Systematic sampling and cluster sampling

Jayasankar, J (2015) Systematic sampling and cluster sampling. In: Training Manual Fish Stock Assessment and Management. ICAR- Central Marine Fisheries Research Institute, Kochi, pp. 36-41. ISBN 978-93-82263-07-4

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Abstract

The sampling methods which are more popular and usually precede a discussion on Systematic sampling basically involve the methodology of selection of successive units with the help of random numbers. But there are situations where only the first unit is selected at random and the rest all the other units get selected automaticallythereafter. This method is called systematic sampling. As the entire sample is selected based on one unit, the mode of selection is based on a pattern. Such pattern involves regular spacing of units either spatially or temporally whose first occurrence is amenable to selection randomly. Suppose a population contains N units serially numbered from 1 to N and suppose further that N is expressible as a product of two integers k and n so that N=kn. Draw a random number less than k, say i, and select the unit with corresponding serial number and every kth unit in the population thereafter. Obviously the sample will contain the n units i,i + k, i+2k, ..., i+(n-1)k and is known as a systematic sample.

Item Type:	Book Section
Uncontrolled Keywords:	Sampling; statistics
Subjects:	Statistical Designs
Divisions:	CMFRI-Kochi > Marine Capture > Fishery Resources Assessment, Economics and Extension Division Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Fishery Resources Assessment, Economics and Extension Division CMFRI-Kochi > Marine Capture > Fishery Resources Assessment, Economics and Extension Division Subject Area > CMFRI-Kochi > Marine Capture > Fishery Resources Assessment, Economics and Extension Division
Depositing User:	Arun Surendran
Date Deposited:	05 Aug 2024 05:47
Last Modified:	05 Aug 2024 05:47
URI:	http://eprints.cmfri.org.in/id/eprint/18671

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