause bias can imputation of age result in bias does ages need to be imputation how does mean imputation affect independent variables? age imputation means when to use mean imputation for ages AGE means imputation when does mean imputation of independent variables occur why do you need to imputation mean age is a dependent variable what is the measure of age? AGE is a control variable and is used only for how to imputation age for independent variables how to imputation ages in a research project age definition