Once the research question and the research design have been finalised, it is important to select the appropriate sample for the study. The method by which the researcher selects the sample is the ‘ Sampling Method’. There are essentially two types of sampling methods: 1) probability sampling – based on chance events (such as random numbers, flipping a coin etc.); and 2) non-probability sampling – based on researcher's choice, population that accessible & available. Some of the non-probability sampling methods are: purposive sampling, convenience sampling, or quota sampling. Random sampling method (such as simple random sample or stratified random sample) is a form of probability sampling. It is important to understand the different sampling methods used in clinical studies and mention this method clearly in the manuscript. The researcher should not misrepresent the sampling method in the manuscript (such as using the term ‘ random sample’ when the researcher has used convenience sample). The sampling method will depend on the research question. For instance, the researcher may want to understand an issue in greater detail for one particular population rather than worry about the ‘ generalizability’ of these results. In such a scenario, the researcher may want to use ‘ purposive sampling’ for the study.
[1]
Maher M El-Masri,et al.
Non-probability sampling.
,
2017,
The Canadian nurse.
[2]
E. Faerstein,et al.
A DICTIONARY OF EPIDEMIOLOGY
,
2016
.
[3]
Russell S. Kirby,et al.
Designing Clinical Research
,
2014
.
[4]
G. Williamson.
The A–Z of Social Research: A Dictionary of Key Social Science Research Concepts
,
2004
.
[5]
Douglas D. Heckathorn,et al.
Respondent-driven sampling : A new approach to the study of hidden populations
,
1997
.
[6]
Rajiv Vaidyanathan,et al.
Dictionary of statistics and methodology : #a #nontechnical guide for the social sciences
,
1994
.
[7]
M. El-Masri.
Probability sampling.
,
2017,
The Canadian nurse.
[8]
D. Heckathorn,et al.
SNOWBALL VERSUS RESPONDENT-DRIVEN SAMPLING.
,
2011,
Sociological methodology.
[9]
R. Atkinson,et al.
Accessing Hidden and Hard-to-Reach Populations: Snowball Research Strategies
,
2022
.
[10]
M. Patton.
Qualitative research and evaluation methods
,
1980
.
[11]
William C. Schefler,et al.
Statistics for health professionals
,
1979
.