The objective in donor imputation is to fill in the missing values for a given unit by copying observed values of another unit, the donor. Typically, the donor is chosen in such a way that it resembles the imputed unit as much as possible on one or more background characteristics. The rationale behind this is that if the two units match (exactly or approximately) on a number of relevant auxiliary variables, it is likely that their scores on the target variable will also be similar.
To read the entire document, please access the pdf file (link under "Related Documents" on the right-hand-side of this page).
Your feedback is appreciated. Please send your remarks, suggestions for improvement, etc. to firstname.lastname@example.org.