# How to calculate power of study?

Is there a difference between sample size calculation and power of study calculation?

Kindly discuss and share your expert opinion.

Kindly discuss and share your expert opinion.

Kindly discuss and share your expert opinion.

## All Answers (8)

Radoslaw Lenarczyk· Śląskie Centrum Chorób SercaSai Kishore· Chettinad Hospital & Research InstituteThanks for your nice comment Mr. Lenarczyk. I am keen to know how much of minimal effect can be obtained and how it benefits the research?

Kathleen Bombach· El Paso Community CollegeSai Kishore· Chettinad Hospital & Research InstituteThanks Ms. Bombach. Yes, I do agree that large samples provide better significant result. In order to achieve the same with a smaller sample, (as per the last sentence of your valuable comment) do you suggest a pilot study first? And based on which the sample size can be sorted out and then the rest.

Kathleen Bombach· El Paso Community CollegeThere are multiple considerations that go into designing a study; some are based on statistical measures of effect size, sample size, and power, while others are based on expense, difficulty of obtaining samples/subjects, or importance of potential outcomes.

Sai Kishore· Chettinad Hospital & Research InstituteI understand. Thanks once again Ms. Kathleen. Now this makes me keen enough to ask for more. Calculating the power of study should have a method to calculate. Does this method applies to all the studies, irrespective of whether it is a descriptive or a meta-analysis or cross sectional?

If so, then does doing a pilot also require its power to be calculated?

Balasubramanian Sundaram· Shaqra UniversitySai Kishore· Chettinad Hospital & Research InstituteThank you Bala Sir.

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