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Sample Size

January 26th, 2010 admin Leave a comment Go to comments

Sample Size
How do I calculate the sample size and effect if the odds ratio is known?

A previous study showed an odds ratio of 3.53 between control and experimental groups. I am trying now to estimate the necessary sample size for a subsequent randomized control trials studying the same intervention. I am at a complete loss! How do I calculate the effect size and how I get from that the required sample size? Any help will be much appreciated!

* General rule for regfression: for 1 variable to be 20 data. ** General rule for any scale were used, sample size ~ = ((ZS) / h) ^ 2, Z :1-alpha, P = st.deviation, h = error tolerance (e = 2)

sample size: Proportion Part 1


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