2009 population and housing census in vietnam phnompenh, cambodia, 14-17 november 2011

General Statistics Office of Vietnam

2009 POPULATION AND HOUSING

CENSUS IN VIETNAM

Phnompenh, Cambodia, 14-17 November 2011

United Nations Sub-regional Workshop on Census Data Evaluation

1. Brief introduction of

census taking in Vietnam


- Census taking dating back many centuries.

- The first real census of an independent Vietnam was

conducted late in 1979.

- Internationally recognized census concepts, design

features and processing, was conducted in April 1989.

- The third census was conducted in April 1999.

- The last population and housing census has been

conducted in 2009 with a reference time of the census is

00.00 hours, 1 April 2009.

Census in Vietnam Population Census History in Vietnam


- The 2009 Census was conducted under the Prime

Minister’s Decision No. 94/2008/QD-TTg on 10/7/2008.

- Its main objective was to collect the basic data on

population and housing of Vietnam to provide services for

researching and analyzing.

- A survey of 15 percent of the national population has been

included to expand the census coverage, reduce the cost.

- Intelligent Character Recognition (ICR) has been adopted

for data capture instead of manual data entry via keyboard.

2009 Census The Census Preparation and Legal Authority


- Face-to-face interview.

- Two questionnaires were used: a completed (short)

questionnaire and a sample (long) questionnaire.

+ Contents of the completed questionnaire:

++ Information on population

++ Dwellings of households

2009 Census Contents of the Census Questionnaire


+ Contents of the sample questionnaire:

++ Information on population

++ Birth history of women aged 15-49 years

++ Information on deaths

++ Dwellings of households

2009 Census Contents of the Census Questionnaire (contd)


Questionnaires and materials formally used in the census

have undergone three pre-tests and one pilot before being

applied in the actual census.

2009 Census Pre-test and Pilot Census


- Sketch maps and household listings is a basis for:

+ Distributing census resources.

+ Guiding enumerators to households.

+ Locating materials, questionnaires and stationery.

- Whole country is divided into about 172,000 EAs.

- Two types of maps: base maps and EA maps.

2009 Census Mapping and household listing


- Set up a plan for the publicity campaign of the census.

- It was launched in March 2009, reaching its crescendo

during 15 March to 20 April 2009.

- It was broadcasted on radio and TV, in daily newspapers

both centrally and locally and even on the radio systems of

the village and urban-blocks.

- Telephone hot-lines were installed in both central areas

and localities.

2009 Census Census Publicity


- Enumerators were assigned according to specific

geographical conditions and EA size.

- Team leaders were appointed to directly manage

enumerators’ work.

- There were supervisors at the central, provincial and

district levels

- All census participants have been trained very carefully.

2009 Census

Recruitment and Training

of the Census Officials


- Used ICR technology to input information directly from

questionnaires to computers instead of using keyboards.

- Success of ICR technology will be the premise for its

application in other statistics surveys.

- The GSO in co-operation with computer Company have

build software, organized training courses, tested

systems, and finalized the software package for new TIS

and e-Form software.

2009 Census Data Processing and Tabulation


- Preliminary results were released in early August 2009.

- Expanded sample results were published in December

2009.

- Completed results were disseminated in June 2010.

- Some in-depth monographs will be printed in late 2010.

2009 Census The Census Data Dissemination


2. Overview of evaluation of census data


Post enumeration survey


THE POST ENUMERATION SURVEY (PES) IN VIET NAM 2009

* Census time: 0h, April 01, 2009 . Duration of the main fieldwork: from 1 –15

April * PES time: 0h, April 01, 2009. Duration of the PES fieldwork : from 5 – 30

May, 2009



After finishing enumeration, post enumeration survey (PES) were conducted to define the completeness and accuracy of the census data. A set of 60 EA’s were randomly selected for re-interview which was directly organized and conducted by the Office of the Central Population and Housing Census Steering Committee.

The Office of the Central Population and Housing Census Steering Committee established 6 PES teams, one PES team for one region. Each PES team contains 5 persons: The team leader was selected from the department of

population and labor statistics 3 interviewers were selected from Provincial census

office and 1 driver from General Statistics Office, included .



In the PES, to define the completeness of the census, each usual household member was asked 4 questions: (1) full name; (2) Relationship with the head of household; (3) sex ; (4) month and year of birth or age. The responses of the PES have been compared with the census questionnaires to find data missing in the census enumeration or in the PES.

We consider that the PES result is the completeness result, hence: the PES result shows both the undercount rate and over – count rate.



We collected 4 measures: * N1 -The total number of persons were recorded in

census form. * N2 -The total number of persons were recorded in

PES form (It is a very exact record). * n1 – The number of persons were recorded in

census form only, not recorded in PES forms. That is the number of persons of over count

* n2 – The number of persons were recorded in PES form only, not recorded in census forms. That is the number of persons of under count .



The PES result of 2009 census in Viet Nam shows that the error rate is 0.3% (under count rate minus over count rate), Equivalent to about 258,000 people )

Regions Over count

rate (%)

Under count rate (%)

Net error (undercount rate – over count rate)

Whole country1.Northern Midlands and Mountain Areas2. Red River Delta3.North Central Area and Central Coastal Area4.Central Highlands5.South East6. MeKong River Delta

1.82.72.81.11.50.71.8

1.52.02.10.92.00.81.6

-0.3-0.7-0.7-0.2 0.5 0.1-0.2


Demographic methods used in

2009 census


Population size Some main indicators: Completed Result

30

,17

2

34

,92

9

41

,06

3

49

,16

52

,74

2

64

,37

6

76

,32

3

85

,84

7

0

10

20

30

40

50

60

70

80

90

100

'60 '65 '70 '76 '79 '89 '99 '09 Year

Millions

Total population of Vietnam at 0:00 on 01 April, 2009 was 85.846.997 persons


From 1979 – 2009, Vietnam population is transfering from young structure into old structure.

Some main indicators: Completed Result

0-4

5-9

10-14

15-19

20-24

25-29

30-34

35-39

40-44

45-49

50-54

55-59

60-64

65-69

70-74

75-79

80+

0-4

5-9

10-14

15-19

20-24

25-29

30-34

35-39

40-44

45-49

50-54

55-59

60-64

65-69

70-74

75-79

80+

0-4

5-9

10-14

15-19

20-24

25-29

30-34

35-39

40-44

45-49

50-54

55-59

60-64

65-69

70-74

75-79

80+

0-4 5-9

10-14

15-1920-2425-29

30-3435-39

40-4445-4950-54

55-5960-6465-69

70-7475-79

80+

1979 1989

1999 2009

Pyramid


According to the Population Model of the United Nations, Vietnam is in a period of “Population

Bonus”

Population

structure

33,1

61,1

5,8

24,5

69,1

6,4

0

10

20

30

40

50

60

70

80

< 15 ages 15-64 ages > 65 ages Age group

Percentage

1999

2009

Some main indicators: Completed Result


Aging Index has increased; Dependent Ratio has continuously declined.

Population structure

0

20

40

60

80

100

1979 1989 1999 2009 Year

Percentage

Dependent Ratio

Aging Index


Vietnam’s fertility is under the Replacement Fertility Level

Fertility and Mortality Trend

CBR (%o)

TFR (children

per woman)

CDR(%o)

IMR(%o)

1999 19.9 2.3 5.636.7

2009 17.6 2.0 6.8 16


-TFR is usually estimated indirectly using the Trussell P/F ratio technique with the assumption that the number of children born in the period 12 months prior to the survey among women age 15 to 49 years are underreported.

- CBR is calculated indirectly by taking the crude birth rates directly from the survey and multiplying by the Trussell P/F ratio adjustment factor.

Method to estimate fertility and mortality


-The General Growth Balance method (GGB) and Synthetic Extinct Generation (SEG) methods were

used to assess and adjust data on reported deaths. The GGB method requires three major assumptions: (1) a closed population, that is a population not or

only slightly affect by migration, (2) invariant coverage of population and deaths by age; and (3) accurate recording of age for both population and

deaths. -The problem of changes in census coverage may

be resolved by combining the SEG and GGB methodologies.




Sex

Relative completeness of mortality reporting by methodology, 2009

census

GGB SEG Combined GGB – SEG

Male 72 71 67

Female 65 53 54



The United Nations has computerized indirect estimation of mortality through the software MORTPAK. In this software package, the CEBCS procedure is used for estimating 1q0 and the MATCH procedure for estimating e0. After applying the CEBCS procedure over a period of time, software programmers made adjustments made to some coefficients in the regression equation for estimating q(a) mentioned above and developed a new software called QFIVE to estimate 1q0 and 4q1.


Challenges facing while conducting

census evaluation


-Indirect technique requires some assumption, such as the method to estimate fertility requires TFR is still high. Now, TFR is becoming lower and lower.

Therefore, we need to develop that method.- The method to estimate mortality met many

difficulties. The combined BBG-SEG method can apply for whole country estimation (not affected by

migration). For province level, it was quite not appropriate. So we need to know another method.

- IMR now is becoming lower and lower, so the method to separate IMR by Coal Denemy model is

not suitable.

General Statistics Office of Vietnam

THANK YOU FOR

YOUR KIND ATTENTION

2009 population and housing census in vietnam phnompenh, cambodia, 14-17 november 2011

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