Population Census 2021 Quality Assessment Hong Kong
"Explore the comprehensive details of the 2021 Population Census in Hong Kong conducted by the Census and Statistics Department. Learn about the data collection methods, measures taken to reduce the impact of COVID-19, and the historical background of census-taking in the region."
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Presentation Transcript
Quality Assessment in 2021 Population Census Hong Kong, China November 2021 Census and Statistics Department Hong Kong Special Administrative Region 1
Background information It is an established practice since 1961 for Hong Kong to conduct a population census once every 10 years. Population Census Population By-census By-censuses are conducted in the middle of the intercensal period. 1961 1966 1st post-war population census 1971 1976 1981 1986 1991 1996 2001 2006 2011 Latest population census 2016 2021 Census and Statistics Department Hong Kong Special Administrative Region 2
Basic design 2021 Population Census Short Form Questionnaire ~90% household Long Form Questionnaire ~10% household Simple enumeration Detailed enquiry Census and Statistics Department Hong Kong Special Administrative Region 3
Multi-modal data collection approach Face-to-face interviews via mobile tablets Online questionnaires Postal returns (for Short Forms only) Telephone interviews Census and Statistics Department Hong Kong Special Administrative Region 4
Multi-modal data collection approach (Contd) 1stPhase: 23 June 17 July 2021 (25 days) Self-enumeration Online questionnaires (OQ) Postal returns of short form questionnaire Contact the Census Service Centres Telephone interviews (expanded capacity) 2ndPhase: 18 July 4 August 2021 (18 days) Enumerators to visit households that have not completed questionnaires Using mobile tablets to assist in face-to-face interviews OQ, postal returns and telephone interviews still available Census and Statistics Department Hong Kong Special Administrative Region 5
Other measures to reduce the impact of COVID-19 Enhancing response rate Safety of census officers and respondents Appeal letters delivered by enumerators to solicit response by telephone interview COVID-19 testing for census officers Social-distancing protective supplies for census officers guidelines and Enhanced publicity targeted at specific groups: Elderly Different races Households living units in subdivided Census and Statistics Department Hong Kong Special Administrative Region 6
Quality assurance in 2021 Census Post Enumeration Survey Quality checks Independent exercise Data validation Revisit / Re-call of a random sample of respondents to verify key information Conducted by permanent field staff Training and Supervision Validation rules in OQ, CATI and CAPI systems Joint visits by chief enumerators Revisit of quarters reported as vacant, demolished construction-in- progress or unoccupied Comprehensive data validation implemented in data processing systems Submitted questionnaires checked by chief enumerators Census and Statistics Department Hong Kong Special Administrative Region 7
A framework for assessing quality Completed cases Partially completed cases Response rate By different types of quarters (including sub- divided units) By different enumeration modes No. of visit attempts before successful enumeration Time of census return (beginning vs end of data collection period) Process quality Response pattern Visit pattern Census and Statistics Department Hong Kong Special Administrative Region 8
A framework for assessing quality (contd) Editing rates Quality checks Post Enumeration Survey Error rate Output quality Imputation rate of data items Assessment of under/over-reporting in different age-sex groups and small areas Imputation Admin data Census and Statistics Department Hong Kong Special Administrative Region 9
Thank you Census and Statistics Department Hong Kong Special Administrative Region 10
