Quadrat Sampling: Application with Advantages and Disadvantages

Quadrat sampling is a classic tool for the study of ecology, especially biodiversity. It is an important method by which organisms in a certain proportion (sample) of the habitat are counted directly.  It is used to estimate population abundance (number), density, frequency and distributions. The quadrat method has been widely used in plant studies. A […]

Purposive sampling: Definition, application, advantages and disadvantages

Purposive sampling also knows as judgmental, selective, or subjective sampling, reflects group of  sampling techniques that rely on the judgment of the researcher. This sampling procedure is always prefer the choice of the researcher. Judgmental sampling is completely opposite of probability sampling such as simple random sampling, stratified sampling, systematic sampling, cluster sampling, multi-stage sampling. So […]

Quota sampling: Difition, application, advantages and disadvantages

Quota sampling is a non-probability sampling technique where in the assembled sample has the same proportions of individuals as the entire population with respect to known characteristics, traits, or focused phenomenon. This sampling procedure is completely opposite to probability sampling.   Example of Quota sampling Suppose that you are required to conduct a survey regarding […]

Snowball sampling: Definition, application , advantages and disadvantages

Snowball sampling is an important non-probability sampling where a chain referrel exist. A researcher first select a respondent to collect data then this respondent refers one or more respondent and in this chain everyone refer one or more respondent until the requirements of the researcher fulfilled. Snowball sampling Snowball sampling is a chain referral sampling. […]