mozambique carlos c. singano post-enumeration survey – requirements, planning, designing and...

Mozambique Carlos C. Singano

Post-Enumeration Survey – Requirements, Planning,

Designing and Executing

Adis Ababa Workshop 14-18 September 2009

Carlos Creva Singano, National Statistic Office, Mozambique -Maputo

Carlos C. Singano Mozambique Maputo 2

1. Requisite qualities of PES

• All Census questionnaires must be returned from the field in all EA to National Statistic Office, before the

PES field enumeration.

• The processing of the PES data must be separate from the general Census of Population and Housing

processing Data;

• The PES staff must go to the field without knowing the preliminary results of the respective EA;

• To take the advantage of General Census enumerators and supervisors, they must be used as

the field staff;


2. Costs /Other resources

• The costs must be fixed based on the sample size, mainly at the first stage of sampling ( that is, nº of PSU to be selected)

as well as the nº of Domains of Estimation;• The items to be included in the global cost are:

-Transportation (Vehicles & its maintenance) - Field staff (PES enumerators; PES supervisors; PS

Drivers); - Office Personnel (Matching clerks, matching

Supervisors, Data Entry operators, Data Entry supervisors) - Printing and Reproduction (Questionnaires; Manuals,

Maps, List of EA, etc)


3.Organization structure/Technical planning

• Depend on the Political and administrative structure:

• Mozambique: - NSO (Central Level- Sample Design, Budget and its distribution by

province according to the sample size); - Provincial Level ( Only for execution of the central directives; controlling the field staff and financial matters); To control the Quality

in the enumeration in the dual system;

• In Mozambique, the Province is a domain of estimation. The sample must be representative of strata within each province;

• In each 11 Provinces, the NSO has a Provincial NSO for Operations issues.


4.Procedure for Covarage analysis

• There are Three Procedures for evaluation Census coverage in PES: Procedures A, B and C ( See Manual “ Evaluating

Censures of Population and Housing”;

• Mozambique used the procedure C, where the goal was to identify all current member of the sample HH as the 2007

PES date; in addition, any other resident as of the Reference Date of the General 2007 census of Population and Housing.

• These persons are classified as either non-mover, out-mover and in-mover (that is, to identify immigrants and

emigrants), with regard to their HH memberships status as of the 2007 Census Date.

• In the 2007 Census records, only the Residents as the Date of the 2007 Census (the Non-movers and the

Out-Movers), were matched.


• 2007 PES Status Mozambique

- Non-mover;

- Out-mover;

- In-Mover;

- Bor After

Some Definition: Those who belonged to the HH as of the 2007 General Census

and still as of the 2007 PES are the “Non-Movers”; Those who became members of a different HH during the interim

period between the 2007 General Census and the 2007 PES are the “Movers”. There are two types of Movers:

The “In-Movers” - those who arrived in the HH after 2007 Census;

The “Out-Movers” - those who have left the HH since the 2007 Census.

4. Procedure for Covarage analysis (Cont.)


Persons who do not belong to the target population, that is, the population as of the 2007 Census date are considered

“Out-of-scope”. This includes persons born after the 2007 census or persons who died before the 2007 Census,aliens and nonresidents. No match is attemted or Out-of Scope.

4. Procedure for Covarage analysis (Cont.)(Some Definitions)


5.Organization structure/Technical planning (Sample Size and Domain of estimation)

• Depending on the main objectives to be measure (the coverage error or, the net omission rate), the geographic

domains of analysis and financial resources, the sample size is fixed;

• In Mozambique, the Domains of estimation are: Provinces; National and national Urban and national Rural;

• The 2007 PES of Moz follow a Stratified Cluster sampling of 340 PSU: Minimal of 30 PSU by Province and Maxim of 40

PSU in Maputo, Capital of Mozambique. All unit of analysis (HH, persons, etc) in each sample PSU were interviewed;

• Sample designing for 95 percent of Confidence;


5.Sample Size and Domain of estimation (Cont.)

Total Urbano RuralNiassa 30 8 22Cabo Delgado 30 6 24Nampula 30 8 22Zambézia 30 5 25Tete 30 5 25Manica 30 9 21Sofala 30 14 16

Inhambane 30 7 23Gaza 30 8 22Maputo Província 30 21 9Maputo Cidade 40 40 0

MOÇAMBIQUE 340 131 209

Province/Domain of Estimation

Nº of PSU or EAs, 2007 PES


5.Sample Size, Domain of estimation and estimates(Cont.)• Within each Province, the sample was stratified by urban

and rural areas;

• The Sample selection within each strata was selected independently with PPS. Measure of size was the nº of

household within each strata;

• Using the Dual system methodology (Procedure C), coverage and sampling errors were estimated. The national coverage error was 2.1 per cent. The Programme used were CENVAR

(The IMPS Component) to main variables (eg, Age, sex, marital status, etc).

• David Megill, The U.S.Census Bureau statistician, did help the Mozambican staff to do it;


5. Sample Size, Domain of Estimation and estimates(Cont.)

• 95 percent confidence intervals for the Census omission rate were estimated;


6. Sampling Frame and Units of Analysis

• Methodology of 2007 Moz PES: Two-way HHs and HHs Members;

• The target universe included only the individual households in Mozambique;

• Quarters groups were excluded of the scope;

• The units of analysis in Mozambique 2007 PES were Households members


6.Sampling Frame and Units of Analysis

• Distribution of the HH in Mozambique by Province and area of

residence. Preliminary Results

Total Urban Rural

Province HHs. HHs. % HHs. %

% Urban 1997

Census Niassa 258,090 61,175 23.7% 196,915 76.3% 20.3% Cabo Delgado 406,418 72,744 17.9% 333,674 82.1% 14.9% Nampula 951,523 261,848 27.5% 689,675 72.5% 23.0% Zambézia 918,808 155,391 16.9% 763,417 83.1% 13.8% Tete 427,126 58,820 13.8% 368,306 86.2% 13.3% Manica 276,251 69,057 25.0% 207,194 75.0% 26.6% Sofala 346,589 151,591 43.7% 194,998 56.3% 40.3% Inhambane 297,956 87,248 29.3% 210,708 70.7% 20.0% Gaza 251,185 74,707 29.7% 176,478 70.3% 23.4% Maputo Província 276,936 177,962 64.3% 98,974 35.7% 57.7% Maputo Cidade 222,285 222,285 100.0% 0 0.0% 100.0% Moçambique 4,633,167 1,392,828 30.1% 3,240,339 69.9% 26.3%


6. Sampling Frame and Units of Analysis

Total Urban Rural0-9 Hhs. 281 85 19610-19 Hhs. 446 59 38720-49 Hhs. 5,008 629 4,37950-99 Hhs. 19,133 3,637 15,496100-149 Hhs. 13,789 4,252 9,537150-199 Hhs. 4,253 1,813 2,44200-299 Hhs. 1,578 685 893300-499 Hhs. 338 154 184500-999 Hhs. 58 30 281000-1999 Hhs. 35 9 262000 Hhs. + 8 3 5Total 44,927 11,356 33,571

HHs in the Frame Nº of PSUs or Eas

• Distribution of the PSU or EAS by Size oh HHs in Mozambique by Province and area of residence. Preliminary Results


• The Sampling frame is stratified by Province Urban and rural;

• The objective of this stratification is to improve the PES Sample Design;

• The PSU or EA within each strata was selected by PPS. The number of HH within each was the measure of size.

• An implicity stratification by political subdivision (OER Cod, CA_Cod and EA_Cod) was done before sample selection

within each strata;

6. Sampling Frame, Units of Analysis, Sample Selection Methodology


7. Development of Questionnaire and field manuals

• The Moz PES questionnaire was based on the final 2007 General census of Population and Housing Questionnaire;

• The 1997 PES (Moz) and the 1991 PES (Ruanda) were used as Reference;

• Demographics characteristics included in 2007 PES: Marital status, age, sex and relationships to the head of the

HH and the section A of the General Census, that is, the location

and area of residence of the HH to facility the matching process;

To facility the comparability between 2007 Census data and 2007 PES data, same response categories and precoding

system were used;


• To facility the field team (enumerators and supervisors), a small Manual with instructions, definitions was prepared;

• The PES data collection aims were to identify all usual residents at the time of the 2007 Census in addition to those as of the date of the 2007 PES ( Procedure C in Slide 5-6).

7. Development of Questionnaire and field

manuals (Cont.)


8. Budgeting/ Pilot test • The 2007 PES Budget Was planned as part of the 2007

census program;

• The 2006 PES Pilot was care out to test the Dual System methodology (Procedure C) of the 2007 Census of

Population and Housing. This was done during the Pilot General Census of Population and Housing in 2006;


9. Selection and training of field staff/ data collection

• To take the advantage of 2007 General Census enumerators and supervisors, those were used as the field staff of 2007

PES;• They were trained during two days in each province.

• The 2007 PES data collection did take place 15 days after 2007 General Census data collection. The objective was to minimize the matching difficulties processes related to the

changes to the composition of the HHs between the two Dates.


10. Omission rates for 2007 Census of Population and Housing

Inferior Sup

Mozambique .021 .002 .017 .024 .077 19.469 155819

Area of Residence

Urban .021 .002 .017 .025 .105 11.554 74867Rural .020 .002 .016 .024 .101 23.162 80952

ProvinceNiassa .037 .008 .020 .053 .229 16.520 11894Cabo Delgado .019 .005 .008 .029 .289 15.943 10086Nampula .027 .004 .019 .035 .156 22.377 12326Zambézia .013 .003 .007 .019 .220 17.445 11184Tete .015 .003 .009 .021 .198 6.996 10609Manica .016 .005 .007 .025 .299 17.400 14529Sofala .030 .009 .012 .047 .296 40.461 16461Inhambane .027 .007 .012 .042 .279 21.112 12621Gaza .007 .001 .005 .010 .142 1.354 11978Maputo Province .017 .003 .012 .023 .173 5.975 18508Maputo City .016 .002 .012 .021 .135 2.851 25623

CV DeffNº of casesDomain/ Province

Estimate

Standard Deviation

95 % Confidence Interval

Carlos C. Singano Mozambique Maputo

End

Kanimambo

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