Post-enumeration Survey (PES) - Statistics South Africa

Statistics South Africa
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7.2 Estimation of the net undercount rate
The net undercount (or overcount) is the difference between the estimated true household total and the
census-enumerated household total. The rate is the net undercount expressed as a percentage of the
estimated true total. Net undercount rates, together with their absolute errors and confidence intervals,
are shown in Table 19 for households by geographic classification. The confidence interval is formed
around the estimate by adding or subtracting the absolute error. See Section 5.2 for notes concerning
confidence intervals and absolute errors, and their use in determining any differential undercounts.
In Table 19, it can be observed that the net undercount rate for households at the national level was
estimated at 14,3%.
Table 19: Net undercount rate for households by province – in-scope sub-universe (values
expressed in percentage points rounded to one decimal)
Net undercount
rate
95% confidence interval limits
Standard error
(+ or -) Lower Upper
Category
Province
Western Cape 17,8 0,110 17,58 18,01
Eastern Cape 10,3 0,104 10,08 10,49
Northern Cape 14,8 0,204 14,36 15,16
Free State 9,4 0,143 9,09 9,65
KwaZulu-Natal 16,5 0,096 16,32 16,70
North West 17,0 0,124 16,75 17,24
Gauteng 15,2 0,081 15,01 15,33
Mpumalanga 14,4 0,137 14,18 14,72
Limpopo 9,6 0,078 9,48 9,78
All households 14,3 0,037 14,25 14,40
95% confidence interval limits
Geography type
Net undercount
rate Standard error Lower
Upper
Urban 14,8 0,045 14,74 14,92
Non-urban 13,2 0,066 13,11 13,37
All areas 14,3 0,037 14,25 14,40
*Subject to rounding error
Post Enumeration Survey (PES)