India - Informal Non-Agricultural Enterprises Survey: NSS 55th Round : July 1999 - June 2000

General: A stratified sampling design has been adopted for selection of the sample first-stage units (FSUs). The FSUs are villages (panchayat wards for Kerala) for rural areas and Urban Frame Survey (UFS) blocks for urban areas. The Ultimate stage units (USUs) are enterprises for canvassing informal sector enterprise schedule. USUs are selected by the method of circular
systematic sampling from the corresponding frame in the FSU. Large FSUs are subdivided into hamlet groups (rural) / sub-blocks (urban) that are grouped into two segments, and USUs are selected independently from each of these segments.

Sample size (FSUs): A total number of 10,384 FSUs were selected for survey in the central sample at all-India level (rural & urban combined) in the 55th round. Sample size for the whole round for each State/UT and Sector (i.e. rural/ urban) are allocated equally among the four sub-rounds. Sample FSUs for each sub-round are selected afresh in the form of two independent sub-
samples. Out of the 10384 FSUs selected for the survey, 10170 were actually surveyed. This comprises of 6046 villages and 4124 urban blocks.

Stratification of enterprises:All the eligible informal non-agricultural enterprises (other than mining & quarrying and electricity, gas & water supply which operated at least 30 days (15 days for seasonal enterprises) during the last year in a segment (both rural & urban) are stratified into 12 strata by jointly considering their broad industry group and enterprise class. Eligible enterprises could belong to any of the 6 broad industry groups, viz. manufacturing - 1, construction - 2, trade & repair services - 3, hotels & restaurants - 4, transport, storage & communication - 5 and other service sector - 6. The enterprises are classified into two enterprise classes. Enterprise class of an enterprise is '1' for Own Account Enterprises. Enterprise class for Establishments is '2'. Thus there are 12 possible strata of various combinations of broad industry groups and enterprise classes.

General procedure of selection of enterprises:Sample enterprises are selected by circular systematic sampling with equal probability. Enterprises under each stratum (i.e. segment x broad industry group x enterprise class) are arranged in the ascending order of NIC 2-digit codes (3-digit codes for hotels & restaurants) before sampling.

There was no deviation from the original sampling design

A total number of 10,384 FSUs were selected for survey in the central sample at all-India level (rural & urban combined) in the 55th round. Sample size for the whole round for each State/UT and Sector (i.e. rural/ urban) are allocated equally among the four sub-
rounds. Sample FSUs for each sub-round are selected afresh in the form of two independent sub-samples. Out of the 10384 FSUs selected for the survey, 10170 were actually surveyed. This comprises of 6046 villages and 4124 urban blocks.
Total data is distributed in 8 sub-samples,there being 2 sub-samples in each sub-round (1,2,3,4)
Multipliers(Weight) are given sub-round wise for each sub-round(Variable- WGT).
For annual tabulation use simple average of 4 sub-rounds.
First, get sub-round specific combined multiplier (variable-WGT Combined) estimates.Then apply a common divisor of 4 to get average of 4 sub-rounds