India - Household Consumer Expenditure Type-1, July 2009 - June 2010, NSS 66th Round

Rural sector: If 'r' be the sample size allocated for a rural stratum, the number of sub-strata formed are 'r/4'. The villages within a district as per frame are first arranged in ascending order of population. Then sub-strata 1 to 'r/4' demarcated in such a way that each sub-stratum is comprise a group of villages of the arranged frame and have more or less equal population.

Urban sector: If 'u' be the sample size for a urban stratum, 'u/4' number of sub-strata are formed. The towns within a district, except those with population 10 lakhs or more and also the non-UFS towns, are first arranged in ascending order of population. Next, UFS blocks of each townis arranged by IV unit no. × block no. in ascending order. From this arranged frame of UFS blocks of all the towns, 'u/4' number of sub-strata are formed in such a way that each sub-stratum have more or less equal number of FSUs.

For towns with population 10 lakhs or more, the urban blocks will be first arranged by IV unit no. × block no. in ascending order. Then 'u/4' number of sub-strata are formed in such a way that each sub-stratum have more or less equal number of blocks.

All non-UFS towns taken together within the district l form one sub-stratum.