Post-enumeration Survey (PES) - Statistics South Africa

Statistics South Africa
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There was no non-response adjustment at EA level or household level for PES 2011. Hence the
inverse selection probabilities were applied as calculated from the 'PROC SURVEYSELECT'
without any further adjustments.
5.2 Coverage evaluation: Calculation of dual-system estimates for persons
Coverage measures were calculated only for cases belonging to the universe of interest (Section 2.2:
Scope of the PES).
1. The initial estimates – weighted estimates of total from the sample – using Procedure C, are (also
see Figures 1 and 2):
a. total number of non-movers in the universe (P sample);
b. total number of out-movers in the universe (P sample);
c. total number of in-movers in the universe (P sample);
d. total number of matched non-movers in the universe (P sample);
e. total number of matched out-movers in the universe (P sample);
f. estimated total number of matched in-movers in the universe;
Note: in Procedure C, the number of matched in-movers cannot be calculated directly, given that
matching the in-movers in the sample is not attempted. But the 'out-movers' and the 'in-movers'
constitute the same group in the universe: the 'movers', assuming a closed population. Therefore,
an assumption can be made that, in the universe, the match rate for in-movers would be the
same as that for out-movers (estimated by e/b). Hence, the total number of matched in-movers in
the universe is estimated indirectly by [(e/b)*c].
g. total number of census erroneous inclusions in the population (E sample);
h. total number of cases correctly enumerated in the census but missed in the PES (E sample);
i. total number and percentage of census persons with insufficient information (E sample); and
j. total number and percentage of PES erroneous inclusions and PES insufficient information cases
(P sample).
Post Enumeration Survey (PES)