Which of the following is the national level system that provides annual national as well as state level reliable estimates of fertility and mortality?
Sample registration system
Census
Ad-hoc survey
Sample registration system
Sample Registration System (SRS) was initiated in 1964–65 (on a pilot basis; full scale from 1969–70) to provide national as well as state level reliable estimates of fertility and mortality
• SRS is a dual record system:
Field Investigation: continuous enumeration of births and deaths by an enumerator.
Independent retrospective survey: every 6 months by an investigator-supervisor.