INDIA - Comprehensive Annual Modular Survey (CAMS),NSS 79th round: 2022-23

Sample Design

Formation of sub-units (SUs):
Rural areas: A rural village will be notionally divided into a number of sub-units (SU)
of more or less equal population during the preparation of frame. Census 2011 population of
villages will be projected by applying suitable growth rates and the number of SUs to be
formed in a village will be determined apriori.

The above procedure of SU formation will be implemented in the villages with
population more than or equal to 1000 as per Census 2011. In the remaining villages, no SU
will be formed.

The number of SUs to be formed in the villages (with Census 2011 population 1000 or
more) of the frame will be decided before selection of the samples following the criteria given
below:
projected population of the village no. of SUs to be formed
less than 1200 1
1200 to 2399 2
2400 to 3599 3
3600 to 4799 4
4800 to 5999 5
.......and so on ....

Special case:
For rural areas of (i) Himachal Pradesh, (ii) Sikkim, (iii) Andaman & Nicobar
Islands, (iv) Uttarakhand (except four districts Dehradun, Nainital, Hardwar and Udham Singh
Nagar), (v) Punch, Rajouri, Udhampur, Reasi, Doda, Kishtwar, Ramban of Jammu and
Kashmir (vi) Leh and Kargil districts of Ladakh region and (vii) Idukki district of Kerala,
numbers of SUs to be formed in a village will be determined in such a way that each SU
contains 600 or less projected population. Further, SUs will not be formed in the villages in
the above mentioned districts/States with population less than 500 as per Census 2011. In the
remaining villages the number of SUs to be formed for these States/districts will be as follows:
projected population of the village no. of SUs to be formed
less than 600 1
600 to 1199 2
1200 to 1799 3
1800 to 2399 4
2400 to 2999 5
.......and so on ....

Urban areas: SUs will be formed in urban sector also. The procedure will be similar
to that adopted in rural areas except that SUs will be formed on the basis of households in the UFS frame instead of population, since UFS frame does not have population. Each UFS block with number of households more than or equal to 250 will be divided into a number of SUs. In the remaining UFS blocks, no SU will be formed.

The number of SUs to be formed in the UFS blocks of the frame will be decided before
selection of the samples following the criteria given below:
number of households of the UFS block no. of SUs to be formed
less than 250 1
250 to 499 2
500 to 749 3
750 to 999 4
1000 to 1249 5
.......and so on ....

Stratification of FSUs:
Rural Sector:
A Special Rural stratum, at all-India level, will be formed comprising all the uninhabited villages as per census 2011 belonging to all States/UT.
For the remaining villages which are inhabited as per census 2011, districts will be basic geographical unit for stratum formation. Within each district, two Stratum will be formed:
(a) The villages (i) within a distance of 5 Kms from the district headquarter or (ii) within a distance of 5 Kms from a city/town with more than 5 lakh population, will form a stratum (stratum 1). The information will be obtained from the village directory of census 2011. It will be the stratum 1 for a particular district.
(b) Rest of the villages will constitute another stratum (stratum 2) of the particular district.

Urban Sector:
Two or more strata will be formed in urban areas of each district:
(i) each million plus city as per census 2011 will constitute separate stratum .
Stratum no will be 01, 02, 03....,19
(ii) rest of the urban areas of the district. Stratum no will be 20.


As per NITI AYOG list, at present there are 114 aspirational districts in the rural area and 112 in the urban areas. Socio economic
upliftment of these districts is of prime interest of the Government. With a view to generate estimates for theses aspirational districts, all aspirational districts and larger districts in rural India will get allocation of 20 FSUs with the allocation for other districts will be a minimum
of 4 FSUs. In Urban areas, all aspirational districts will get allocation 20 FSUs and districts having million plus towns will get at least 20 FSU allocations. For other districts 4 FSUs will be allocated.