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Sample characteristics: Iran

Census/survey characteristics
Type Census
Title 2006 General Census of Population and Housing
Statistical agency Statistical Centre of Iran
De jure or de facto De jure
Census/survey day 28 October to 17 November 2006
Questionnaire Form No.2 Household Questionnaire - General types (for most of normal and collective households); Form No.3 Household Questionnaire - General and detailed types (for the rest of normal and collective households and all of unsettled normal households); Form No.4 Institutional Household Questionnaire (for all all institutional households)
Microdata sample characteristics
Sample design Simple random sampling is used to draw samples from private settled and collective households who answered the long household questionnaire. The data were classified into urban and rural areas within counties. The sampling portion in each category was 20%.
Sample fraction 2%
Sample size (person records) 1299825
Sample weights Computed by the Statistical Centre of Iran and should be used for most types of analysis
Units identified in microdata
Dwellings No
Vacant units No
Households Yes
Collective dwellings Yes
Smallest geography Sub-province
Unit definitions
Households People who have a common residence (stable or unstable) and also common expenditures. They need not be related.
Collective dwellings Collective households: People who live in a place as a group, and that place is considered their normal residence.

Institutions: People who live together in an institute due to a common goal or quality, and that institute is considered as their normal residence
Special populations Unsettled population
Census/survey characteristics
Type Census
Title 2011 National Population and Housing Census
Statistical agency Statistical Center of Iran
Population universe The members of all private settled, institutional, and colelctive families whose place of usual residence is located in Iran at the time of the enumeration and also the members of all private unsettled households of the country comprise the population under enumeration.
De jure or de facto De jure
Census/survey day October 23, 2011
Field work period 24 October to 13 November, 2011
Questionnaire Form 2- Household Questionnaire, Form 3 Instiutional household questionnaire. Form 4- Settlement characteristics form
Type of fieldwork The data collection occurred through personal digital assistants in select provinces of Tehran, Alborz, and Gilian. Other areas of the country used paper-based forms.
Microdata sample characteristics
Sample design 2% stratified random sample of urban/rural areas at the county level.
Sample fraction 0.02
Sample size (person records) 1481586
Sample weights Calculated as the inverse of the probability of the household's selection
Units identified in microdata
Dwellings No
Vacant units No
Households Yes
Collective dwellings Yes
Smallest geography Sub-province
Unit definitions
Dwellings Not applicable
Households Individuals who live together in a dwelling, share expenses, and usesually eat togeher.
Collective dwellings Comparised of indiviuals who have chosen to live together because of a characterisitc shared by majority or all of them. For example university dormatories. These households lack a distinct head of household, usually lack kinship, and their composition lacks permanency or stability.