D annan a simple guide to resarch writing indd

Judgmental sampling
 
Judgmental sampling is a type of a purposive sampling. Purposive sampling, thus, is a 
conventional term used to depict any sample intentionally picked by the specialist in 
accordance with predetermined non-probability criteria.
For instance, in an investigation of artificial intelligence trends, the specialist might need to 
meet just those with a genuinely wide involvement in the field. When it is used in the 
beginning of an exploratory or descriptive examination, it serves as a powerful time- 
proficient strategy.
Quota sampling
 
Quota sampling is another purposive approach available to the researcher. The study may 
require a sample of certain variables but for some valid reason proportional sampling is 
not possible. In this situation, quota sampling may be an appropriate choice to improve the 
representativeness of the study.

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• The population is divided proportionately into predetermined categories.
• The subject category is deliberately selected from the population until a particular 
quota is met for each category.
Two basic conditions:
• Firstly, the categories should have a distribution in the population that can be 
estimated, and
• Secondly, the variable used in forming each category must be relevant to the topic 
of the study.
For example, in a study of the buying patterns of young executives working in the government
institutions in Astana, the following categories can be identified for quota sampling:
• Gender: 2 categories – male, female
• Marital status: 3 categories – married, single, divorced
• Family social economic class: 3 categories – upper, middle, lower
• Educational qualification: 4 categories – postgraduates, undergraduates with
diplomas, high school diploma, non-high school diploma.
From the combination above, the researcher will proceed to locate subjects who fall into 
each category in terms of an estimate of their occurrence in the population.