India - Unorganised Manufacturing Enterprises Survey [List Frame], July 2005 - June 2006, NSS 62nd Round

Outline of sample design: Two frames were used for the 62nd round survey viz. List frame and Area frame.
List frame: This was used only for urban sector and that too for selection of manufacturing enterprises only. For unorganised manufacturing enterprises, a list of about 8000 big non-ASI manufacturing units in the urban sector prepared on the basis of the data of the census of manufacturing enterprises conducted by Development Commissioners of Small Scale Industries (DCSSI) in 2003 was used as list frame.

The 'big' DCSSI units in the urban sector had been identified by the criteria given below:

(1) From the list of registered SSI units, units not registered under sections 2m(i) or 2m(ii) of Factories Act, 1948 and belonging to NIC '98 codes 01405, 15 - 37 were considered.

(2) Out of the above units, the units whose gross value of output in 2001 were more than 6 times the average output (Rs. 14,32,314) of all urban SSI units were separated out.

(3) From the above units, those with 6 or more workers were identified as the big units for list frame. About 8000 such units constituted the list frame.

All these units in the list frame were to be surveyed and there was not any sampling for list frame. To avoid duplication, these units were excluded from the list of enterprises prepared in the selected urban blocks/villages drawn from the area frame. There was no sub-round restriction for the list frame units.

All the enterprises in the list frame are common to both central and state samples.


There was no deviation from the original sample deviation.


Out of 8,000 enterprises selected from the list frame, data could be collected from only 2,260 enterprises Thus a large percentage (72%) of the list frame enterprises became casualties. Among the enterprises which were treated as casualties, the majority (around 70%) actually belonged to the category of “Government/public sector undertaking/ASI units”, which were not under the coverage of 62nd round. Another 18% of the enterprises were found to be either non-operative or not traceable.


Weights (or multipliers) are given at the end of each record. Wgt_ss is the variable for sub-sample-wise estimates and Wgt_combined for combined sub-sample estimates.

For generating subsample-wise estimates based on data of all subrounds taken together, either Subsample-1 enterpeises or Subsample-2 enterprises are to be considered at one time. Subsample code is available in the data file.

For generating subsample-combined estimates based on data of all subrounds taken together all enterprises are to be considered.