Definition: Systematic error
Definition 1: Error reported consistently over time and/or between responding units.
Definition 2: Type of error for which the error mechanism and the imputation procedure are known.
Definition 3: Systematic deviation of the estimate from the true value.
Eurostat, "Memobust Glossary" (part of the Memobust Handbook on Methodology of Modern Business Statistics), ESSnet "Memobust", March 2014