For the 2006 Census four imputation indicator variables have been introduced. They are Imputation Flag for Age (IFAGEP), Imputation Flag for Number of Males and Females in Dwelling (IFNMFD), Imputation Flag for Place of Usual Residence (IFPURP) and Imputation Flag for Registered Marital Status (IFMSTP). Imputation flag variables enable users of Census data to quantify the number of imputed records (for applicable data items; age, registered marital status etc.) in a given population.
See also Derivations and imputations.