Programme: Master of Library & Information Science
Course: MLIS-09: Research Methodology
Target group: Master's students & Research Scholars
There are different methods used to draw a sample from a given population. These methods are broadly classified into two categories namely –
1. Probability
Sampling
2. Non-Probability
Sampling
Probability sampling is a scientific method of
selecting the sample units. Probability sampling will help the researcher to
find out the chances of sampling units being included in the sample. Simple
Random sampling, systematic sampling, Stratified Sampling, cluster sampling and
multi-stage sampling are popularly used methods of probability sampling.
Non-probability sampling is based on the personal judgement of the researcher. In this method a desired number of sample units are selected based on the object of inquiry so that the important items representing the true characteristics of the population are included in the sample. Purposive sampling, Quota sample and convenience sampling are the methods of non probability sampling.