Contents
Article 6Detailed sample characteristics#
1.At least three attempts shall be made to contact a respondent before they are dropped from the survey, except in the following situations:
(a)the address was impossible to locate;
(b)the address was non-residential or unoccupied;
(c)the person was not found at the address;
(d)the person was unable to respond, including for reasons of incapacity;
(e)a definite refusal of the person to cooperate was received;
(f)the circumstances were endangering the interviewer’s safety.
2.In duly justified cases, and only to the extent necessary, controlled substitution shall be allowed. Controlled substitutions of sample units (households or persons) shall be allowed, if one of the situations listed in paragraph 1 arises, or if the sample unit has not been reached after three attempts for contact.
3.Procedures shall be followed to ensure that the process of substitution is controlled to the maximum extent possible. Such procedures shall include using a design which ensures that the selected substitutes closely match the persons they replace in terms of their significant characteristics.
4.The set of sample persons for substitution shall be defined prior to data collection. There shall be no substitution with persons not belonging to that set.
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