Sample size and its importance in research

• Main Author: Chittaranjan Andrade
• Format: Article
• Language: English
• Published: SAGE Publishing 2020-01-01
• Series: Indian Journal of Psychological Medicine
• Subjects: ethics; primary hypothesis; research methodology; sample size; secondary hypothesisize; statistical power
• Online Access: http://www.ijpm.info/article.asp?issn=0253-7176;year=2020;volume=42;issue=1;spage=102;epage=103;aulast=Andrade

The sample size for a study needs to be estimated at the time the study is proposed; too large a sample is unnecessary and unethical, and too small a sample is unscientific and also unethical. The necessary sample size can be calculated, using statistical software, based on certain assumptions. If no assumptions can be made, then an arbitrary sample size is set for a pilot study. This article discusses sample size and how it relates to matters such as ethics, statistical power, the primary and secondary hypotheses in a study, and findings from larger vs. smaller samples.