Non Random Sampling In Research

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1. INTRODUCTION
1.1 SAMPLING
Sampling in simple terms refers to the process in which a researcher chooses her sample for study.
Sampling refers to statistical methods of selection of any individual or relatively smaller number of the relatively larger population to study characteristics of the entire population is used to study characteristics and to draw statistically valid inference about the characteristics of the entire population.
The aim of sampling technique is to provide various types of statistical information of a qualitative nature about the whole by examining a few selected units.
The sampling method is the scientific purpose of selecting those sampling units which would provide the required estimate with associated uncertainty …show more content…

Proportionate stratified sampling.
b. Disproportionate stratified sampling.
3. Mixed sampling
i. Sequentional ii. Systematic

1. Non-random/Delebrate sampling (Purposive or Non probability sampling): In non random sampling, the sample is intentionally or decisively selected without following the theory of probability from the sampling population.
Non probability samplings are used when the number of it is not known or the sample cannot be individually identified. The salient feature of non-random sampling techniques is that sample are selected purely on the subjective judgement, knowledge of the researcher, rather than probability sampling. Some researcher believes that non-random sampling are inferior to random sampling. These are reasons for users of non-probability sampling techniques. Nonrandom sampling require researcher to use their knowledge drawn from theories of literature review and practical (due to experience of research). Another reason of selecting non-random sampling is a procedure used in selection of unit are easier, quicker and cheaper when compared with the random sampling. Non probability sampling, are also aimed for exploratory research where aim is to find out if a problem or in quicker and cheaper …show more content…

Convenience Sample: Convenience sample is a type of non random sampling, where the sample is selected considering the convenience of researchers. It is simply one where the units that are selected for inclusion in the sample is the easiest to access. Convenience sampling is very easy to carry out, relatively cost effective and less time consuming and it can help in gathering some useful information that may not be feasible to collect by probability sampling. Convenience sampling are sometimes biased. Convenience sampling should be treated with caution, its low cost and ease of use makes it the preferred choice for a significant number of researchers.

2. Judgmental Sampling: also known as purposive or biased sampling. In this sampling judgement of the researcher is used for selecting sample. The main aim of purposive sampling is to focus on particular characteristics of a population of interest, which will better enable you to answer your research questions
E.g. A fruit vender want to show particular fruit is fresh, he will select sample from particular fruit stock which will be containing fresh fruits.
3. Accidental sampling: Sampling is based upon convenience in accessing the sample population.

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