India - Trade Survey: NSS 46th Round, Schedule 2.41.2, July -June 1990-91

No documents on sample design is avaialble. However, Multiplier has been computed and posted in each record of the data set for Sub-sample and combined.

Generally, a stratified two or three-stage sampling design is adopted for the enterprise surveys in India. The first-stage units (FSUs) are the villages and urban blocks. The ultimate-stage sampling units are the enterprises. If the sample FSUs are large in size (in terms of population and/or number of non-agricultural enterprises), they are segmented into a certain number of segments4. Total number of segments formed in the sample FSU depends on the size of the FSU - the larger the size, larger is the value of total number of segments formed in the FSU. From the segments formed in the sample FSU, a sample of segments is selected for listing of enterprises. Thus, for larger FSUs, the sampling design becomes three-stage with sampling units in the second and third (i.e. ultimate) stages being the segments and enterprises respectively.

For selection of the FSUs in the enterprise surveys, generally Economic Census (EC) frame giving count of enterprises and workers at the FSU level is used as the sampling frame. However, if it becomes difficult to identify the urban blocks as per the EC frame based on the available maps, the NSSO's list of Urban Frame Survey Blocks is used as the sampling frame for selection of urban blocks.

For the purpose of sampling of enterprises, a list of enterprises is prepared within each selected FSU (or sample segments in case of large FSU). For listing of enterprises, a combination of household cum site approach is adopted in the surveys. The enterprises having fixed premises are listed at their sites. But the entrepreneurial activities carried out without fixed premises or within the premises of the households are listed as enterprises against the households of the owners. From the frame of enterprises so prepared, a sample of enterprises is selected circular systematically after grouping the enterprises into a few strata to ensure representation of different types of units in the sample.

There was no deviation from the original sampling design

WGT- Multiplier has been provided for sub-sample and combined. This should be used as multiplier factor for Sub sample and Combined sample.