Sample characteristics: India

Census characteristics

  1983 1987 1993 1999 2004
Title Socio-Economic Survey, Household Schedule 10: Employment and Unemployment, January to December, 1983 Socio-Economic Survey, Household Schedule 10: Employment and Unemployment, July, 1987-June, 1988 Socio-Economic Survey, Household Schedule 10: Employment and Unemployment, July, 1993-June, 1994 Socio-Economic Survey, Household Schedule 10: Employment and Unemployment, July, 1999-June, 2000 Socio-Economic Survey, Household Schedule 10: Employment and Unemployment, July, 2004-June, 2005
Census agency National Sample Survey Organization, Government of India National Sample Survey Organization, Government of India National Sample Survey Organization, Government of India National Sample Survey Organization, Government of India National Sample Survey Organization, Government of India
Population universe Not specified Not specified All population in India, except for foreigners, the homeless, or people in orphanages, rescue homes, ashram, and vagrant houses. 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. 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 De jure De jure De jure De jure
Enumeration unit Household Household Household Household, enterprise Household
Census day January to December 1983 July 1987 to June 1988 July 1993 to June 1994 July 1999 to June 2000 July 2004 to June 2005
Field work period One-year period from January to December, 1983 One-year period from July, 1987 to June, 1988 One-year period from July, 1993 to June, 1994 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 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 period.
Enumeration forms 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. 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. 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. 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. A single form that consists of 9 sections on characteristics of sample households and household members
Type of field work Direct interview Direct interview Direct interview Direct interview Direct interview
Respondent Head of household or somebody else Head of household or somebody else Head of household or somebody else Head of household or somebody else Head of household or somebody else
Coverage --- --- Entire country, in both rural and urban sectors 100% of the Indian Union excepting (1) Ladakh and Kargil districts of Jammu and Kashmir, (2) interior villages of Nagaland situated beyond 5 kms. of a bus route, and (3) villages of Andaman and Nicobar Islands remaining inaccessible throughout the year. Also excluded were all the uninhabited villages according to 1991 census. 100% of the Indian Union excepting (1) Ladakh and Kargil districts of Jammu and Kashmir, (2) interior villages of nagaland situated beyond 5 kms. of a bus route, and (3) villages of Andaman and Nicobar Islands remaining inaccessible throught the year.

Microdata sample characteristics

  1983 1987 1993 1999 2004
Microdata source National Sample Survey Organization, Government of India National Sample Survey Organization, Government of India National Sample Survey Organization, Government of India National Sample Survey Organization, Government of India National Sample Survey Organization, Government of India
Sample design Drawn by the NSSO, details not specified Drawn by the NSSO, details not specified 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. 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. 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 unit Household Household Household Household Household
Sample fraction .09% .09% .07% .07% .06%
Sample size (person records) 623,494 667,848 564,740 596,688 602,833
Sample weights Calculated by the NSSO based on stratified sample design Calculated by the NSSO based on stratified sample design Weights calculated by the NSSO based on probability of selection at both levels Weights calculated by the NSSO based on probability of selection at both levels Weights calculated based on probability of selection at both levels

Units identified

  1983 1987 1993 1999 2004
Dwellings Yes Yes Yes Yes Yes
Vacant units No No No No No
Households Yes Yes Yes Yes Yes
Individuals Yes Yes Yes Yes Yes
Group quarters No No No No No
Indigenous population --- --- --- --- ---
Special populations --- --- Persons without any normal residence, foreign nationals, and people in orphanages, rescue homes, ashram and vagrant houses are not covered by survey. 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. ---
Smallest geography Region Region Region Region Region

Unit definitions

  1983 1987 1993 1999 2004
Dwelling units --- --- --- --- 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.
House --- --- 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. 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. 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.
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. 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. 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. 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. A group of persons normally living together and taking food from a common kitchen.