The study would have N number of examiners who will be provided with a set of photographs of x number. They will be asked to identify whether the photograph which will depict a corneal ulcer is caused by either fungi, bacteria or a parasite. The response can only be one. How many N examiners will I need so that the study has a power of 80% and alpha of 0.05 that the answers provided are not due to chance? Here it is probably related to Fleiss K which I should take as 0.6. Therefore do I need to find for sample size either Number of examiners, or number of photographs, given categories (K) as 3.
Crimp and Wright (1995) noted that a sample size larger than thirty and less than 500 is often considered to be appropriate for most research methods.
Raqee Najmuldeen Thank you for your response. I agree to your suggestion but need a more specific answer and solution. This, I have learnt one the past few days, is based on Fleiss Kappa score (0.6).
Calculating the sample size for a study involving examiners who will make a clinical diagnosis based on a set of images can be complex and depends on many factors such as the expected prevalence of the condition, the desired level of precision, and the desired level of confidence. There are many online calculators and software tools that can help you calculate the sample size for your study. Some popular tools include G*Power, OpenEpi, and Sample Size Calculator.
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