Dodowa Health Research Centre
Question
Asked 13th Feb, 2018
How to calculate Sample size for case-control study?
How to calculate Sample size for different types of studies?
Most recent answer
If my cases from the register is 1600. How do I calculate sample size for piloting and validating a screening questionnaire.
Popular answers (1)
Istanbul Medipol University
In case control studies, we usually calculate the odds ratio, if you are also planning to do so, your required sample size can be calculated by just putting in the values of Expected proportion exposed in controls and assumed odds ratio into the site above (link given). The values of Expected proportion exposed in controls and assumed odds ratio can be taken from literature, matching your study.
Hope it helps.
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All Answers (13)
Kwame Nkrumah University Of Science and Technology
- Sample size in the case group.
- Represents the desired power (typically .84 for 80% power).
- Represents the desired level of statistical significance (typically 1.96).
- A measure of variability (similar to standard deviation)
- Effect Size (the difference in proportions)
- r=ratio of controls to cases.
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Al-Furat Al-Awsat Technical University
I think the min. sample size statistically is N = 50, especially for time series analysis.
Chaitanya Engineering College
Depends on test that we conduct, selected apparatus and choosen parameters
Shandong University of Technology
Minitab 18 (including previous versions) has a component that deals with this issue. The sample sizes vary in accordance with your desired power and the statistic method that you wish to employ. There are youtube videos that are specifically about this, please check.
University of Lahore
Harry Barton Essel
nicely described but there are some points to be further elaborated please;
What is Desired power?
What is the formula in which these values be putted to calculate the sample size. ample size in the case group.
Istanbul Medipol University
In case control studies, we usually calculate the odds ratio, if you are also planning to do so, your required sample size can be calculated by just putting in the values of Expected proportion exposed in controls and assumed odds ratio into the site above (link given). The values of Expected proportion exposed in controls and assumed odds ratio can be taken from literature, matching your study.
Hope it helps.
16 Recommendations
G. Kuppuswamy Naidu Memorial Hospital
if my cases are 300 and control is 3000 what will be my sample size?
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