Master Samples


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Master Samples

A master sample is one from which repeated sub-samples can be taken as and when required from the same area or population This was first used in the United States when the US Master sample of agriculture was taken In this sampling, the rural area of over 3000 US counties was divided into segments of about four farms each “After selecting a systematic sample of 1/8 of the segments, the materials were duplicated and made available, with instruction, at low cost” The crucial point to note in respect of master samples is that “the actual sample for each new survey is not selected directly from the entire population but from a frame of segments and dwellings that was selected earlier from the entire population ”

 

The utility of the samples is limited to a relatively short period for there may be changes in the population which would distort the representative character of the master samples In view of this, master samples should be relatively permanent, say, dwellings rather than individuals or household which frequently undergo changes on account of births, deaths and migration The main advantage of master samples is that they can be expeditiously selected on account of their simplicity Another advantage is that they are economical, because the same master frame is used for drawing samples for several surveys, as a result of which the cost incurred on the preparation of the master frame is spread over these surveys. Further, on account of this economy in each survey, one can initially spend more to create a good master frame. Thus, economy may lead to improved quality in the listing.


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