why is it difficult to impute grain yield? why does iterative regression imputation work? can you impute biomass how do I calculate imputation coefficients for missing data when to calculate residual residual in regression can you use the same regression model for grain yield can you impute grain yield if i can impute a missing variable in a regression analysis why i cannot imputation for grain yield can i use multiple regression which of the following is an important outcome variable of a imputation? why can't we impute grain yield to biomass can you impute biomass from a study why do imputation models fail to include a missing variable? in which case, the model of the variable that is imputed is how to use vcv to imputation why is it difficult for a covariate to be imputed to a study how to iterate regression on an outcome variable can you impute grain yield from different studies? can i impute biomass yield if you impute a missing variable what does the effect size of the effect size of the variable mean