Workshop on Census Evaluation for Countries in Asia EVALUATION OF 2009 POPULATION AND HOUSING CENSUS DATA Presented by Nguyen Van Hung and Phan Thi Minh Hien General statistics office of Viet Nam

Outline Introduction of 2009 population and housing census in Viet Nam Some major findings of the census Evaluation of the census data

Introduction of 2009 population and housing census  Reference time of 0 hour on 1 st April, 2009  Time for field work: 10 days  This is the fourth official population census since Viet Nam got reunification in 1975  The 2009 population and housing census enumerated all Vietnamese regularly residing in the territory of Viet Nam and Vietnamese citizens travel oversea “but still within authorized time”

Introduction (cont)  Method of enumeration is direct interview  First time use scanning technology for data entry: the preliminary results published on August 2009, completed results published on July 2010  A census sample survey was conducted at once in order to enlarge the content of the census  Size of the survey is 15% of total population of the country. This ensures to be representative to district level about basic information

Introduction (cont)  The entire country was divided into 172,000 enumeration areas (EA) with average size of one EA is about 100 households  Mapping and listing conducted for all EAs, each EA has one sketch map and one list of housholds  One EA, one enumerator  Two types of questionnaires were used in the 2009 Census: short form was for the completed enumeration areas and long form was for sample enumeration areas  Data of the census used as official data source. Data of population size used as official data for budget allocation of National Assembly

Some major findings of the 2009 census

 Population density is 259 persons/1km2. Vietnam is one of the most densely populated countries in the region and in the world  LE in 2009 for males is 70.2 years and for female is 75.6 years

Sex ratio About 3.8 Vietnames people died in the wars from 1955 to 1975

Viet Nam is indeavouring to control the indicator. Some drafted policies aim to encourage married couples give female birth

 Has reached replacement fertility level in 2006 and control fertility  Family planning policy: from 1961 to 1993 each married couple should have maximum of 3 children.  From 1993 to now: each married couple should only have from 1 to 2 childs

Evaluation of census data  Right after completion of the census, a post enumeration survey (PES) was conducted to define completeness and accuracy of the census data. 60 enumeration areas were randomly selected for re-interview  Purpose of this survey is to evaluate completeness of the census (estimate coverage errors)  Results of the post-enumeration survey indicated a net error rate of -0.3%

 Two indice used to assess age heaping, namely Whipple’s index and Myer blended index  The results indicated that almost no rounding to 0 or 5 is found in age data Evaluation of age heaping

Evaluation of mortality data  Information of fertility, mortality and migration is in long form questionaire  In general, fertility and mortality data collected in sample surveys face problem of missing data, especially infant mortality  It is necessary to apply indirect estimation methods

Evaluation of mortality data (cont)  Use Brass method to estimate mortality indicators with support of QFIVE software  Two methods of the General Growth Balance (GGB) and Synthetic Extinct Generations (SEG) have been used to evaluate coverage of death information of the entire population  The results showed that the adequacy of data on deaths collected in the 2009 Census is relatively low. Adequacy for the death of male population is 67% and that of female population is 54%

Thank you for your kind attention