India - Annual Survey of Industries 1996-97

Sampling Procedure

The sampling design followed in ASI 1996-97 is a circular systematic one. All the factories in the updated frame (universe) are divided into two sectors, viz., Census and Sample.

a) CENSUS : To keep pace with the enormous growth of the factory sector, definition of the census sector was changed from ASI 1987-88 to the units having 100 or more workers irrespective of their operation with or without power and all electrical undertakings. All industrial units belonging to the 12 less industrially developed states/ UT's viz. Manipur, Meghalaya, Nagaland, Tripura, Sikkim and Andaman & Nicobar Islands etc.
b) The rest of of the universe was covered on sampling basis so as to cover all the units in a span of three years. In any stratum, if the number of units was less than 20, then the entire stratum was enumearted completely along with census factories. In any stratum if no. of unit is between 21 & 60, a minimum sample of size 20 was selected by Circular Systematic Sampling. For all other units a uniform sampling fraction of 1/3 was adopted.


There was no deviation from sample design in ASI 1996-97.


Please note that an inflation factor (Multiplier) WGT is available for each unit against records for ASI 1996-97 data. The multiplier is calculated for each stratum (i.e. State X NIC-04 (4 Digit) after adjusting for non-response cases.

HOWEVER, IT IS TO BE NOTED THAT ALL THE INDUSTRIES (RECORDS) ARE ALREADY WEIGHTED BY MULTIPLIER FACTOR WGT. THERFORE NO NEED TO USE THE WGT.