IPUMS International

Sample characteristics: India

Census/survey characteristics
Type	Employment survey
Title	Socio-Economic Survey, Household Schedule 10: Employment and Unemployment, January to December, 1983
Statistical agency	National Sample Survey Organization, Government of India
Population universe	Not specified
De jure or de facto	De jure
Census/survey day	January to December 1983
Field work period	One-year period from January to December, 1983
Questionnaire	A single form that consists of 10 sections: 1) identification of sample household, 2) household characteristics, 3) demographic and current activity particulars during the preceding week, 4) demographic characteristics of migrants and their usual activity at the time of migration, 5) current activity of people in the labor force, 6) usual activity, 7) usual subsidiary gainful activity of persons who did not work, but not because of being old or disabled, 8) follow-up questions for persons whose principal activities were working, 9) persons who usually attended domestic duties, and 10) household indebtedness.
Type of fieldwork	Direct interview
Microdata sample characteristics
Sample design	Drawn by the NSSO, details not specified
Sample fraction	.09%
Sample size (person records)	623494
Sample weights	Calculated by the NSSO based on stratified sample design
Units identified in microdata
Dwellings	Yes
Vacant units	No
Households	Yes
Collective dwellings	No
Smallest geography	State
Unit definitions
Households	One of more individuals who normally reside together under the same roof and take food in the same kitchen, including temporary stay aways and excluding temporary visitors.

Census/survey characteristics
Type	Employment survey
Title	Socio-Economic Survey, Household Schedule 10: Employment and Unemployment, July, 1987-June, 1988
Statistical agency	National Sample Survey Organization, Government of India
Population universe	Not specified
De jure or de facto	De jure
Census/survey day	July 1987 to June 1988
Field work period	One-year period from July, 1987 to June, 1988
Questionnaire	A single form that consists of 7 sections: 1) identification of sample household, 2) household characteristics, 3) demographic particulars and current activity during the preceding week, 4) usual activity and migration, 5) usual activity and migration, 6) follow up questions for working persons, and 7) follow up questions for persons who attended domestic duties.
Type of fieldwork	Direct interview
Microdata sample characteristics
Sample design	Two-staged, stratified systematic sample drawn by the country. The first stage units are villages in the rural sector and urban blocks in the urban sector. The second stage units are households in both sectors. States were first divided into agro-economic regions which are groups of contiguous districts, similar with respect to population density and crop pattern. The sample villages have been selected circular systematically with probability proportional to population in the form of two independent interpenetrating sub-samples (IPNS). The sample blocks have been selected circular systematically with equal probability, also in the form of two IPNS. Households were selected circular systematically with a random start from income sub-stratums.
Sample fraction	.09%
Sample size (person records)	667848
Sample weights	Calculated by the NSSO based on stratified sample design
Units identified in microdata
Dwellings	Yes
Vacant units	No
Households	Yes
Collective dwellings	No
Smallest geography	District
Unit definitions
Households	One of more individuals who normally reside together under the same roof and take food in the same kitchen, including temporary stay aways and excluding temporary visitors.

Census/survey characteristics
Type	Employment survey
Title	Socio-Economic Survey, Household Schedule 10: Employment and Unemployment, July, 1993-June, 1994
Statistical agency	National Sample Survey Organization, Government of India
Population universe	All population in India, except for foreigners, the homeless, or people in orphanages, rescue homes, ashram, and vagrant houses.
De jure or de facto	De jure
Census/survey day	July 1993 to June 1994
Field work period	One-year period from July, 1993 to June, 1994
Questionnaire	A single form that consists of 8 sections: 1) identification of sample household, 2) household characteristics, 3) demographic particulars and principal usual activity, 4) current work activity during the preceding week, 5) follow-up questions for the unemployed, 6) questions for working persons, 7) questions for children 5-14 years, and 8) questions for persons who attended domestic duties.
Type of fieldwork	Direct interview
Microdata sample characteristics
Sample design	Two-staged, stratified systematic samples drawn by the country. Stage 1: In rural sector, regions are stratified based on population and crop pattern. Census villages (primary sampling units) are selected from region strata circular systematically with probability proportional to population. In urban sector, districts are stratified by population. Urban frame survey (UFS) blocks are the primary sampling units and selected from district strata circular systematically with equal probability. Stage 2: Selected large villages/blocks are split into hamlet-groups (rural) or sub-blocks (urban), some of which are randomly selected and they form the strata for Stage II, together with small villages/blocks selected in Stage I. Households are selected from those Stage II strata by circular systematically with a random start. Affluent households are over-sampled. The ratio of affluent to other households is 2:8 in rural sector and 4:6 in urban sector. In total, the central sample includes 7,284 villages and 4,792 urban blocks; the state sample includes 7,964 villages and 5,880 urban blocks.
Sample fraction	.07%
Sample size (person records)	564740
Sample weights	Weights calculated by the NSSO based on probability of selection at both levels
Units identified in microdata
Dwellings	Yes
Vacant units	No
Households	Yes
Collective dwellings	No
Smallest geography	State
Unit definitions
Dwellings	Every structure, tent, shelter, etc. is a house irrepective of its use. It may be used for residential or non-residential purpose or both, or even may be vacant.
Households	A group of persons normally living together and taking food from a common kitchen will constitute a household. The members of a household may or may not be related by blood to one another.
Special populations	Persons without any normal residence, foreign nationals, and people in orphanages, rescue homes, ashram and vagrant houses are not covered by survey.

Census/survey characteristics
Type	Employment survey
Title	Socio-Economic Survey, Household Schedule 10: Employment and Unemployment, July, 1999-June, 2000
Statistical agency	National Sample Survey Organization, Government of India
Population universe	All population in India, except for foreigners, the homeless, or people in barracks of military and para-military forces, orphanages, rescue homes, ashram, and vagrant houses.
De jure or de facto	De jure
Census/survey day	July 1999 to June 2000
Field work period	One-year period from July 1st, 1999 to June 30th, 2000. Field work was spread out uniformly over different weeks or months within each of the three-month subround periods.
Questionnaire	A single form that consists of 8 sections: 1) identification of sample household, 2) household characteristics, 3) demographic and migration particulars, 4) usual principal activity, 5) subsidiary activity, 6) current work activity during the preceding week, 5) follow-up questions for the unemployed, 6) availability for work to working persons, 7) job change of working persons, and 8) questions for females.
Type of fieldwork	Direct interview
Microdata sample characteristics
Sample design	Two-stage, stratified samples drawn by the country, coupled with rotation sampling scheme for the central sample. (1) Stage 1: In the central sample, 10,384 first stage units (rural and urban combined) were selected from stratified states in proportion to poluation. Among them, 3,900 of which were revisted. (2) Stage 2: households and enterprises were selected from second-stage strata(hamlet-groups or sub-blocks) by circular systematic sampling with equal probability. (3) Under the rotation sampling scheme which was adopted for the first time in the National Sample Survey, 50% of the sample first stage units in the central sample were revisited in the subsequent three-month period. In state samples, the first stage units were only visited once.
Sample fraction	.07%
Sample size (person records)	596688
Sample weights	Weights calculated by the NSSO based on probability of selection at both levels
Units identified in microdata
Dwellings	Yes
Vacant units	No
Households	Yes
Collective dwellings	No
Smallest geography	District
Unit definitions
Dwellings	Every structure, tent, shelter, etc. is a house irrepective of its use. It may be used for residential or non-residential purpose or both, or even may be vacant.
Households	A group of persons normally living together and taking food from a common kitchen will constitute a household. The members of a household may or may not be related by blood to one another.
Special populations	Persons without any normal residence, foreign nationals, and people in barracks of military and para-military forces, orphanages, rescue homes, ashram and vagrant houses are not covered by survey.

Census/survey characteristics
Type	Employment survey
Title	Socio-Economic Survey, Household Schedule 10: Employment and Unemployment, July, 2004-June, 2005
Statistical agency	National Sample Survey Organization, Government of India
Population universe	All population in India, except for under-trial prisoners in jails and indoor patients of hospitals, nursing homes, floating population without normal residence, foreign nationals, persons residing in barracks of military and paramilitary forces(not cilivian population who reside there), orphanages, rescue homes, ashrams and vagrant houses are excluded.
De jure or de facto	De jure
Census/survey day	July 2004 to June 2005
Field work period	One-year period from July 1st, 2004 to June 30th, 2005. Field work was spread out uniformly over different weeks or months within each of the three-month subround periods.
Questionnaire	A single form that consists of 9 sections on characteristics of sample households and household members
Type of fieldwork	Direct interview
Microdata sample characteristics
Sample design	Two-staged, stratified systematic samples drawn by the country. Stage 1: In rural sector, regions are stratified based on population and crop pattern. Census villages (primary sampling units) are selected from region strata circular systematically with probability proportional to population. In urban sector, districts are stratified by population. Urban frame survey (UFS) blocks are the primary sampling units and selected from district strata circular systematically with equal probability. Stage 2: Selected large villages/blocks are split into hamlet-groups (rural) or sub-blocks (urban), some of which are randomly selected and they form the strata for Stage II, together with small villages/blocks selected in Stage I. Households are selected from those Stage II strata by circular systematically with a random start. Affluent households are over-sampled. The ratio of affluent to other households is 2:8 in rural/urban sector.
Sample fraction	.06%
Sample size (person records)	602833
Sample weights	Weights calculated based on probability of selection at both levels
Units identified in microdata
Dwellings	Yes
Vacant units	No
Households	Yes
Collective dwellings	No
Smallest geography	District
Unit definitions
Dwellings	An accommodation availed of by a household for its residential purpose. It may be an entire structure or a part thereof or consisting of more than one structure.
Households	A group of persons normally living together and taking food from a common kitchen.

Census/survey characteristics
Type	Employment survey
Title	Socio-Economic Survey, Household Schedule 10: Employment and Unemployment, July, 2009-June, 2010
Statistical agency	National Sample Survey Organization, Minstry of Statistics and Program Implementation, Government of India
Population universe	All population in India, except for under-trial prisoners in jails and indoor patients of hospitals, nursing homes, floating population without normal residence, foreign nationals, persons residing in barracks of military and paramilitary forces(not cilivian population who reside there), orphanages, rescue homes, ashrams and vagrant houses are excluded.
De jure or de facto	De jure
Census/survey day	July 1, 2009
Field work period	One-year period from July 1st, 2009 to June 30th, 2010. Field work will be spread out uniformly over different weeks or months within each of the three-month subround periods.
Questionnaire	A single form that consists of 9 sections on characteristics of sample households and household members
Type of fieldwork	Direct interview
Microdata sample characteristics
Sample design	A stratified multi-stage design which includes a first round of the 2001 census villages in the rural sector and Urban Frame Survey blocks in the urban sector. The ultimate stage contains households in both the sectors. In cases of large first stage units, one intermediate stage of sampling involved selelction of two hamlet-groups/ sub-blocks from each rural/urban first stage unit.
Sample fraction	0.0004
Sample size (person records)	560741
Sample weights	Weights calculated based on probability of selection at both levels
Units identified in microdata
Dwellings	Yes
Vacant units	No
Households	Yes
Collective dwellings	Yes
Smallest geography	District
Unit definitions
Dwellings	An accommodation availed of by a household for its residential purpose. It may be an entire structure or a part thereof or consisting of more than one structure.
Households	Every structure, tent, shelter, etc. is a house irrespective of its use. It may be used for residential or non-residential purpose or both, or even may be vacant.
Collective dwellings	A group of persons normally living together and taking food from a common kitchen.Household membership includes temperary stay-aways, but excludes temproary visitors and guests.

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Sample characteristics: India

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